Browse through the Pfam families on this page.

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O-ag_pol_Wzy PF14296.1 O-antigen polysaccharide polymerase Wzy

O-antigen_lig PF13425.1 O-antigen ligase like membrane protein

O-FucT PF10250.4 GDP-fucose protein O-fucosyltransferase

OAD_beta PF03977.8 Na+-transporting oxaloacetate decarboxylase beta subunit

OAD_gamma PF04277.8 Oxaloacetate decarboxylase, gamma chain

OAF PF14941.1 Transcriptional regulator, Out at first

OapA PF04225.7 Opacity-associated protein A LysM-like domain

OapA_N PF08525.6 Opacity-associated protein A N-terminal motif

OAR PF03826.12 OAR domain

OAS1_C PF10421.4 2'-5'-oligoadenylate synthetase 1, domain 2, C-terminus

OATP PF03137.15 Organic Anion Transporter Polypeptide (OATP) family

OB_NTP_bind PF07717.11 Oligonucleotide/oligosaccharide-binding (OB)-fold

OB_RNB PF08206.6 Ribonuclease B OB domain

OCC1 PF15506.1 OCC1 family

Occludin_ELL PF07303.8 Occludin homology domain

OCD_Mu_crystall PF02423.10 Ornithine cyclodeaminase/mu-crystallin family

OCIA PF07051.6 Ovarian carcinoma immunoreactive antigen (OCIA)

Ocnus PF05005.10 Janus/Ocnus family (Ocnus)

Octapeptide PF03373.9 Octapeptide repeat

Octopine_DH PF02317.12 NAD/NADP octopine/nopaline dehydrogenase, alpha-helical domain

Ocular_alb PF02101.10 Ocular albinism type 1 protein

ODAM PF15424.1 Odontogenic ameloblast-associated family

ODC_AZ PF02100.12 Ornithine decarboxylase antizyme

ODR4-like PF14778.1 Olfactory receptor 4-like

ODV-E18 PF10717.4 Occlusion-derived virus envelope protein ODV-E18

OEP PF02321.13 Outer membrane efflux protein

Oest_recep PF02159.10 Oestrogen receptor

Ofd1_CTDD PF10637.4 Oxoglutarate and iron-dependent oxygenase degradation C-term

OGFr_III PF04680.8 Opioid growth factor receptor repeat

OGFr_N PF04664.8 Opioid growth factor receptor (OGFr) conserved region

OGG_N PF07934.7 8-oxoguanine DNA glycosylase, N-terminal domain

Ogr_Delta PF04606.7 Ogr/Delta-like zinc finger

OHA PF14418.1 OST-HTH Associated domain

OHCU_decarbox PF09349.5 OHCU decarboxylase

OKR_DC_1 PF01276.15 Orn/Lys/Arg decarboxylase, major domain

OKR_DC_1_C PF03711.10 Orn/Lys/Arg decarboxylase, C-terminal domain

OKR_DC_1_N PF03709.10 Orn/Lys/Arg decarboxylase, N-terminal domain

Ole-e-6 PF09253.5 Pollen allergen ole e 6

Oleosin PF01277.12 Oleosin

OLF PF02191.11 Olfactomedin-like domain

Olfactory_mark PF06554.7 Olfactory marker protein

Oligomerisation PF02410.10 Oligomerisation domain

OmdA PF13376.1 Bacteriocin-protection, YdeI or OmpD-Associated

Omega-toxin PF06357.6 Omega-atracotoxin

Omega_Repress PF07764.6 Omega Transcriptional Repressor

Omp28 PF11551.3 Outer membrane protein Omp28

OmpA PF00691.15 OmpA family

OmpA_membrane PF01389.12 OmpA-like transmembrane domain

OMPdecase PF00215.19 Orotidine 5'-phosphate decarboxylase / HUMPS family

OmpH PF03938.9 Outer membrane protein (OmpH-like)

Omptin PF01278.15 Omptin family

OmpW PF03922.9 OmpW family

OMP_b-brl PF13505.1 Outer membrane protein beta-barrel domain

OMP_b-brl_2 PF13568.1 Outer membrane protein beta-barrel domain

OMP_b-brl_3 PF14905.1 Outer membrane protein beta-barrel family

OMS28_porin PF03532.8 OMS28 porin

OPA3 PF07047.7 Optic atrophy 3 protein (OPA3)

Opacity PF02462.10 Opacity family porin protein

OpcA PF07239.6 Outer membrane protein OpcA

OpcA_G6PD_assem PF10128.4 Glucose-6-phosphate dehydrogenase subunit

OpgC_C PF10129.4 OpgC protein

Opi1 PF08618.5 Transcription factor Opi1

Opiods_neuropep PF01160.13 Vertebrate endogenous opioids neuropeptide

OppC_N PF12911.2 N-terminal TM domain of oligopeptide transport permease C

OprB PF04966.7 Carbohydrate-selective porin, OprB family

OprD PF03573.8 outer membrane porin, OprD family

OprF PF05736.6 OprF membrane domain

OPT PF03169.10 OPT oligopeptide transporter protein

Optomotor-blind PF11078.3 Optomotor-blind protein N-terminal region

OpuAC PF04069.7 Substrate binding domain of ABC-type glycine betaine transport system

Opy2 PF09463.5 Opy2 protein

Op_neuropeptide PF08035.6 Opioids neuropeptide

Orai-1 PF07856.7 Mediator of CRAC channel activity

Orbi_NS1 PF01718.11 Orbivirus non-structural protein NS1, or hydrophobic tubular protein

Orbi_NS3 PF01616.11 Orbivirus NS3

Orbi_VP1 PF05788.7 Orbivirus RNA-dependent RNA polymerase (VP1)

Orbi_VP2 PF00898.12 Orbivirus outer capsid protein VP2

Orbi_VP3 PF01700.11 Orbivirus VP3 (T2) protein

Orbi_VP4 PF05059.7 Orbivirus VP4 core protein

Orbi_VP5 PF00901.12 Orbivirus outer capsid protein VP5

Orbi_VP6 PF01516.11 Orbivirus helicase VP6

Orbi_VP7 PF00897.12 Orbivirus inner capsid protein VP7

ORC2 PF04084.9 Origin recognition complex subunit 2

ORC3_N PF07034.6 Origin recognition complex (ORC) subunit 3 N-terminus

ORC4_C PF14629.1 Origin recognition complex (ORC) subunit 4 C-terminus

ORC5_C PF14630.1 Origin recognition complex (ORC) subunit 5 C-terminus

ORC6 PF05460.8 Origin recognition complex subunit 6 (ORC6)

Orexin PF02072.10 Prepro-orexin

Orexin_rec2 PF03827.8 Orexin receptor type 2

ORF11CD3 PF10549.4 ORF11CD3 domain

ORF6C PF10552.4 ORF6C domain

ORF6N PF10543.4 ORF6N domain

OrfB_IS605 PF01385.14 Probable transposase

OrfB_Zn_ribbon PF07282.6 Putative transposase DNA-binding domain

OrgA_MxiK PF09482.5 Bacterial type III secretion apparatus protein (OrgA_MxiK)

ORMDL PF04061.9 ORMDL family

Ornatin PF02088.10 Ornatin

Orn_Arg_deC_N PF02784.11 Pyridoxal-dependent decarboxylase, pyridoxal binding domain

Orn_DAP_Arg_deC PF00278.17 Pyridoxal-dependent decarboxylase, C-terminal sheet domain

Orthopox_35kD PF02250.10 35kD major secreted virus protein

Orthopox_A36R PF05950.6 Orthopoxvirus A36R protein

Orthopox_A43R PF06517.6 Orthopoxvirus A43R protein

Orthopox_A47 PF06334.6 Orthopoxvirus A47 protein

Orthopox_A49R PF06489.6 Orthopoxvirus A49R protein

Orthopox_A5L PF06193.6 Orthopoxvirus A5L protein-like

Orthopox_B11R PF07033.6 Orthopoxvirus B11R protein

Orthopox_C10L PF07020.6 Orthopoxvirus C10L protein

Orthopox_F14 PF06076.7 Orthopoxvirus F14 protein

Orthopox_F6 PF06601.7 Orthopoxvirus F6 protein

Orthopox_F7 PF05813.7 Orthopoxvirus F7 protein

Orthopox_F8 PF05886.6 Orthopoxvirus F8 protein

Orthoreo_P10 PF07204.6 Orthoreovirus membrane fusion protein p10

Orthoreo_P17 PF07272.6 Orthoreovirus P17 protein

OS-D PF03392.8 Insect pheromone-binding family, A10/OS-D

OSCP PF00213.13 ATP synthase delta (OSCP) subunit

Oscp1 PF10188.4 Organic solute transport protein 1

OsmC PF02566.14 OsmC-like protein

Osmo_CC PF08946.5 Osmosensory transporter coiled coil

Osmo_MPGsynth PF09488.5 Mannosyl-3-phosphoglycerate synthase (osmo_MPGsynth)

OspD PF03207.8 Borrelia outer surface protein D (OspD)

OspE PF02471.12 Borrelia outer surface protein E

OSR1_C PF12202.3 Oxidative-stress-responsive kinase 1 C terminal

OST-HTH PF12872.2 OST-HTH/LOTUS domain

OST3_OST6 PF04756.8 OST3 / OST6 family

Ost4 PF10215.4 Oligosaccaryltransferase

OstA PF03968.9 OstA-like protein

OstA_2 PF13100.1 OstA-like protein

OstA_C PF04453.9 Organic solvent tolerance protein

OSTbeta PF15048.1 Organic solute transporter subunit beta protein

Osteopontin PF00865.13 Osteopontin

Osteoregulin PF07175.6 Osteoregulin

OSTMP1 PF09777.4 Osteopetrosis-associated transmembrane protein 1 precursor

OTCace PF00185.19 Aspartate/ornithine carbamoyltransferase, Asp/Orn binding domain

OTCace_N PF02729.16 Aspartate/ornithine carbamoyltransferase, carbamoyl-P binding domain

Otopetrin PF03189.8 Otopetrin

OTOS PF15182.1 Otospiralin

OTT_1508_deam PF14441.1 OTT_1508-like deaminase

OTU PF02338.14 OTU-like cysteine protease

Ovate PF04844.8 Transcriptional repressor, ovate

Oxidored-like PF09791.4 Oxidoreductase-like protein, N-terminal

Oxidored_FMN PF00724.15 NADH:flavin oxidoreductase / NADH oxidase family

Oxidored_molyb PF00174.14 Oxidoreductase molybdopterin binding domain

Oxidored_nitro PF00148.14 Nitrogenase component 1 type Oxidoreductase

Oxidored_q1 PF00361.15 NADH-Ubiquinone/plastoquinone (complex I), various chains

Oxidored_q1_C PF01010.14 NADH-Ubiquinone oxidoreductase (complex I) subunit C-terminus

Oxidored_q1_N PF00662.15 NADH-Ubiquinone oxidoreductase (complex I), chain 5 N-terminus

Oxidored_q2 PF00420.19 NADH-ubiquinone/plastoquinone oxidoreductase chain 4L

Oxidored_q3 PF00499.15 NADH-ubiquinone/plastoquinone oxidoreductase chain 6

Oxidored_q4 PF00507.14 NADH-ubiquinone/plastoquinone oxidoreductase, chain 3

Oxidored_q5_N PF01059.12 NADH-ubiquinone oxidoreductase chain 4, amino terminus

Oxidored_q6 PF01058.17 NADH ubiquinone oxidoreductase, 20 Kd subunit

OxoDH_E1alpha_N PF12573.3 2-oxoisovalerate dehydrogenase E1 alpha subunit N terminal

Oxygenase-NA PF09859.4 Oxygenase, catalysing oxidative methylation of damaged DNA

Oxysterol_BP PF01237.13 Oxysterol-binding protein

ocr PF08684.5 DNA mimic ocr

oligo_HPY PF08352.7 Oligopeptide/dipeptide transporter, C-terminal region

ox_reductase_C PF08635.5 Putative oxidoreductase C terminal