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Pfam 22.0 ::
Browse Families - A
Browse available alignments and models |
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Available sections: Numbers A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Top twenty families
| A | |||||||
| Name | acc number | #seed | #full | av. len | av. %id | structure | Description |
|---|---|---|---|---|---|---|---|
| A-2_8-polyST | PF07388 | 3 | 19 | 271 aa | 44% |   | Alpha-2,8-polysialyltransferase (POLYST) |
| A1_Propeptide | PF07966 | 85 | 304 | 28 aa | 35% |   | A1 Propeptide |
| A2L_zn_ribbon | PF08792 | 14 | 49 | 32 aa | 50% |   | A2L zinc ribbon domain |
| A2M | PF00207 | 57 | 347 | 93 aa | 37% | 1c3d | Alpha-2-macroglobulin family |
| A2M_comp | PF07678 | 56 | 393 | 211 aa | 38% | 1bv8 | A-macroglobulin complement component |
| A2M_N | PF01835 | 53 | 506 | 264 aa | 20% | 1c3d | Alpha-2-macroglobulin family N-terminal region |
| A2M_N_2 | PF07703 | 70 | 462 | 143 aa | 22% |   | Alpha-2-macroglobulin family N-terminal region |
| A2M_recep | PF07677 | 51 | 325 | 89 aa | 36% | 1bv8 | A-macroglobulin receptor |
| A4_EXTRA | PF02177 | 5 | 98 | 152 aa | 63% | 1mwp | Amyloid A4 extracellular domain |
| AAA | PF00004 | 229 | 9438 | 166 aa | 24% | 1nsf | ATPase family associated with various cellular activities (AAA) |
| AAA_2 | PF07724 | 141 | 3294 | 156 aa | 34% | 1nsf | ATPase family associated with various cellular activities (AAA) |
| AAA_3 | PF07726 | 55 | 768 | 123 aa | 53% | 1nsf | ATPase family associated with various cellular activities (AAA) |
| AAA_4 | PF04326 | 65 | 390 | 95 aa | 20% |   | Divergent AAA domain |
| AAA_5 | PF07728 | 35 | 1886 | 129 aa | 21% | 1nsf | ATPase family associated with various cellular activities (AAA) |
| AAA_PrkA | PF08298 | 7 | 193 | 353 aa | 51% |   | PrkA AAA domain |
| AalphaY_MDB | PF04611 | 5 | 5 | 147 aa | 47% |   | Mating type protein A alpha Y mating type dependent binding region |
| AAL_decarboxy | PF03306 | 8 | 157 | 214 aa | 36% |   | Alpha-acetolactate decarboxylase |
| AAR2 | PF05282 | 5 | 58 | 312 aa | 29% |   | AAR2 protein |
| AARP2CN | PF08142 | 29 | 134 | 81 aa | 34% |   | AARP2CN (NUC121) domain |
| AAT | PF03417 | 18 | 116 | 217 aa | 22% |   | Acyl-coenzyme A:6-aminopenicillanic acid acyl-transferase |
| AATase | PF07247 | 10 | 61 | 455 aa | 18% |   | Alcohol acetyltransferase |
| AA_kinase | PF00696 | 107 | 3205 | 237 aa | 19% | 1e19 | Amino acid kinase family |
| AA_permease | PF00324 | 27 | 4898 | 355 aa | 18% |   | Amino acid permease |
| AA_permease_N | PF08403 | 7 | 52 | 64 aa | 47% |   | Amino acid permease N-terminal |
| Aa_trans | PF01490 | 26 | 1285 | 330 aa | 17% |   | Transmembrane amino acid transporter protein |
| ABA_WDS | PF02496 | 18 | 83 | 73 aa | 71% |   | ABA/WDS induced protein |
| ABC-3 | PF00950 | 16 | 904 | 252 aa | 28% |   | ABC 3 transport family |
| ABC1 | PF03109 | 32 | 938 | 120 aa | 32% |   | ABC1 family |
| ABC2_membrane | PF01061 | 303 | 3905 | 195 aa | 14% |   | ABC-2 type transporter |
| ABC_membrane | PF00664 | 70 | 6419 | 257 aa | 14% | 1pf4 | ABC transporter transmembrane region |
| ABC_membrane_2 | PF06472 | 26 | 338 | 268 aa | 23% |   | ABC transporter transmembrane region 2 |
| ABC_sub_bind | PF04392 | 9 | 211 | 279 aa | 33% |   | ABC transporter substrate binding protein |
| ABC_tran | PF00005 | 64 | 47590 | 185 aa | 26% | 1b0u | ABC transporter |
| AbfB | PF05270 | 11 | 48 | 136 aa | 41% |   | Alpha-L-arabinofuranosidase B (ABFB) |
| ABG_transport | PF03806 | 9 | 140 | 468 aa | 43% |   | AbgT putative transporter family |
| Abhydrolase_1 | PF00561 | 48 | 9801 | 174 aa | 17% | 1ede | alpha/beta hydrolase fold |
| Abhydrolase_2 | PF02230 | 14 | 630 | 204 aa | 22% | 1auo | Phospholipase/Carboxylesterase |
| Abhydrolase_3 | PF07859 | 133 | 1618 | 193 aa | 28% |   | alpha/beta hydrolase fold |
| Abhydrolase_4 | PF08386 | 38 | 185 | 102 aa | 25% |   | TAP-like protein |
| Abhydro_lipase | PF04083 | 13 | 251 | 68 aa | 34% | 1hlg | ab-hydrolase associated lipase region |
| Abi | PF02517 | 46 | 1406 | 96 aa | 22% |   | CAAX amino terminal protease family |
| Abi_2 | PF07751 | 19 | 93 | 212 aa | 23% |   | Abi-like protein |
| Abi_HHR | PF07815 | 6 | 57 | 74 aa | 65% |   | Abl-interactor HHR |
| ABM | PF03992 | 116 | 1129 | 63 aa | 18% | 1n5t | Antibiotic biosynthesis monooxygenase |
| Abp2 | PF09441 | 5 | 11 | 169 aa | 58% |   | ARS binding protein 2 |
| ACBP | PF00887 | 14 | 358 | 79 aa | 37% | 1aca | Acyl CoA binding protein |
| ACCA | PF03255 | 15 | 465 | 137 aa | 49% |   | Acetyl co-enzyme A carboxylase carboxyltransferase alpha subunit |
| ACC_central | PF08326 | 20 | 120 | 589 aa | 33% |   | Acetyl-CoA carboxylase, central region |
| AceK | PF06315 | 5 | 94 | 553 aa | 46% |   | Isocitrate dehydrogenase kinase/phosphatase (AceK) |
| Acetate_kinase | PF00871 | 12 | 729 | 341 aa | 38% | 1g99 | Acetokinase family |
| AcetDehyd-dimer | PF09290 | 37 | 169 | 144 aa | 62% | 1nvm | Prokaryotic acetaldehyde dehydrogenase, dimerisation |
| Acetone_carb_G | PF08882 | 9 | 37 | 107 aa | 44% |   | Acetone carboxylase gamma subunit |
| AcetylCoA_hydro | PF02550 | 5 | 306 | 198 aa | 26% |   | Acetyl-CoA hydrolase/transferase N-terminal domain |
| Acetyltransf_1 | PF00583 | 243 | 13427 | 82 aa | 18% | 1bo4 | Acetyltransferase (GNAT) family |
| Acetyltransf_2 | PF00797 | 33 | 260 | 236 aa | 26% | 1e2t | N-acetyltransferase |
| AChE_tetra | PF08674 | 7 | 37 | 37 aa | 70% |   | Acetylcholinesterase tetramerisation domain |
| Acid_phosphat_A | PF00328 | 96 | 747 | 345 aa | 18% | 1rpa | Histidine acid phosphatase |
| Acid_phosphat_B | PF03767 | 31 | 213 | 191 aa | 24% | 1n9k | HAD superfamily, subfamily IIIB (Acid phosphatase) |
| ACN9 | PF05882 | 5 | 44 | 92 aa | 41% |   | ACN9 family |
| Aconitase | PF00330 | 11 | 1659 | 449 aa | 32% | 1aco | Aconitase family (aconitate hydratase) |
| Aconitase_2_N | PF06434 | 12 | 253 | 350 aa | 60% | 1l5j | Aconitate hydratase 2 N-terminus |
| Aconitase_C | PF00694 | 18 | 1372 | 115 aa | 36% | 1aco | Aconitase C-terminal domain |
| ACOX | PF01756 | 40 | 214 | 176 aa | 23% | 1is2 | Acyl-CoA oxidase |
| Acp26Ab | PF05777 | 4 | 14 | 90 aa | 94% |   | Drosophila accessory gland-specific peptide 26Ab (Acp26Ab) |
| ACP53EA | PF06313 | 2 | 25 | 116 aa | 52% |   | Drosophila ACP53EA protein |
| ACPS | PF01648 | 43 | 1009 | 66 aa | 27% | 1qr0 | 4'-phosphopantetheinyl transferase superfamily |
| ACP_syn_III | PF08545 | 170 | 956 | 77 aa | 37% |   | 3-Oxoacyl-[acyl-carrier-protein (ACP)] synthase III |
| ACP_syn_III_C | PF08541 | 187 | 1070 | 89 aa | 32% |   | 3-Oxoacyl-[acyl-carrier-protein (ACP)] synthase III C terminal |
| ACR_tran | PF00873 | 16 | 2961 | 966 aa | 26% | 1oy6 | AcrB/AcrD/AcrF family |
| ACT | PF01842 | 180 | 5921 | 64 aa | 16% | 1psd | ACT domain |
| Act-Frag_cataly | PF09192 | 7 | 15 | 284 aa | 29% | 1cja | Actin-fragmin kinase, catalytic |
| ActA | PF05058 | 6 | 725 | 209 aa | 50% |   | ActA Protein |
| ACTH_domain | PF00976 | 2 | 287 | 38 aa | 80% |   | Corticotropin ACTH domain |
| Actin | PF00022 | 30 | 4720 | 225 aa | 54% | 2btf | Actin |
| Activin_recp | PF01064 | 29 | 226 | 82 aa | 25% | 1tbi | Activin types I and II receptor domain |
| Acyl-ACP_TE | PF01643 | 30 | 191 | 236 aa | 30% |   | Acyl-ACP thioesterase |
| Acyl-CoA_dh_1 | PF00441 | 60 | 5125 | 145 aa | 25% | 1buc | Acyl-CoA dehydrogenase, C-terminal domain |
| Acyl-CoA_dh_2 | PF08028 | 38 | 513 | 133 aa | 23% |   | Acyl-CoA dehydrogenase, C-terminal domain |
| Acyl-CoA_dh_M | PF02770 | 497 | 4843 | 52 aa | 36% | 1buc | Acyl-CoA dehydrogenase, middle domain |
| Acyl-CoA_dh_N | PF02771 | 10 | 3043 | 99 aa | 27% | 1buc | Acyl-CoA dehydrogenase, N-terminal domain |
| Acylphosphatase | PF00708 | 5 | 645 | 74 aa | 37% | 1aps | Acylphosphatase |
| Acyltransferase | PF01553 | 58 | 2622 | 128 aa | 21% | 1k30 | Acyltransferase |
| Acyl_CoA_thio | PF02551 | 9 | 661 | 113 aa | 28% | 1c8u | Acyl-CoA thioesterase |
| Acyl_transf_1 | PF00698 | 13 | 2803 | 264 aa | 30% | 1mla | Acyl transferase domain |
| Acyl_transf_2 | PF02273 | 4 | 17 | 291 aa | 70% | 1tht | Acyl transferase |
| Acyl_transf_3 | PF01757 | 62 | 1464 | 333 aa | 17% |   | Acyltransferase family |
| ADAM_CR | PF08516 | 70 | 305 | 110 aa | 33% |   | ADAM cysteine-rich |
| ADAM_spacer1 | PF05986 | 23 | 161 | 109 aa | 31% |   | ADAM-TS Spacer 1 |
| Adaptin_N | PF01602 | 33 | 824 | 443 aa | 18% | 1gw5 | Adaptin N terminal region |
| Adap_comp_sub | PF00928 | 50 | 414 | 268 aa | 27% | 1bxx | Adaptor complexes medium subunit family |
| Ada_Zn_binding | PF02805 | 27 | 255 | 65 aa | 48% | 1adn | Metal binding domain of Ada |
| ADC | PF06314 | 8 | 79 | 235 aa | 40% |   | Acetoacetate decarboxylase (ADC) |
| ADC_lyase | PF02618 | 37 | 480 | 281 aa | 31% |   | Aminodeoxychorismate lyase |
| Adenine_glyco | PF03352 | 9 | 412 | 166 aa | 43% | 1nku | Methyladenine glycosylase |
| Adenosine_kin | PF04008 | 7 | 65 | 153 aa | 56% | 1rlh | Adenosine specific kinase |
| Adeno_100 | PF02438 | 12 | 59 | 590 aa | 59% |   | Late 100kD protein |
| Adeno_52K | PF03052 | 10 | 63 | 302 aa | 58% |   | Adenoviral protein 52K |
| Adeno_E1A | PF02703 | 7 | 115 | 197 aa | 47% |   | Early E1A protein |
| Adeno_E1B_19K | PF01691 | 9 | 56 | 155 aa | 43% |   | Adenovirus E1B 19K protein / small t-antigen |
| Adeno_E1B_55K | PF01696 | 10 | 62 | 330 aa | 53% |   | Adenovirus EB1 55K protein / large t-antigen |
| Adeno_E1B_55K_N | PF04623 | 5 | 57 | 67 aa | 44% |   | Adenovirus E1B protein N-terminus |
| Adeno_E3 | PF06040 | 5 | 29 | 136 aa | 66% |   | Adenovirus E3 protein |
| Adeno_E3A | PF05248 | 6 | 44 | 105 aa | 66% |   | Adenovirus E3A |
| Adeno_E3B | PF03376 | 6 | 43 | 89 aa | 62% |   | Adenovirus E3B protein |
| Adeno_E3_14_5 | PF04834 | 6 | 59 | 104 aa | 57% |   | Early E3 14.5 kDa protein |
| Adeno_E3_15_3 | PF03307 | 6 | 51 | 119 aa | 68% |   | Adenovirus 15.3kD protein in E3 region |
| Adeno_E3_CR1 | PF02440 | 6 | 89 | 76 aa | 41% |   | Adenovirus E3 region protein CR1 |
| Adeno_E3_CR2 | PF02439 | 5 | 65 | 45 aa | 50% |   | Adenovirus E3 region protein CR2 |
| Adeno_E4 | PF05385 | 5 | 33 | 102 aa | 58% |   | Mastadenovirus early E4 13 kDa protein |
| Adeno_E4_34 | PF04528 | 12 | 51 | 146 aa | 57% |   | Adenovirus early E4 34 kDa protein conserved region |
| Adeno_E4_ORF3 | PF06931 | 5 | 33 | 108 aa | 69% |   | Mastadenovirus E4 ORF3 protein |
| Adeno_GP19K | PF04881 | 3 | 42 | 139 aa | 55% |   | Adenovirus GP19K |
| Adeno_hexon | PF01065 | 13 | 973 | 221 aa | 42% | 1dhx | Hexon, adenovirus major coat protein, N-terminal domain |
| Adeno_hexon_C | PF03678 | 13 | 320 | 202 aa | 77% | 1dhx | Hexon, adenovirus major coat protein, C-terminal domain |
| Adeno_IVa2 | PF02456 | 8 | 59 | 350 aa | 63% |   | Adenovirus IVa2 protein |
| Adeno_knob | PF00541 | 9 | 190 | 179 aa | 40% | 1knb | Adenoviral fibre protein (knob domain) |
| Adeno_Penton_B | PF01686 | 9 | 80 | 481 aa | 68% |   | Adenovirus penton base protein |
| Adeno_PIX | PF03955 | 11 | 67 | 108 aa | 58% |   | Adenovirus hexon-associated protein (IX) |
| Adeno_PV | PF03910 | 8 | 42 | 343 aa | 59% |   | Adenovirus minor core protein PV |
| Adeno_PVIII | PF01310 | 7 | 86 | 200 aa | 55% |   | Adenovirus hexon associated protein, protein VIII |
| Adeno_PX | PF05829 | 15 | 64 | 43 aa | 69% |   | Adenovirus late L2 mu core protein (Protein X) |
| Adeno_shaft | PF00608 | 63 | 800 | 30 aa | 27% | 1qiu | Adenoviral fibre protein (repeat/shaft region) |
| Adeno_terminal | PF02459 | 8 | 61 | 554 aa | 63% |   | Adenoviral DNA terminal protein |
| Adeno_VII | PF03228 | 9 | 54 | 122 aa | 57% |   | Adenoviral core protein VII |
| Adenylate_cycl | PF01295 | 5 | 161 | 567 aa | 65% |   | Adenylate cyclase, class-I |
| Adenylsucc_synt | PF00709 | 114 | 705 | 405 aa | 46% | 1ade | Adenylosuccinate synthetase |
| Adenyl_transf | PF04439 | 6 | 72 | 254 aa | 40% |   | Streptomycin adenylyltransferase |
| Adhes-Ig_like | PF09085 | 5 | 13 | 107 aa | 70% | 1gsm | Adhesion molecule, immunoglobulin-like |
| Adhesin_Dr | PF04619 | 6 | 11 | 128 aa | 48% |   | Dr-family adhesin |
| Adhesin_P1 | PF03257 | 8 | 22 | 87 aa | 64% |   | Mycoplasma adhesin P1 |
| ADH_N | PF08240 | 93 | 7754 | 99 aa | 27% |   | Alcohol dehydrogenase GroES-like domain |
| adh_short | PF00106 | 230 | 18503 | 157 aa | 24% | 1hdc | short chain dehydrogenase |
| ADH_zinc_N | PF00107 | 108 | 8087 | 136 aa | 22% | 1hdx | Zinc-binding dehydrogenase |
| Adipokin_hormo | PF06377 | 2 | 14 | 62 aa | 44% |   | Adipokinetic hormone |
| ADK | PF00406 | 23 | 1288 | 162 aa | 38% | 1ake | Adenylate kinase |
| ADK_lid | PF05191 | 36 | 764 | 35 aa | 50% | 1ake | Adenylate kinase, active site lid |
| AdoHcyase | PF05221 | 9 | 539 | 404 aa | 49% | 1b3r | S-adenosyl-L-homocysteine hydrolase |
| AdoHcyase_NAD | PF00670 | 16 | 535 | 158 aa | 54% | 1b3r | S-adenosyl-L-homocysteine hydrolase, NAD binding domain |
| AdoMetDC_leader | PF08132 | 9 | 13 | 52 aa | 86% |   | S-adenosyl-l-methionine decarboxylase leader peptide |
| AdoMet_dc | PF02675 | 22 | 236 | 113 aa | 36% |   | S-adenosylmethionine decarboxylase |
| AdoMet_Synthase | PF01941 | 17 | 78 | 383 aa | 42% |   | S-adenosylmethionine synthetase (AdoMet synthetase) |
| ADP_PFK_GK | PF04587 | 9 | 47 | 386 aa | 28% | 1l2l | ADP-specific Phosphofructokinase/Glucokinase conserved region |
| ADP_ribosyl_GH | PF03747 | 20 | 333 | 281 aa | 21% | 1t5j | ADP-ribosylglycohydrolase |
| Adrenomedullin | PF02039 | 2 | 15 | 130 aa | 53% |   | Adrenomedullin |
| Ad_cyc_g-alpha | PF08509 | 13 | 30 | 53 aa | 29% |   | Adenylate cyclase G-alpha binding domain |
| Aegerolysin | PF06355 | 12 | 35 | 114 aa | 33% |   | Aegerolysin |
| Aerolysin | PF01117 | 6 | 133 | 191 aa | 62% | 1pre | Aerolysin toxin |
| AF-4 | PF05110 | 8 | 62 | 567 aa | 34% |   | AF-4 proto-oncoprotein |
| AfaD | PF05775 | 8 | 25 | 137 aa | 49% |   | Enterobacteria AfaD invasin protein |
| AFG1_ATPase | PF03969 | 8 | 397 | 354 aa | 35% |   | AFG1-like ATPase |
| AflR | PF08493 | 4 | 62 | 249 aa | 64% |   | Aflatoxin regulatory protein |
| AFOR_C | PF01314 | 9 | 194 | 360 aa | 27% | 1aor | Aldehyde ferredoxin oxidoreductase, domains 2 & 3 |
| AFOR_N | PF02730 | 12 | 210 | 196 aa | 36% | 1aor | Aldehyde ferredoxin oxidoreductase, N-terminal domain |
| AFP | PF02420 | 9 | 542 | 11 aa | 44% | 1ezg | Insect antifreeze protein repeat |
| AfsA | PF03756 | 9 | 31 | 77 aa | 29% |   | A-factor biosynthesis repeat |
| AFT | PF08731 | 8 | 11 | 109 aa | 42% |   | Transcription factor AFT |
| Ag332 | PF04671 | 43 | 326 | 21 aa | 45% |   | Erythrocyte membrane-associated giant protein antigen 332 |
| Agenet | PF05641 | 34 | 146 | 67 aa | 28% |   | Agenet domain |
| Agglutinin | PF07468 | 2 | 9 | 145 aa | 52% | 1jlx | Agglutinin |
| Agouti | PF05039 | 5 | 86 | 105 aa | 51% | 1hyk | Agouti protein |
| AgrB | PF04647 | 11 | 116 | 168 aa | 34% |   | Accessory gene regulator B |
| AgrD | PF05931 | 19 | 48 | 45 aa | 43% |   | Staphylococcal AgrD protein |
| Agro_virD5 | PF04730 | 4 | 8 | 726 aa | 67% |   | Agrobacterium VirD5 protein |
| AGTRAP | PF06396 | 2 | 9 | 156 aa | 67% |   | Angiotensin II, type I receptor-associated protein (AGTRAP) |
| Aha1_N | PF09229 | 41 | 95 | 128 aa | 27% | 1usu | Activator of Hsp90 ATPase, N-terminal |
| AhpC-TSA | PF00578 | 129 | 2968 | 121 aa | 24% | 1prx | AhpC/TSA family |
| AHS1 | PF02682 | 4 | 369 | 207 aa | 30% |   | Allophanate hydrolase subunit 1 |
| AHS2 | PF02626 | 5 | 386 | 281 aa | 33% |   | Allophanate hydrolase subunit 2 |
| AHSA1 | PF08327 | 118 | 617 | 67 aa | 21% |   | Activator of Hsp90 ATPase homolog 1-like protein |
| AHSP | PF09236 | 2 | 5 | 88 aa | 74% | 1w09 | Alpha-haemoglobin stabilising protein |
| AICARFT_IMPCHas | PF01808 | 9 | 666 | 293 aa | 42% | 1m9n | AICARFT/IMPCHase bienzyme |
| AIG1 | PF04548 | 32 | 209 | 190 aa | 28% |   | AIG1 family |
| AIG2 | PF06094 | 99 | 392 | 102 aa | 21% |   | AIG2-like family |
| Ail_Lom | PF06316 | 2 | 118 | 182 aa | 40% | 1qj9 | Enterobacterial Ail/Lom protein |
| AIP3 | PF03915 | 3 | 26 | 407 aa | 39% |   | Actin interacting protein 3 |
| AIRC | PF00731 | 13 | 636 | 154 aa | 50% | 1d7a | AIR carboxylase |
| AIRS | PF00586 | 54 | 2274 | 149 aa | 22% | 1cli | AIR synthase related protein, N-terminal domain |
| AIRS_C | PF02769 | 172 | 2830 | 154 aa | 18% | 1cli | AIR synthase related protein, C-terminal domain |
| AKAP95 | PF04988 | 3 | 34 | 359 aa | 37% |   | A-kinase anchoring protein 95 (AKAP95) |
| AKAP_110 | PF05716 | 4 | 31 | 459 aa | 50% |   | A-kinase anchor protein 110 kDa (AKAP 110) |
| ALAD | PF00490 | 10 | 644 | 307 aa | 49% | 1aw5 | Delta-aminolevulinic acid dehydratase |
| AlaDh_PNT_C | PF01262 | 100 | 793 | 160 aa | 36% | 1say | Alanine dehydrogenase/PNT, C-terminal domain |
| AlaDh_PNT_N | PF05222 | 42 | 781 | 131 aa | 36% | 1say | Alanine dehydrogenase/PNT, N-terminal domain |
| Ala_racemase_C | PF00842 | 45 | 658 | 125 aa | 36% | 1sft | Alanine racemase, C-terminal domain |
| Ala_racemase_N | PF01168 | 60 | 1384 | 217 aa | 22% | 1sft | Alanine racemase, N-terminal domain |
| Alb1 | PF09135 | 5 | 6 | 162 aa | 45% |   | Alb1 |
| Alba | PF01918 | 29 | 143 | 71 aa | 27% | 1h0y | Alba |
| Albicidin_res | PF05583 | 4 | 34 | 75 aa | 39% |   | Albicidin resistance domain |
| Albumin_I | PF08027 | 4 | 35 | 93 aa | 60% |   | Albumin I |
| Aldedh | PF00171 | 121 | 6798 | 398 aa | 28% | 1ag8 | Aldehyde dehydrogenase family |
| Aldolase | PF01081 | 5 | 467 | 194 aa | 33% | 1fwr | KDPG and KHG aldolase |
| Aldolase_II | PF00596 | 51 | 1115 | 198 aa | 21% | 1fua | Class II Aldolase and Adducin N-terminal domain |
| Aldose_epim | PF01263 | 67 | 907 | 266 aa | 20% | 1jov | Aldose 1-epimerase |
| Aldo_ket_red | PF00248 | 67 | 4059 | 279 aa | 24% | 1ads | Aldo/keto reductase family |
| Ald_Xan_dh_C | PF01315 | 30 | 1067 | 106 aa | 33% | 1alo | Aldehyde oxidase and xanthine dehydrogenase, a/b hammerhead domain |
| Ald_Xan_dh_C2 | PF02738 | 30 | 2131 | 268 aa | 18% | 1alo | Aldehyde oxidase and xanthine dehydrogenase, molybdopterin binding domain |
| ALF | PF03752 | 24 | 48 | 46 aa | 29% |   | Short repeats of unknown function |
| Alg14 | PF08660 | 39 | 131 | 152 aa | 31% |   | Oligosaccharide biosynthesis protein Alg14 like |
| ALG3 | PF05208 | 8 | 54 | 345 aa | 41% |   | ALG3 protein |
| Alg6_Alg8 | PF03155 | 9 | 108 | 419 aa | 34% |   | ALG6, ALG8 glycosyltransferase family |
| Alginate_lyase | PF05426 | 4 | 30 | 340 aa | 49% | 1qaz | Alginate lyase |
| Alginate_lyase2 | PF08787 | 30 | 70 | 227 aa | 24% | 1uai | Alginate lyase |
| AlkA_N | PF06029 | 11 | 135 | 119 aa | 34% | 1diz | AlkA N-terminal domain |
| Alk_phosphatase | PF00245 | 10 | 544 | 354 aa | 31% | 1alk | Alkaline phosphatase |
| Allantoicase | PF03561 | 13 | 232 | 142 aa | 40% | 1sg3 | Allantoicase repeat |
| Allatostatin | PF05953 | 21 | 249 | 11 aa | 59% |   | Allatostatin |
| Allene_ox_cyc | PF06351 | 7 | 26 | 170 aa | 67% |   | Allene oxide cyclase |
| Allexi_40kDa | PF05549 | 7 | 11 | 330 aa | 41% |   | Allexivirus 40kDa protein |
| Alliinase_C | PF04864 | 10 | 44 | 313 aa | 55% | 1lk9 | Allinase |
| ALO | PF04030 | 36 | 182 | 237 aa | 24% |   | D-arabinono-1,4-lactone oxidase |
| Alpha-2-MRAP_C | PF06401 | 5 | 30 | 206 aa | 57% |   | Alpha-2-macroglobulin RAP, C-terminal domain |
| Alpha-2-MRAP_N | PF06400 | 4 | 28 | 114 aa | 61% | 1lre | Alpha-2-macroglobulin RAP, N-terminal domain |
| Alpha-amylase | PF00128 | 54 | 4103 | 289 aa | 21% | 1ppi | Alpha amylase, catalytic domain |
| Alpha-amylase_C | PF02806 | 260 | 947 | 88 aa | 26% | 1ppi | Alpha amylase, C-terminal all-beta domain |
| Alpha-amylase_N | PF02903 | 11 | 100 | 113 aa | 31% | 1sma | Alpha amylase, N-terminal ig-like domain |
| Alpha-amyl_C | PF09071 | 5 | 6 | 66 aa | 40% | 1eh9 | Alpha-amylase, C terminal |
| Alpha-amyl_C2 | PF07821 | 17 | 75 | 60 aa | 48% |   | Alpha-amylase C-terminal beta-sheet domain |
| Alpha-L-AF_C | PF06964 | 25 | 164 | 195 aa | 25% | 1pz2 | Alpha-L-arabinofuranosidase C-terminus |
| Alpha-mann_mid | PF09261 | 87 | 262 | 78 aa | 30% | 1o7d | Alpha mannosidase, middle domain |
| AlphaC_N | PF08829 | 5 | 30 | 184 aa | 71% |   | Alpha C protein N terminal |
| Alpha_adaptinC2 | PF02883 | 24 | 250 | 113 aa | 20% | 1qtp | Adaptin C-terminal domain |
| Alpha_adaptin_C | PF02296 | 4 | 45 | 113 aa | 50% | 1qtp | Alpha adaptin AP2, C-terminal domain |
| Alpha_E1_glycop | PF01589 | 8 | 451 | 272 aa | 41% | 1rer | Alphavirus E1 glycoprotein |
| Alpha_E2_glycop | PF00943 | 11 | 585 | 248 aa | 39% |   | Alphavirus E2 glycoprotein |
| Alpha_E3_glycop | PF01563 | 10 | 307 | 56 aa | 60% |   | Alphavirus E3 glycoprotein |
| Alpha_GJ | PF03229 | 5 | 43 | 76 aa | 65% |   | Alphavirus glycoprotein J |
| Alpha_kinase | PF02816 | 8 | 100 | 205 aa | 27% | 1ia9 | Alpha-kinase family |
| Alpha_L_fucos | PF01120 | 3 | 151 | 314 aa | 37% | 1hl9 | Alpha-L-fucosidase |
| Alpha_TIF | PF02232 | 8 | 42 | 341 aa | 45% | 16vp | Alpha trans-inducing protein (Alpha-TIF) |
| Alph_Pro_TM | PF09608 | 35 | 51 | 221 aa | 34% |   | Putative transmembrane protein (Alph_Pro_TM) |
| Alum_res | PF06838 | 14 | 112 | 384 aa | 52% |   | Aluminium resistance protein |
| AMA-1 | PF02430 | 4 | 373 | 306 aa | 69% | 1hn6 | Apical membrane antigen 1 |
| Amastin | PF07344 | 3 | 58 | 155 aa | 37% |   | Amastin surface glycoprotein |
| Amb_V_allergen | PF03913 | 2 | 4 | 43 aa | 60% | 1bbg | Amb V Allergen |
| Amelin | PF05111 | 4 | 18 | 370 aa | 59% |   | Ameloblastin precursor (Amelin) |
| Amelogenin | PF02948 | 6 | 112 | 114 aa | 66% |   | Amelogenin |
| AMH_N | PF04709 | 5 | 24 | 352 aa | 37% |   | Anti-Mullerian hormone, N terminal region |
| Amidase | PF01425 | 44 | 2090 | 420 aa | 26% | 1ocm | Amidase |
| Amidase_2 | PF01510 | 57 | 1001 | 151 aa | 21% | 1lba | N-acetylmuramoyl-L-alanine amidase |
| Amidase_3 | PF01520 | 31 | 893 | 191 aa | 29% | 1jwq | N-acetylmuramoyl-L-alanine amidase |
| Amidase_5 | PF05382 | 8 | 38 | 139 aa | 43% |   | Bacteriophage peptidoglycan hydrolase |
| Amidinotransf | PF02274 | 27 | 431 | 332 aa | 25% | 1jdw | Amidinotransferase |
| Amidohydro_1 | PF01979 | 58 | 4432 | 219 aa | 17% | 1j79 | Amidohydrolase family |
| Amidohydro_2 | PF04909 | 137 | 1181 | 286 aa | 14% |   | Amidohydrolase |
| Amidohydro_3 | PF07969 | 43 | 1073 | 344 aa | 19% |   | Amidohydrolase family |
| Amido_AtzD_TrzD | PF09663 | 9 | 15 | 350 aa | 54% |   | Amidohydrolase ring-opening protein (Amido_AtzD_TrzD) |
| Aminotran_1_2 | PF00155 | 48 | 7734 | 314 aa | 18% | 1art | Aminotransferase class I and II |
| Aminotran_3 | PF00202 | 18 | 3499 | 317 aa | 29% | 1dgd | Aminotransferase class-III |
| Aminotran_4 | PF01063 | 25 | 1313 | 264 aa | 26% | 1daa | Aminotransferase class IV |
| Aminotran_5 | PF00266 | 45 | 3509 | 309 aa | 21% | 1bjo | Aminotransferase class-V |
| Amino_oxidase | PF01593 | 86 | 2116 | 309 aa | 18% | 1b37 | Flavin containing amine oxidoreductase |
| AmiS_UreI | PF02293 | 5 | 202 | 186 aa | 77% |   | AmiS/UreI family transporter |
| AMMECR1 | PF01871 | 6 | 186 | 176 aa | 29% |   | AMMECR1 |
| Ammonium_transp | PF00909 | 25 | 1230 | 371 aa | 27% |   | Ammonium Transporter Family |
| AMO | PF02461 | 5 | 3178 | 149 aa | 60% |   | Ammonia monooxygenase |
| AmoA | PF05145 | 8 | 155 | 292 aa | 25% |   | Putative ammonia monooxygenase |
| AmoC | PF04896 | 4 | 28 | 250 aa | 57% |   | Ammonia monooxygenase/methane monooxygenase, subunit C |
| AMOP | PF03782 | 6 | 40 | 151 aa | 31% |   | AMOP domain |
| AMP-binding | PF00501 | 401 | 13267 | 335 aa | 21% | 1lci | AMP-binding enzyme |
| AMPKBI | PF04739 | 13 | 98 | 93 aa | 42% |   | 5'-AMP-activated protein kinase, beta subunit, complex-interacting region |
| AMP_N | PF05195 | 16 | 348 | 126 aa | 29% | 1az9 | Aminopeptidase P, N-terminal domain |
| ANATO | PF01821 | 18 | 141 | 35 aa | 40% | 1c5a | Anaphylotoxin-like domain |
| Androgen_recep | PF02166 | 3 | 125 | 273 aa | 68% |   | Androgen receptor |
| Anemone_cytotox | PF06369 | 3 | 27 | 111 aa | 51% | 1kd6 | Sea anemone cytotoxic protein |
| AnfG_VnfG | PF03139 | 11 | 39 | 111 aa | 45% |   | Vanadium/alternative nitrogenase delta subunit |
| AnfO_nitrog | PF09582 | 11 | 16 | 195 aa | 30% |   | Iron only nitrogenase protein AnfO (AnfO_nitrog) |
| ANF_receptor | PF01094 | 120 | 2261 | 293 aa | 15% | 2liv | Receptor family ligand binding region |
| Ank | PF00023 | 1163 | 56928 | 30 aa | 28% | 1awc | Ankyrin repeat |
| ANKH | PF07260 | 2 | 13 | 443 aa | 89% |   | Progressive ankylosis protein (ANKH) |
| Annexin | PF00191 | 180 | 1831 | 63 aa | 30% | 2ran | Annexin |
| ANP | PF00212 | 14 | 171 | 77 aa | 42% | 1anp | Atrial natriuretic peptide |
| Anp1 | PF03452 | 7 | 64 | 342 aa | 44% |   | Anp1 |
| ANT | PF03374 | 4 | 101 | 128 aa | 48% |   | Phage antirepressor protein |
| AntA | PF08346 | 28 | 105 | 67 aa | 41% |   | AntA/AntB antirepressor |
| ANTAR | PF03861 | 18 | 406 | 56 aa | 30% | 1qo0 | ANTAR domain |
| ANTH | PF07651 | 29 | 192 | 243 aa | 24% |   | ANTH domain |
| Anthrax-tox_M | PF09156 | 2 | 2 | 287 aa | 100% | 1j7n | Anthrax toxin lethal factor, middle domain |
| Anthrax_toxA | PF03497 | 7 | 17 | 150 aa | 43% | 1jky | Anthrax toxin LF subunit |
| Anth_Ig | PF05587 | 3 | 30 | 98 aa | 56% |   | Anthrax receptor extracellular domain |
| Anth_synt_I_N | PF04715 | 67 | 944 | 134 aa | 24% | 1i1q | Anthranilate synthase component I, N terminal region |
| Anti-silence | PF04729 | 6 | 93 | 147 aa | 49% | 1roc | Anti-silencing protein, ASF1-like |
| Antibiotic_NAT | PF02522 | 11 | 96 | 202 aa | 36% |   | Aminoglycoside 3-N-acetyltransferase |
| Anticodon_1 | PF08264 | 179 | 2178 | 135 aa | 22% | 1ivs | Anticodon-binding domain |
| Antig_Caf1 | PF09255 | 2 | 8 | 132 aa | 100% | 1p5v | Caf1 Capsule antigen |
| Antimicrobial10 | PF08105 | 2 | 2 | 52 aa | 100% |   | Metchnikowin family |
| Antimicrobial11 | PF08106 | 2 | 2 | 16 aa | 88% |   | Formaecin family |
| Antimicrobial12 | PF08107 | 4 | 29 | 38 aa | 50% |   | Pleurocidin family |
| Antimicrobial13 | PF08108 | 2 | 2 | 15 aa | 100% |   | Halocidin family |
| Antimicrobial14 | PF08109 | 2 | 2 | 31 aa | 100% |   | Lactocin 705 family |
| Antimicrobial15 | PF08110 | 2 | 3 | 19 aa | 60% |   | Ocellatin family |
| Antimicrobial16 | PF08128 | 3 | 6 | 42 aa | 78% |   | Double glycine cleavage site bacteriolysin |
| Antimicrobial17 | PF08129 | 2 | 6 | 41 aa | 59% |   | Alpha/beta enterocin family |
| Antimicrobial18 | PF08130 | 2 | 3 | 43 aa | 62% |   | Type A lantibiotic family |
| Antimicrobial19 | PF08225 | 4 | 4 | 23 aa | 77% |   | Pseudin antimicrobial peptide |
| Antimicrobial20 | PF08256 | 14 | 38 | 13 aa | 58% |   | Aurein-like antibiotic peptide |
| Antimicrobial_1 | PF08018 | 15 | 46 | 23 aa | 58% |   | Frog antimicrobial peptide |
| Antimicrobial_2 | PF08023 | 18 | 82 | 31 aa | 36% |   | Frog antimicrobial peptide |
| Antimicrobial_3 | PF08025 | 2 | 4 | 37 aa | 84% |   | Spider antimicrobial peptide |
| Antimicrobial_4 | PF08024 | 5 | 6 | 23 aa | 53% |   | Ant antimicrobial peptide |
| Antimicrobial_5 | PF08026 | 2 | 4 | 35 aa | 78% |   | Bee antimicrobial peptide |
| Antimicrobial_6 | PF08036 | 3 | 3 | 38 aa | 65% |   | Diapausin family of antimicrobial peptide |
| Antimicrobial_7 | PF08102 | 3 | 7 | 42 aa | 76% |   | Scorpion antimicrobial peptide |
| Antimicrobial_8 | PF08103 | 4 | 7 | 17 aa | 59% |   | Uperin family |
| Antimicrobial_9 | PF08104 | 2 | 2 | 24 aa | 96% |   | Ponericin L family |
| Antirestrict | PF03230 | 6 | 95 | 97 aa | 46% |   | Antirestriction protein |
| Antistasin | PF02822 | 11 | 113 | 26 aa | 40% | 1hia | Antistasin family |
| Antiterm | PF03589 | 4 | 61 | 92 aa | 30% |   | Antitermination protein |
| Ant_C | PF05586 | 2 | 19 | 91 aa | 69% |   | Anthrax receptor C-terminus region |
| An_peroxidase | PF03098 | 17 | 503 | 311 aa | 25% | 1mhl | Animal haem peroxidase |
| AOX | PF01786 | 10 | 181 | 241 aa | 46% |   | Alternative oxidase |
| AP2 | PF00847 | 235 | 1562 | 52 aa | 38% | 3gcc | AP2 domain |
| ApbA | PF02558 | 100 | 671 | 151 aa | 23% | 1ks9 | Ketopantoate reductase PanE/ApbA |
| ApbA_C | PF08546 | 101 | 650 | 125 aa | 25% | 1ks9 | Ketopantoate reductase PanE/ApbA C terminal |
| ApbE | PF02424 | 12 | 468 | 296 aa | 26% |   | ApbE family |
| APC10 | PF03256 | 7 | 80 | 179 aa | 31% | 1gqp | Anaphase-promoting complex, subunit 10 (APC10) |
| Apc13p | PF05839 | 3 | 13 | 87 aa | 50% |   | Apc13p protein |
| Apc15p | PF05841 | 2 | 2 | 156 aa | 32% |   | Apc15p protein |
| APC2 | PF08672 | 14 | 41 | 59 aa | 44% | 1ldd | Anaphase promoting complex (APC) subunit 2 |
| APC8 | PF04049 | 4 | 54 | 144 aa | 33% |   | Anaphase promoting complex subunit 8 / Cdc23 |
| APC_15aa | PF05972 | 9 | 33 | 16 aa | 49% | 1jpp | APC 15 residue motif |
| APC_basic | PF05956 | 3 | 11 | 306 aa | 55% |   | APC basic domain |
| APC_crr | PF05923 | 27 | 109 | 26 aa | 40% |   | APC cysteine-rich region |
| APG12 | PF04110 | 6 | 44 | 93 aa | 35% |   | Ubiquitin-like autophagy protein Apg12 |
| APG17 | PF04108 | 2 | 17 | 175 aa | 41% |   | Autophagy protein Apg17 |
| APG5 | PF04106 | 4 | 73 | 197 aa | 35% |   | Autophagy protein Apg5 |
| APG6 | PF04111 | 5 | 96 | 317 aa | 36% |   | Autophagy protein Apg6 |
| APG9 | PF04109 | 4 | 82 | 359 aa | 36% |   | Autophagy protein Apg9 |
| APH | PF01636 | 272 | 1904 | 236 aa | 15% | 1j7l | Phosphotransferase enzyme family |
| Aph-1 | PF06105 | 6 | 36 | 231 aa | 52% |   | Aph-1 protein |
| aPHC | PF05875 | 9 | 70 | 247 aa | 27% |   | Alkaline phytoceramidase (aPHC) |
| APH_6_hur | PF04655 | 9 | 101 | 215 aa | 39% |   | Aminoglycoside/hydroxyurea antibiotic resistance kinase |
| API5 | PF05918 | 3 | 36 | 407 aa | 35% |   | Apoptosis inhibitory protein 5 (API5) |
| Apidaecin | PF00807 | 2 | 26 | 27 aa | 94% |   | Apidaecin |
| Apo-CII | PF05355 | 6 | 9 | 74 aa | 64% | 1by6 | Apolipoprotein C-II |
| Apo-CIII | PF05778 | 5 | 10 | 84 aa | 62% |   | Apolipoprotein CIII (Apo-CIII) |
| Apo-VLDL-II | PF05418 | 3 | 7 | 82 aa | 78% |   | Apovitellenin I (Apo-VLDL-II) |
| ApoA-II | PF04711 | 4 | 10 | 76 aa | 67% | 1l6k | Apolipoprotein A-II (ApoA-II) |
| APOBEC_C | PF05240 | 16 | 229 | 62 aa | 44% |   | APOBEC-like C-terminal domain |
| APOBEC_N | PF08210 | 22 | 239 | 110 aa | 44% |   | APOBEC-like N-terminal domain |
| ApoC-I | PF04691 | 4 | 10 | 53 aa | 66% | 1ale | Apolipoprotein C-I (ApoC-1) |
| Apocytochr_F_C | PF01333 | 11 | 174 | 107 aa | 68% | 1ctm | Apocytochrome F, C-terminal |
| ApoL | PF05461 | 7 | 41 | 265 aa | 37% |   | Apolipoprotein L |
| Apolipoprotein | PF01442 | 21 | 152 | 189 aa | 24% | 1oef | Apolipoprotein A1/A4/E domain |
| ApoLp-III | PF07464 | 5 | 12 | 160 aa | 70% | 1eq1 | Apolipophorin-III precursor (apoLp-III) |
| APSES | PF02292 | 8 | 100 | 82 aa | 42% | 1bm8 | APSES domain |
| APS_kinase | PF01583 | 20 | 527 | 155 aa | 49% | 1d6j | Adenylylsulphate kinase |
| APT | PF03440 | 5 | 36 | 91 aa | 53% | 1pre | Aerolysin/Pertussis toxin (APT) domain |
| Apyrase | PF06079 | 7 | 45 | 305 aa | 44% | 1s1d | Apyrase |
| AP_endonuc_2 | PF01261 | 314 | 2096 | 202 aa | 15% | 1qtw | Xylose isomerase-like TIM barrel |
| AP_endonuc_2_N | PF07582 | 9 | 108 | 51 aa | 37% |   | AP endonuclease family 2 C terminus |
| ArabFuran-catal | PF09206 | 4 | 23 | 308 aa | 76% | 1wd3 | Alpha-L-arabinofuranosidase B, catalytic |
| Arabinose_Isome | PF02610 | 2 | 83 | 477 aa | 55% |   | L-arabinose isomerase |
| Arabinose_trans | PF04602 | 7 | 88 | 718 aa | 55% |   | Mycobacterial cell wall arabinan synthesis protein |
| AraC_binding | PF02311 | 59 | 747 | 126 aa | 16% | 2aac | AraC-like ligand binding domain |
| AraC_E_bind | PF06445 | 100 | 597 | 150 aa | 16% | 1d5y | Bacterial transcription activator, effector binding domain |
| AraC_N | PF06719 | 23 | 238 | 153 aa | 32% |   | AraC-type transcriptional regulator N-terminus |
| Arb1 | PF09692 | 9 | 12 | 359 aa | 37% |   | Argonaute siRNA chaperone (ARC) complex subunit Arb1 |
| Arc | PF03869 | 3 | 61 | 46 aa | 39% | 1myk | Arc-like DNA binding domain |
| ARC105 | PF09606 | 5 | 17 | 63 aa | 60% |   | ARC105 domain |
| Arch_ATPase | PF01637 | 32 | 218 | 186 aa | 23% |   | Archaeal ATPase |
| Arch_flagellin | PF01917 | 19 | 83 | 211 aa | 32% |   | Archaebacterial flagellin |
| Arch_fla_DE | PF04659 | 12 | 25 | 108 aa | 37% |   | Archaeal flagella protein |
| Arc_PepC | PF06819 | 6 | 9 | 110 aa | 33% |   | Archaeal Peptidase A24 C-terminal Domain |
| Arc_PepC_II | PF06847 | 10 | 22 | 84 aa | 27% |   | Archaeal Peptidase A24 C-terminus Type II |
| Arc_trans_TRASH | PF08394 | 8 | 15 | 33 aa | 45% |   | Archaeal TRASH domain |
| ARD | PF03079 | 11 | 160 | 147 aa | 32% | 1m4o | ARD/ARD' family |
| ArdA | PF07275 | 11 | 60 | 163 aa | 30% |   | Antirestriction protein (ArdA) |
| AreA_N | PF07573 | 4 | 14 | 84 aa | 60% |   | Nitrogen regulatory protein AreA N terminus |
| Arena_glycoprot | PF00798 | 7 | 214 | 300 aa | 44% | 1s7q | Arenavirus glycoprotein |
| Arena_nucleocap | PF00843 | 8 | 321 | 266 aa | 57% |   | Arenavirus nucleocapsid protein |
| Arena_RNA_pol | PF06317 | 4 | 75 | 1039 aa | 49% |   | Arenavirus RNA polymerase |
| Arf | PF00025 | 20 | 1049 | 167 aa | 39% | 1hur | ADP-ribosylation factor family |
| Arfaptin | PF06456 | 11 | 83 | 217 aa | 32% | 1i4l | Arfaptin-like domain |
| ArfGap | PF01412 | 23 | 624 | 119 aa | 32% | 1dcq | Putative GTPase activating protein for Arf |
| Arginase | PF00491 | 11 | 878 | 276 aa | 27% | 1rla | Arginase family |
| Arginosuc_synth | PF00764 | 12 | 594 | 377 aa | 41% | 1kp2 | Arginosuccinate synthase |
| ArgJ | PF01960 | 15 | 403 | 387 aa | 41% |   | ArgJ family |
| ArgK | PF03308 | 9 | 268 | 245 aa | 41% |   | ArgK protein |
| Arg_repressor | PF01316 | 10 | 363 | 69 aa | 34% | 1aoy | Arginine repressor, DNA binding domain |
| Arg_repressor_C | PF02863 | 49 | 379 | 68 aa | 32% | 1aoy | Arginine repressor, C-terminal domain |
| Arg_tRNA_synt_N | PF03485 | 55 | 680 | 86 aa | 28% | 1f7u | Arginyl tRNA synthetase N terminal domain |
| ARID | PF01388 | 12 | 301 | 98 aa | 29% | 1bmy | ARID/BRIGHT DNA binding domain |
| Arif-1 | PF06770 | 8 | 26 | 197 aa | 29% |   | Actin-rearrangement-inducing factor (Arif-1) |
| Arm | PF00514 | 244 | 3701 | 41 aa | 22% | 3bct | Armadillo/beta-catenin-like repeat |
| ARM_1 | PF04683 | 6 | 62 | 249 aa | 41% |   | Adhesion regulating molecule conserved region |
| AroM | PF07302 | 4 | 23 | 221 aa | 57% |   | AroM protein |
| ARPC4 | PF05856 | 6 | 74 | 163 aa | 61% |   | ARP2/3 complex 20 kDa subunit (ARPC4) |
| Arrestin_C | PF02752 | 61 | 352 | 141 aa | 20% | 1cf1 | Arrestin (or S-antigen), C-terminal domain |
| Arrestin_N | PF00339 | 43 | 408 | 137 aa | 22% | 1cf1 | Arrestin (or S-antigen), N-terminal domain |
| ARS2 | PF04959 | 3 | 28 | 203 aa | 62% |   | Arsenite-resistance protein 2 |
| ArsA_ATPase | PF02374 | 11 | 478 | 288 aa | 26% | 1f48 | Anion-transporting ATPase |
| ArsB | PF02040 | 4 | 212 | 389 aa | 45% |   | Arsenical pump membrane protein |
| ArsC | PF03960 | 36 | 875 | 110 aa | 27% | 1i9d | ArsC family |
| ArsD | PF06953 | 3 | 65 | 118 aa | 41% |   | Arsenical resistance operon trans-acting repressor ArsD |
| ART | PF01129 | 9 | 91 | 189 aa | 37% | 1gy0 | NAD:arginine ADP-ribosyltransferase |
| Arteri_env | PF01606 | 3 | 134 | 210 aa | 74% |   | Arterivirus envelope protein |
| Arteri_Gl | PF00951 | 8 | 4353 | 171 aa | 73% |   | Arterivirus GL envelope glycoprotein |
| Arteri_GP4 | PF02497 | 3 | 81 | 170 aa | 78% |   | Arterivirus glycoprotein |
| Arteri_nucleo | PF01481 | 4 | 253 | 107 aa | 66% | 1p65 | Arterivirus nucleocapsid protein |
| Arv1 | PF04161 | 7 | 56 | 148 aa | 33% |   | Arv1-like family |
| Arylesterase | PF01731 | 6 | 58 | 77 aa | 41% |   | Arylesterase |
| Arylsulfotrans | PF05935 | 8 | 65 | 389 aa | 37% |   | Arylsulfotransferase (ASST) |
| ASC | PF00858 | 28 | 332 | 345 aa | 21% |   | Amiloride-sensitive sodium channel |
| ASCH | PF04266 | 89 | 281 | 102 aa | 19% |   | ASCH domain |
| ASD1 | PF08688 | 7 | 30 | 142 aa | 44% |   | Apx/Shroom domain ASD1 |
| ASD2 | PF08687 | 9 | 48 | 252 aa | 45% |   | Apx/Shroom domain ASD2 |
| ASFV_360 | PF01671 | 14 | 22 | 204 aa | 42% |   | African swine fever virus multigene family 360 protein |
| ASFV_J13L | PF05568 | 2 | 9 | 184 aa | 86% |   | African swine fever virus J13L protein |
| ASFV_L11L | PF05293 | 2 | 8 | 77 aa | 90% |   | African swine fever virus (ASFV) L11L protein |
| ASFV_p27 | PF06556 | 2 | 11 | 131 aa | 97% |   | IAP-like protein p27 C-terminus |
| AsiA | PF09010 | 5 | 8 | 91 aa | 45% |   | Anti-Sigma Factor A |
| ASL_C | PF08328 | 37 | 251 | 114 aa | 58% |   | Adenylosuccinate lyase C-terminal |
| AsmA | PF05170 | 12 | 419 | 366 aa | 17% |   | AsmA family |
| AsnA | PF03590 | 6 | 117 | 233 aa | 53% | 12as | Aspartate-ammonia ligase |
| AsnC_trans_reg | PF01037 | 264 | 2185 | 75 aa | 23% | 1i1g | AsnC family |
| Asn_synthase | PF00733 | 105 | 907 | 266 aa | 26% | 1ct9 | Asparagine synthase |
| Asp | PF00026 | 23 | 1337 | 304 aa | 27% | 1mpp | Eukaryotic aspartyl protease |
| Asp-Al_Ex | PF06826 | 34 | 324 | 168 aa | 27% |   | Predicted Permease Membrane Region |
| Asp-B-Hydro_N | PF05279 | 2 | 51 | 196 aa | 64% |   | Aspartyl beta-hydroxylase N-terminal region |
| Asparaginase | PF00710 | 110 | 572 | 303 aa | 29% | 3pga | Asparaginase |
| Asparaginase_2 | PF01112 | 7 | 375 | 246 aa | 36% | 1ayl | Asparaginase |
| Asparaginase_II | PF06089 | 11 | 100 | 321 aa | 36% |   | L-asparaginase II |
| Asp_Arg_Hydrox | PF05118 | 12 | 185 | 159 aa | 31% | 1e5r | Aspartyl/Asparaginyl beta-hydroxylase |
| Asp_decarbox | PF02261 | 8 | 297 | 114 aa | 50% | 1aw8 | Aspartate decarboxylase |
| Asp_Glu_race | PF01177 | 66 | 1193 | 209 aa | 22% | 1b74 | Asp/Glu/Hydantoin racemase |
| Asp_protease | PF09668 | 12 | 77 | 120 aa | 53% |   | Aspartyl protease |
| Asr | PF06392 | 8 | 82 | 20 aa | 60% |   | Acid shock protein repeat |
| AstA | PF04958 | 6 | 158 | 337 aa | 42% |   | Arginine N-succinyltransferase beta subunit |
| Astacin | PF01400 | 26 | 402 | 180 aa | 35% | 1ast | Astacin (Peptidase family M12A) |
| AstB | PF04996 | 4 | 100 | 432 aa | 58% |   | Succinylarginine dihydrolase |
| AstE_AspA | PF04952 | 33 | 458 | 278 aa | 19% |   | Succinylglutamate desuccinylase / Aspartoacylase family |
| Astro_capsid | PF03115 | 7 | 494 | 190 aa | 60% |   | Astrovirus capsid protein precursor |
| ATE_C | PF04377 | 13 | 251 | 139 aa | 35% |   | Arginine-tRNA-protein transferase, C terminus |
| ATE_N | PF04376 | 11 | 241 | 88 aa | 34% |   | Arginine-tRNA-protein transferase, N terminus |
| ATG16 | PF08614 | 17 | 57 | 161 aa | 25% |   | Autophagy protein 16 (ATG16) |
| ATG27 | PF09451 | 15 | 38 | 257 aa | 19% |   | Autophagy-related protein 27 |
| ATG_C | PF09333 | 22 | 67 | 96 aa | 35% |   | ATG C terminal domain |
| ATHILA | PF03078 | 13 | 44 | 259 aa | 32% |   | ATHILA ORF-1 family |
| ATLF | PF07737 | 3 | 8 | 222 aa | 40% | 1pwq | Anthrax toxin lethal factor, N- and C-terminal domain |
| ATP-cone | PF03477 | 73 | 1114 | 91 aa | 24% | 7r1r | ATP cone domain |
| ATP-grasp | PF02222 | 23 | 920 | 157 aa | 30% | 1scu | ATP-grasp domain |
| ATP-grasp_2 | PF08442 | 22 | 862 | 160 aa | 37% |   | ATP-grasp domain |
| ATP-grasp_3 | PF02655 | 18 | 240 | 166 aa | 19% |   | ATP-grasp domain |
| ATP-gua_Ptrans | PF00217 | 6 | 783 | 152 aa | 50% | 1crk | ATP:guanido phosphotransferase, C-terminal catalytic domain |
| ATP-gua_PtransN | PF02807 | 6 | 691 | 70 aa | 65% | 1crk | ATP:guanido phosphotransferase, N-terminal domain |
| ATP-sulfurylase | PF01747 | 19 | 267 | 303 aa | 35% | 1i2d | ATP-sulfurylase |
| ATP-synt | PF00231 | 18 | 830 | 272 aa | 33% | 1bmf | ATP synthase |
| ATP-synt_10 | PF05176 | 3 | 25 | 143 aa | 40% |   | ATP10 protein |
| ATP-synt_8 | PF00895 | 66 | 3190 | 53 aa | 40% |   | ATP synthase protein 8 |
| ATP-synt_A | PF00119 | 30 | 6220 | 195 aa | 43% | 1c17 | ATP synthase A chain |
| ATP-synt_ab | PF00006 | 152 | 7798 | 209 aa | 47% | 1bmf | ATP synthase alpha/beta family, nucleotide-binding domain |
| ATP-synt_ab_C | PF00306 | 151 | 5752 | 96 aa | 43% | 1bmf | ATP synthase alpha/beta chain, C terminal domain |
| ATP-synt_ab_N | PF02874 | 196 | 6055 | 64 aa | 40% | 1bmf | ATP synthase alpha/beta family, beta-barrel domain |
| ATP-synt_B | PF00430 | 27 | 913 | 130 aa | 23% | 1b9u | ATP synthase B/B' CF(0) |
| ATP-synt_C | PF00137 | 35 | 1738 | 66 aa | 29% | 1aty | ATP synthase subunit C |
| ATP-synt_D | PF01813 | 18 | 214 | 187 aa | 33% |   | ATP synthase subunit D |
| ATP-synt_DE | PF00401 | 16 | 567 | 47 aa | 36% | 1aqt | ATP synthase, Delta/Epsilon chain, long alpha-helix domain |
| ATP-synt_DE_N | PF02823 | 20 | 923 | 81 aa | 32% | 1aqt | ATP synthase, Delta/Epsilon chain, beta-sandwich domain |
| ATP-synt_E | PF05680 | 18 | 46 | 75 aa | 36% |   | ATP synthase E chain |
| ATP-synt_Eps | PF04627 | 9 | 56 | 48 aa | 42% | 1e79 | Mitochondrial ATP synthase epsilon chain |
| ATP-synt_E_2 | PF08112 | 2 | 4 | 43 aa | 55% |   | ATP synthase epsilon subunit |
| ATP-synt_F | PF01990 | 14 | 151 | 94 aa | 30% |   | ATP synthase (F/14-kDa) subunit |
| ATP-synt_F6 | PF05511 | 4 | 30 | 88 aa | 48% |   | Mitochondrial ATP synthase coupling factor 6 |
| ATP-synt_G | PF04718 | 7 | 59 | 102 aa | 32% |   | Mitochondrial ATP synthase g subunit |
| ATP-synt_J | PF04911 | 2 | 14 | 54 aa | 46% |   | ATP synthase j chain |
| ATP-synt_S1 | PF05827 | 4 | 45 | 286 aa | 48% |   | Vacuolar ATP synthase subunit S1 (ATP6S1) |
| ATP11 | PF06644 | 5 | 48 | 238 aa | 29% |   | ATP11 protein |
| ATP12 | PF07542 | 11 | 104 | 136 aa | 32% |   | ATP12 chaperone protein |
| ATP1G1_PLM_MAT8 | PF02038 | 8 | 54 | 52 aa | 45% |   | ATP1G1/PLM/MAT8 family |
| ATPase_gene1 | PF09527 | 30 | 42 | 60 aa | 42% |   | Putative F0F1-ATPase subunit (ATPase_gene1) |
| ATP_bind_1 | PF03029 | 32 | 337 | 215 aa | 27% |   | Conserved hypothetical ATP binding protein |
| ATP_bind_2 | PF03668 | 4 | 379 | 277 aa | 41% |   | P-loop ATPase protein family |
| ATP_bind_3 | PF01171 | 33 | 1157 | 146 aa | 29% | 1ni5 | PP-loop family |
| ATP_bind_4 | PF01902 | 6 | 166 | 209 aa | 32% | 1ru8 | ATP-binding region |
| ATP_synt_H | PF05493 | 10 | 57 | 63 aa | 44% |   | ATP synthase subunit H |
| ATP_synt_I | PF03899 | 5 | 100 | 119 aa | 36% |   | ATP synthase I chain |
| Atracotoxin | PF05353 | 2 | 7 | 42 aa | 65% | 1qdp | Delta Atracotoxin |
| Atrophin-1 | PF03154 | 3 | 41 | 461 aa | 46% |   | Atrophin-1 family |
| ATS3 | PF06232 | 5 | 23 | 124 aa | 48% |   | Embryo-specific protein 3, (ATS3) |
| Attacin_C | PF03769 | 10 | 67 | 110 aa | 36% |   | Attacin, C-terminal region |
| Attacin_N | PF03768 | 14 | 50 | 63 aa | 41% |   | Attacin, N-terminal region |
| Attractin | PF08037 | 2 | 5 | 54 aa | 65% |   | Attractin family |
| ATX_III | PF08098 | 2 | 5 | 17 aa | 60% |   | Anemonia sulcata toxin III family |
| AT_hook | PF02178 | 43 | 1596 | 13 aa | 47% | 2eze | AT hook motif |
| Aurora-A_bind | PF09041 | 4 | 15 | 61 aa | 57% |   | Aurora-A binding |
| Autoind_bind | PF03472 | 45 | 450 | 140 aa | 23% | 1h0m | Autoinducer binding domain |
| Autoind_synth | PF00765 | 13 | 258 | 171 aa | 30% | 1kzf | Autoinducer synthetase |
| Autophagy_C | PF03987 | 7 | 97 | 123 aa | 36% |   | Autophagocytosis associated protein, C-terminal domain |
| Autophagy_N | PF03986 | 6 | 62 | 128 aa | 42% |   | Autophagocytosis associated protein, N-terminal domain |
| Autotransporter | PF03797 | 216 | 1497 | 241 aa | 15% | 1uyn | Autotransporter beta-domain |
| Auto_anti-p27 | PF06677 | 15 | 61 | 41 aa | 38% |   | Sjogren's syndrome/scleroderma autoantigen 1 (Autoantigen p27) |
| Auxin_BP | PF02041 | 4 | 45 | 148 aa | 70% | 1lr5 | Auxin binding protein |
| Auxin_inducible | PF02519 | 14 | 230 | 95 aa | 33% |   | Auxin responsive protein |
| Auxin_repressed | PF05564 | 12 | 51 | 103 aa | 40% |   | Dormancy/auxin associated protein |
| Auxin_resp | PF06507 | 17 | 134 | 80 aa | 45% |   | Auxin response factor |
| AUX_IAA | PF02309 | 11 | 242 | 179 aa | 36% |   | AUX/IAA family |
| Avian_gp85 | PF03708 | 4 | 113 | 214 aa | 62% |   | Avian retrovirus envelope protein, gp85 |
| Avidin | PF01382 | 6 | 30 | 111 aa | 34% | 1slf | Avidin family |
| Avirulence | PF03377 | 8 | 150 | 441 aa | 66% |   | Xanthomonas avirulence protein, Avr/PthA |
| AvrB_AvrC | PF05394 | 4 | 15 | 307 aa | 49% | 1nh1 | Avirulence protein |
| AvrD | PF05655 | 2 | 22 | 266 aa | 69% |   | Pseudomonas avirulence D protein (AvrD) |
| AvrPphF-ORF-2 | PF09143 | 3 | 8 | 159 aa | 48% | 1s21 | AvrPphF-ORF-2 |
| AvrPtoB-E3_ubiq | PF09046 | 4 | 8 | 124 aa | 82% |   | AvrPtoB E3 ubiquitin ligase |
| Av_adeno_fibre | PF06536 | 5 | 9 | 94 aa | 47% |   | Avian adenovirus fibre |
| AWPM-19 | PF05512 | 8 | 18 | 133 aa | 52% |   | AWPM-19-like family |
| AXE1 | PF05448 | 11 | 78 | 246 aa | 34% | 1l7a | Acetyl xylan esterase (AXE1) |
| AXH | PF08517 | 5 | 31 | 114 aa | 43% |   | Ataxin-1 and HBP1 module (AXH) |
| Axin_b-cat_bind | PF08833 | 7 | 33 | 36 aa | 61% |   | Axin beta-catenin binding domain |
| AzlC | PF03591 | 78 | 384 | 141 aa | 27% |   | AzlC protein |
| AzlD | PF05437 | 64 | 331 | 97 aa | 22% |   | Branched-chain amino acid transport protein (AzlD) |
| A_amylase_inhib | PF01356 | 6 | 11 | 65 aa | 51% | 1hoe | Alpha amylase inhibitor |
| A_deamin | PF02137 | 7 | 149 | 276 aa | 33% |   | Adenosine-deaminase (editase) domain |
| A_deaminase | PF00962 | 17 | 647 | 332 aa | 21% | 1add | Adenosine/AMP deaminase |
| A_deaminase_N | PF08451 | 19 | 45 | 97 aa | 29% |   | Adenosine/AMP deaminase N-terminal |
| A_thal_3526 | PF09713 | 13 | 40 | 50 aa | 48% |   | Plant protein 1589 of unknown function (A_thal_3526) |
Available sections: Numbers A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Top twenty families