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Powering down the Pfam website
On October 5th, we began redirecting traffic from Pfam (pfam.xfam.org) to InterPro (www.ebi.ac.uk/interpro). The Pfam website will remain available at pfam-legacy.xfam.org until January 2023, when it will be decommissioned. You can read more about the sunset period in our blog post.

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Browse Pfam families

New Top twenty 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
ID Accession Type Number of sequences Average length Average %id Average coverage Has 3D Change status Description
Seed Full
O-ag_pol_Wzy PF14296 Family 19 290 396 13 84.59 Changed O-antigen polysaccharide polymerase Wzy
O-antigen_lig PF13425 Family 14 266 327.5 16 86.04 Changed O-antigen ligase like membrane protein
O-FucT PF10250 Family 153 11958 295.1 24 61.73 Changed GDP-fucose protein O-fucosyltransferase
OAD_beta PF03977 Family 180 2212 350 53 93.16 Changed Na+-transporting oxaloacetate decarboxylase beta subunit
OAD_gamma PF04277 Family 183 1597 76.1 23 54.75 Changed Oxaloacetate decarboxylase, gamma chain
OAF PF14941 Family 15 484 203.9 49 79.77 Changed Transcriptional regulator, Out at first
OAM_alpha PF16552 Domain 19 145 114.4 54 92.95 Changed D-ornithine 4,5-aminomutase alpha-subunit
OAM_dimer PF16554 Domain 52 583 77.8 44 20.68 Changed Dimerisation domain of d-ornithine 4,5-aminomutase
OapA PF04225 Domain 10 860 83.3 25 20.61 Changed Opacity-associated protein A LysM-like domain
OapA_N PF08525 Motif 33 363 28.5 35 8.43 Changed Opacity-associated protein A N-terminal motif
OAR PF03826 Motif 39 5395 18.8 55 5.78 Changed OAR motif
OAS1_C PF10421 Domain 91 1359 167.6 43 43.52 Changed 2'-5'-oligoadenylate synthetase 1, domain 2, C-terminus
OATP PF03137 Family 207 7313 433.9 27 79.81 Changed Organic Anion Transporter Polypeptide (OATP) family
Oberon_cc PF16312 Coiled-coil 23 764 126.9 42 16.56 Changed Coiled-coil region of Oberon
ObR_Ig PF18589 Domain 20 887 103.4 34 15.12 Changed Obesity receptor immunoglobulin like domain
OB_aCoA_assoc PF01796 Domain 87 6137 65.6 26 35.39 Changed DUF35 OB-fold domain, acyl-CoA-associated
OB_Dis3 PF17849 Domain 75 4380 72.2 38 7.04 Changed Dis3-like cold-shock domain 2 (CSD2)
OB_MalK PF17912 Domain 262 10520 52.3 32 14.15 Changed MalK OB fold domain
OB_NTP_bind PF07717 Domain 58 22876 84.4 26 8.11 Changed Oligonucleotide/oligosaccharide-binding (OB)-fold
OB_RNB PF08206 Domain 41 4690 58.6 32 7.72 Changed Ribonuclease B OB domain
OCC1 PF15506 Family 3 214 50.3 58 60.37 Changed OCC1 family
Occludin_ELL PF07303 Domain 89 2819 98.1 35 16.77 Changed Occludin homology domain
OCD_Mu_crystall PF02423 Family 7 8052 297.2 24 90.3 Changed Ornithine cyclodeaminase/mu-crystallin family
OCIA PF07051 Family 15 912 80 47 40.51 Changed Ovarian carcinoma immunoreactive antigen (OCIA)
Ocnus PF05005 Family 62 783 100.3 43 54.95 Changed Janus/Ocnus family (Ocnus)
ocr PF08684 Family 2 16 101 76 80.32 Changed DNA mimic ocr
OCRE PF17780 Domain 30 3543 51.5 41 6.84 Changed OCRE domain
OCRL_clath_bd PF16726 Domain 10 463 92.5 52 10.44 Changed Inositol polyphosphate 5-phosphatase clathrin binding domain
Octapeptide PF03373 Repeat 3 128 8 92 18.69 Changed Octapeptide repeat
Octopine_DH PF02317 Family 120 1025 151.2 24 40.35 Changed NAD/NADP octopine/nopaline dehydrogenase, alpha-helical domain
Ocular_alb PF02101 Family 9 449 324.3 45 91.94 Changed Ocular albinism type 1 protein
ODAM PF15424 Family 13 124 228.4 60 90.2 Changed Odontogenic ameloblast-associated family
ODAPH PF15848 Family 8 87 89.3 69 71.15 Changed Odontogenesis associated phosphoprotein
ODC_AZ PF02100 Family 54 1581 102.1 29 42.78 Changed Ornithine decarboxylase antizyme
ODP PF19583 Domain 139 562 195.3 39 67.34 Changed ODP family beta lactamase
ODR4-like PF14778 Family 51 1163 288.9 28 76.28 Changed Odorant response abnormal 4-like
ODV-E18 PF10717 Family 2 19 81.8 45 94.81 Changed Occlusion-derived virus envelope protein ODV-E18
OEP PF02321 Family 111 70486 186.4 15 72.97 Changed Outer membrane efflux protein
Oest_recep PF02159 Family 7 554 131 47 24.66 Changed Oestrogen receptor
OFCC1 PF15680 Family 10 245 103.3 66 18.07 Changed Orofacial cleft 1 candidate gene 1 protein
Ofd1_CTDD PF10637 Domain 28 1469 274.2 28 47.04 Changed Oxoglutarate and iron-dependent oxygenase degradation C-term
OFeT_1 PF16955 Family 7 84 203.8 29 86.36 Changed Ferrous iron uptake permease, iron-lead transporter
OGFr_III PF04680 Repeat 3 93 21.1 66 9.47 Changed Opioid growth factor receptor repeat
OGFr_N PF04664 Family 14 1222 181 42 47.8 Changed Opioid growth factor receptor (OGFr) conserved region
OGG_N PF07934 Family 54 2588 118.6 27 29.72 Changed 8-oxoguanine DNA glycosylase, N-terminal domain
Ogr_Delta PF04606 Family 24 416 46.6 32 49.59 Changed Ogr/Delta-like zinc finger
OHA PF14418 Domain 17 534 71.3 25 8.33 Changed OST-HTH Associated domain
OHCU_decarbox PF09349 Domain 244 4731 147.1 27 56.16 Changed OHCU decarboxylase
OKR_DC_1 PF01276 Domain 8 5324 341.3 29 61.55 Changed Orn/Lys/Arg decarboxylase, major domain
OKR_DC_1_C PF03711 Domain 83 4510 105.5 26 18.48 Changed Orn/Lys/Arg decarboxylase, C-terminal domain
OKR_DC_1_N PF03709 Domain 77 1399 117.5 31 16.01 Changed Orn/Lys/Arg decarboxylase, N-terminal domain
OLD-like_TOPRIM PF20469 Domain 651 2373 67.2 26 12 New Overcoming lysogenization defect protein-like, TOPRIM domain
Olduvai PF06758 Domain 23 1793 66.7 40 11.45 Changed Olduvai domain
Oleosin PF01277 Family 53 1357 107.1 36 58.47 Changed Oleosin
Ole_e_6 PF09253 Domain 8 126 38.1 44 41.13 Changed Pollen allergen Ole e 6
OLF PF02191 Repeat 110 8385 246.2 42 27.69 Changed Olfactomedin-like domain
Olfactory_mark PF06554 Family 8 214 149.6 64 78.1 Changed Olfactory marker protein
oligo_HPY PF08352 Family 38 58965 57.2 33 17.42 Changed Oligopeptide/dipeptide transporter, C-terminal region
OmdA PF13376 Family 290 5228 59.2 26 32.26 Changed Bacteriocin-protection, YdeI or OmpD-Associated
Omega-toxin PF06357 Family 2 2 34 23 55.28 Changed Omega-atracotoxin
Omega_Repress PF07764 Domain 1 24 67.9 81 91.47 Changed Omega Transcriptional Repressor
Omp28 PF11551 Family 16 358 177.4 18 38.6 Changed Outer membrane protein Omp28
Omp85 PF01103 Domain 44 13921 323.5 16 48.82 Changed Omp85 superfamily domain
Omp85_2 PF19143 Domain 113 555 332.3 25 45.23 Changed OMP85 superfamily
OmpA PF00691 Family 38 37023 97.5 27 27.33 Changed OmpA family
OmpA_like PF16961 Family 5 58 176.9 28 73.59 Changed Putative OmpA-OmpF-like porin family
OmpA_membrane PF01389 Domain 13 733 174.7 22 42.39 Changed OmpA-like transmembrane domain
OMPdecase PF00215 Domain 87 11385 225.3 23 79.87 Changed Orotidine 5'-phosphate decarboxylase / HUMPS family
OmpH PF03938 Domain 460 6226 140.2 19 73.57 Changed Outer membrane protein (OmpH-like)
Omptin PF01278 Family 11 200 255.1 21 79.94 Changed Omptin family
OmpW PF03922 Family 8 2179 191.8 29 85.66 Changed OmpW family
Omp_AT PF11557 Family 6 56 297.9 29 98 Changed Solitary outer membrane autotransporter beta-barrel domain
OMP_b-brl PF13505 Domain 55 11284 201.6 13 79.81 Changed Outer membrane protein beta-barrel domain
OMP_b-brl_2 PF13568 Domain 36 6851 180.1 15 71.28 Changed Outer membrane protein beta-barrel domain
OMP_b-brl_3 PF14905 Family 236 7630 384.2 16 49.22 Changed Outer membrane protein beta-barrel family
OMS28_porin PF03532 Family 1 1 253 100 98.44 Changed OMS28 porin
OPA1_C PF19434 Domain 53 1329 317.9 63 34.87 Changed Dynamin-like GTPase OPA1 C-terminal
OPA3 PF07047 Family 135 1876 129.2 33 57.78 Changed Optic atrophy 3 protein (OPA3)
Opacity PF02462 Family 4 85 140.5 29 65.04 Changed Opacity family porin protein
OpcA PF07239 Family 2 7 196 22 92.89 Changed Outer membrane protein OpcA
OpcA_G6PD_assem PF10128 Domain 130 1810 114 43 33.12 Changed Glucose-6-phosphate dehydrogenase subunit N-terminal domain
OpcA_G6PD_C PF20171 Domain 130 1808 137.5 40 40.05 New Glucose-6-phosphate dehydrogenase subunit C-terminal domain
OpgC_C PF10129 Family 38 1235 350.5 25 88.06 Changed OpgC protein
Opi1 PF08618 Family 4 1162 191.4 17 53.9 Changed Transcription factor Opi1
Opiods_neuropep PF01160 Family 43 781 45.2 38 18.62 Changed Vertebrate endogenous opioids neuropeptide
OppC_N PF12911 Domain 559 21570 53.8 22 16.58 Changed N-terminal TM domain of oligopeptide transport permease C
OprB PF04966 Family 33 2933 358.5 17 75.47 Changed Carbohydrate-selective porin, OprB family
OprD PF03573 Family 41 1386 371.3 25 88.02 Changed outer membrane porin, OprD family
OprF PF05736 Domain 4 115 175.3 38 52.92 Changed OprF membrane domain
OPT PF03169 Family 40 15351 527.5 21 84.14 Changed OPT oligopeptide transporter protein
Optomotor-blind PF11078 Family 3 78 80.8 66 11.16 Changed Optomotor-blind protein N-terminal region
OpuAC PF04069 Family 86 12352 244.5 19 75.25 Changed Substrate binding domain of ABC-type glycine betaine transport system
Opy2 PF09463 Family 61 533 35.2 41 7.81 Changed Opy2 protein
Op_neuropeptide PF08035 Family 10 306 28.8 69 12.16 Changed Opioids neuropeptide
Orai-1 PF07856 Family 28 1404 173.4 54 63.12 Changed Mediator of CRAC channel activity
Orbi_NS1 PF01718 Family 1 36 476.7 25 94.26 Changed Orbivirus non-structural protein NS1, or hydrophobic tubular protein
Orbi_NS3 PF01616 Family 1 36 183.6 30 80.52 Changed Orbivirus NS3
Orbi_VP1 PF05788 Family 1 35 1242.4 51 98.75 Changed Orbivirus RNA-dependent RNA polymerase (VP1)
Orbi_VP2 PF00898 Family 25 27 574 17 66.75 Changed Orbivirus outer capsid protein VP2
Orbi_VP3 PF01700 Family 1 34 883.2 48 97.54 Changed Orbivirus VP3 (T2) protein
Orbi_VP4 PF05059 Family 1 34 636.5 47 99.18 Changed Orbivirus VP4 core protein
Orbi_VP5 PF00901 Family 1 34 506.7 39 96.26 Changed Orbivirus outer capsid protein VP5
Orbi_VP6 PF01516 Family 2 38 168.3 29 59.66 Changed Orbivirus helicase VP6
Orbi_VP7 PF00897 Family 1 34 332.7 34 98.44 Changed Orbivirus inner capsid protein VP7
ORC2 PF04084 Family 132 1809 299.5 30 60.72 Changed Origin recognition complex subunit 2
ORC3_ins PF19675 Family 9 819 205.9 40 32.79 Changed Origin recognition complex subunit 3 insertion domain
ORC3_N PF07034 Domain 19 2132 242.3 22 41.13 Changed Origin recognition complex (ORC) subunit 3 N-terminus
ORC4_C PF14629 Family 129 1647 198.4 23 35.89 Changed Origin recognition complex (ORC) subunit 4 C-terminus
ORC5_C PF14630 Family 134 1777 270.9 25 51.72 Changed Origin recognition complex (ORC) subunit 5 C-terminus
ORC6 PF05460 Family 27 1116 194.8 22 60.74 Changed Origin recognition complex subunit 6 (ORC6)
ORC_WH_C PF18137 Domain 58 2252 90 28 17.59 Changed Origin recognition complex winged helix C-terminal
Orexin PF02072 Family 4 211 119.4 51 79.41 Changed Prepro-orexin
Orexin_rec2 PF03827 Family 4 255 52 63 11.78 Changed Orexin receptor type 2
ORF11CD3 PF10549 Domain 6 110 52.5 35 29.79 Changed ORF11CD3 domain
ORF45 PF17620 Family 1 4 195.2 65 99.11 Changed Family of unknown function
ORF6C PF10552 Domain 13 420 109.5 22 47.81 Changed ORF6C domain
ORF6N PF10543 Domain 117 1244 85 36 38.85 Changed ORF6N domain
Orf78 PF06024 Family 23 21 100.1 23 70.76 Changed Orf78 (ac78)
OrfA PF17495 Family 3 0 0 0 0 Changed Vpr-like OrfA
OrfB_IS605 PF01385 Family 23 8757 118.4 24 31.42 Changed Probable transposase
OrfB_Zn_ribbon PF07282 Family 54 11226 69.1 31 19.12 Changed Putative transposase DNA-binding domain
ORF_12_N PF18042 Domain 20 158 90.4 28 21.18 Changed ORF 12 gene product N-terminal
ORF_2_N PF18492 Domain 10 61 117.2 19 69.41 Changed Open reading frame 2 N-terminal domain
Organ_specific PF10950 Family 6 924 76.3 27 84.58 Changed Organ specific protein
OrgA_MxiK PF09482 Family 6 61 165.7 24 88.51 Changed Bacterial type III secretion apparatus protein (OrgA_MxiK)
ORMDL PF04061 Family 74 2348 128.9 49 72.48 Changed ORMDL family
Ornatin PF02088 Family 2 0 0 0 0 Changed Ornatin
Orn_Arg_deC_N PF02784 Domain 15 19587 241.6 25 53.4 Changed Pyridoxal-dependent decarboxylase, pyridoxal binding domain
Orn_DAP_Arg_deC PF00278 Domain 430 17889 330.9 12 76.62 Changed Pyridoxal-dependent decarboxylase, C-terminal sheet domain
OrsD PF12013 Family 13 1093 103.3 21 14.95 Changed Orsellinic acid/F9775 biosynthesis cluster protein D
Orthopox_35kD PF02250 Domain 4 26 197 34 84.9 Changed 35kD major secreted virus protein
Orthopox_A36R PF05950 Family 2 10 155.6 73 72.71 Changed Orthopoxvirus A36R protein
Orthopox_A43R PF06517 Family 2 10 193.4 71 99.54 Changed Orthopoxvirus A43R protein
Orthopox_A47 PF06334 Family 2 12 213.8 57 97.53 Changed Orthopoxvirus A47 protein
Orthopox_A49R PF06489 Family 2 10 133.8 65 99.11 Changed Orthopoxvirus A49R protein
Orthopox_A5L PF06193 Family 2 27 149.3 25 89.38 Changed Orthopoxvirus A5L protein-like
Orthopox_B11R PF07033 Family 1 5 71.6 87 83.06 Changed Orthopoxvirus B11R protein
Orthopox_C10L PF07020 Family 2 7 60.4 73 95.49 Changed Orthopoxvirus C10L protein
Orthopox_F14 PF06076 Family 2 8 72.8 84 100 Changed Orthopoxvirus F14 protein
Orthopox_F6 PF06601 Family 2 10 71.7 71 94.84 Changed Orthopoxvirus F6 protein
Orthopox_F7 PF05813 Family 2 10 72.9 75 89.78 Changed Orthopoxvirus F7 protein
Orthopox_F8 PF05886 Family 2 16 59.1 50 90.69 Changed Orthopoxvirus F8 protein
Orthoreo_P10 PF07204 Family 3 63 76.5 23 18.6 Changed Orthoreovirus membrane fusion protein p10
Orthoreo_P17 PF07272 Family 6 2 143 28 100 Changed Orthoreovirus P17 protein
OS-D PF03392 Family 119 1270 88.5 34 61.8 Changed Insect pheromone-binding family, A10/OS-D
OSCP PF00213 Family 120 10264 165 25 78.17 Changed ATP synthase delta (OSCP) subunit
Oscp1 PF10188 Family 31 832 163.5 55 46.21 Changed Organic solute transport protein 1
OSK PF17182 Domain 10 92 183.2 27 41.86 Changed OSK domain
OsmC PF02566 Family 103 19121 100.5 20 59.33 Changed OsmC-like protein
Osmo_CC PF08946 Coiled-coil 11 155 47 58 9.7 Changed Osmosensory transporter coiled coil
Osmo_MPGsynth PF09488 Family 22 107 367 38 82.54 Changed Mannosyl-3-phosphoglycerate synthase (osmo_MPGsynth)
OspD PF03207 Family 1 1 254 100 98.83 Changed Borrelia outer surface protein D (OspD)
OspE PF02471 Family 3 4 106 69 52.54 Changed Borrelia outer surface protein E
OSR1_C PF12202 Domain 26 5225 60.3 42 4.51 Changed Oxidative-stress-responsive kinase 1 C-terminal domain
OST-HTH PF12872 Domain 130 11235 69.7 19 17.89 Changed OST-HTH/LOTUS domain
OST3_OST6 PF04756 Family 173 3177 239.3 27 81.58 Changed OST3 / OST6 family, transporter family
Ost4 PF10215 Family 48 837 33.7 47 40.85 Changed Oligosaccaryltransferase
Ost5 PF05251 Family 161 1211 69.3 41 52.68 Changed Oligosaccharyltransferase subunit 5
OstA_2 PF13100 Family 7 1182 138.4 27 28.82 Changed OstA-like protein
OSTbeta PF15048 Family 17 213 122.5 34 62.97 Changed Organic solute transporter subunit beta protein
Osteopontin PF00865 Family 12 284 221.5 49 85.72 Changed Osteopontin
Osteoregulin PF07175 Family 12 158 158.5 64 30.74 Changed Osteoregulin
OSTMP1 PF09777 Family 14 490 211.1 37 73.41 Changed Osteopetrosis-associated transmembrane protein 1 precursor
OST_IS PF18246 Domain 2 3 84.3 31 8.83 Changed Oligosaccharyltransferase Insert domain
OST_P2 PF18235 Domain 3 4 132.2 46 13.69 Changed Oligosaccharyltransferase Peripheral 2 domain
Osw5 PF17062 Family 12 32 69.7 38 36.78 Changed Outer spore wall 5
OTCace PF00185 Domain 43 20318 153.7 29 34.16 Changed Aspartate/ornithine carbamoyltransferase, Asp/Orn binding domain
OTCace_N PF02729 Domain 1247 20404 142.1 36 31.56 Changed Aspartate/ornithine carbamoyltransferase, carbamoyl-P binding domain
Otopetrin PF03189 Family 45 3932 220.3 17 64.53 Changed Otopetrin
OTOS PF15182 Family 5 311 65.3 54 67.12 Changed Otospiralin
OTT_1508_deam PF14441 Family 172 1656 65.4 29 12.22 Changed OTT_1508-like deaminase
OTU PF02338 Family 13 11298 126.4 20 24.45 Changed OTU-like cysteine protease
Ovate PF04844 Family 141 3631 58.4 43 21.6 Changed Transcriptional repressor, ovate
Oxidored-like PF09791 Family 68 2107 44 36 20.53 Changed Oxidoreductase-like protein, N-terminal
Oxidoreduct_C PF16490 Domain 16 178 274 48 59.75 Changed Putative oxidoreductase C terminal domain
Oxidored_FMN PF00724 Domain 7 29326 316.3 27 72.12 Changed NADH:flavin oxidoreductase / NADH oxidase family
Oxidored_molyb PF00174 Domain 536 14151 158.9 27 39.6 Changed Oxidoreductase molybdopterin binding domain
Oxidored_nitro PF00148 Domain 67 6544 393.3 20 83.36 Changed Nitrogenase component 1 type Oxidoreductase
Oxidored_q2 PF00420 Family 61 11703 98.7 29 85.26 Changed NADH-ubiquinone/plastoquinone oxidoreductase chain 4L
Oxidored_q3 PF00499 Family 661 6979 145 30 71.39 Changed NADH-ubiquinone/plastoquinone oxidoreductase chain 6
Oxidored_q4 PF00507 Family 366 7148 100.2 39 78.93 Changed NADH-ubiquinone/plastoquinone oxidoreductase, chain 3
Oxidored_q5_N PF01059 Family 143 1736 103.1 25 20.59 Changed NADH-ubiquinone oxidoreductase chain 4, amino terminus
Oxidored_q6 PF01058 Family 161 12830 120.6 41 52.24 Changed NADH ubiquinone oxidoreductase, 20 Kd subunit
OxoDH_E1alpha_N PF12573 Family 22 585 40.8 50 9.8 Changed 2-oxoisovalerate dehydrogenase E1 alpha subunit N terminal
OxoGdeHyase_C PF16870 Family 238 9916 144.1 38 14.61 Changed 2-oxoglutarate dehydrogenase C-terminal
OxRdtase_C PF19858 Domain 26 369 162 71 51.5 Changed Bacterial oxidoreductases, C-terminal
Oxygenase-NA PF09859 Domain 59 916 168.3 55 69.6 Changed Oxygenase, catalysing oxidative methylation of damaged DNA
Oxysterol_BP PF01237 Family 318 19244 293 27 48.66 Changed Oxysterol-binding protein
ox_reductase_C PF08635 Domain 6 384 132.1 48 30.53 Changed Putative oxidoreductase C terminal domain
O_anti_polymase PF01901 Family 17 86 300.8 20 85.27 Changed Putative O-antigen polymerase
O_Spanin_T7 PF17531 Family 8 36 60 52 61.22 Changed Spanin, outer lipoprotein subunit T7-like virus
New Top twenty 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