Browse through the Pfam families on this page.
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| U-box | PF04564.10 | U-box domain |
| U1snRNP70_N | PF12220.3 | U1 small nuclear ribonucleoprotein of 70kDa MW N terminal |
| U3snoRNP10 | PF12397.3 | U3 small nucleolar RNA-associated protein 10 |
| U3_assoc_6 | PF08640.6 | U3 small nucleolar RNA-associated protein 6 |
| U3_snoRNA_assoc | PF08297.6 | U3 snoRNA associated |
| U5_2-snRNA_bdg | PF10597.4 | U5-snRNA binding site 2 of PrP8 |
| U6-snRNA_bdg | PF10596.4 | U6-snRNA interacting domain of PrP8 |
| U79_P34 | PF03064.11 | HSV U79 / HCMV P34 |
| UAA | PF08449.6 | UAA transporter family |
| UAE_UbL | PF14732.1 | Ubiquitin/SUMO-activating enzyme ubiquitin-like domain |
| UAF_Rrn10 | PF05234.6 | UAF complex subunit Rrn10 |
| Ub-Mut7C | PF14451.1 | Mut7-C ubiquitin |
| Ub-RnfH | PF03658.9 | RnfH family Ubiquitin |
| UB2H | PF14814.1 | Bifunctional transglycosylase second domain |
| UBA | PF00627.26 | UBA/TS-N domain |
| UBACT | PF02134.16 | Repeat in ubiquitin-activating (UBA) protein |
| UBA_2 | PF08587.6 | Ubiquitin associated domain (UBA) |
| UBA_3 | PF09288.5 | Fungal ubiquitin-associated domain |
| UBA_4 | PF14555.1 | UBA-like domain |
| UBA_e1_C | PF09358.5 | Ubiquitin-activating enzyme e1 C-terminal domain |
| UBA_e1_thiolCys | PF10585.4 | Ubiquitin-activating enzyme active site |
| UbiA | PF01040.13 | UbiA prenyltransferase family |
| UbiD | PF01977.11 | 3-octaprenyl-4-hydroxybenzoate carboxy-lyase |
| Ubie_methyltran | PF01209.13 | ubiE/COQ5 methyltransferase family |
| Ubiq-assoc | PF09145.5 | Ubiquitin-associated |
| Ubiq-Cytc-red_N | PF09165.5 | Ubiquinol-cytochrome c reductase 8 kDa, N-terminal |
| Ubiquitin_2 | PF14560.1 | Ubiquitin-like domain |
| Ubiquitin_3 | PF14836.1 | Ubiquitin-like domain |
| Ubiq_cyt_C_chap | PF03981.7 | Ubiquinol-cytochrome C chaperone |
| UBN2 | PF14223.1 | gag-polypeptide of LTR copia-type |
| UBN2_2 | PF14227.1 | gag-polypeptide of LTR copia-type |
| UBN2_3 | PF14244.1 | gag-polypeptide of LTR copia-type |
| UBN_AB | PF14075.1 | Ubinuclein conserved middle domain |
| UBX | PF00789.15 | UBX domain |
| UCH | PF00443.24 | Ubiquitin carboxyl-terminal hydrolase |
| UCH_1 | PF13423.1 | Ubiquitin carboxyl-terminal hydrolase |
| UCN2 | PF11613.3 | Agonist of corticotropin releasing factor R2, Urocortin-2 |
| UcrQ | PF02939.11 | UcrQ family |
| UCR_14kD | PF02271.11 | Ubiquinol-cytochrome C reductase complex 14kD subunit |
| UCR_6-4kD | PF08997.5 | Ubiquinol-cytochrome C reductase complex, 6.4kD protein |
| UCR_Fe-S_N | PF10399.4 | Ubiquitinol-cytochrome C reductase Fe-S subunit TAT signal |
| UCR_hinge | PF02320.11 | Ubiquinol-cytochrome C reductase hinge protein |
| UCR_TM | PF02921.9 | Ubiquinol cytochrome reductase transmembrane region |
| UCR_UQCRX_QCR9 | PF05365.7 | Ubiquinol-cytochrome C reductase, UQCRX/QCR9 like |
| UDG | PF03167.14 | Uracil DNA glycosylase superfamily |
| UDP-g_GGTase | PF06427.6 | UDP-glucose:Glycoprotein Glucosyltransferase |
| UDPGP | PF01704.13 | UTP--glucose-1-phosphate uridylyltransferase |
| UDPGT | PF00201.13 | UDP-glucoronosyl and UDP-glucosyl transferase |
| UDPG_MGDP_dh | PF00984.14 | UDP-glucose/GDP-mannose dehydrogenase family, central domain |
| UDPG_MGDP_dh_C | PF03720.10 | UDP-glucose/GDP-mannose dehydrogenase family, UDP binding domain |
| UDPG_MGDP_dh_N | PF03721.9 | UDP-glucose/GDP-mannose dehydrogenase family, NAD binding domain |
| Uds1 | PF15456.1 | Up-regulated During Septation |
| UEV | PF05743.8 | UEV domain |
| UFC1 | PF08694.6 | Ubiquitin-fold modifier-conjugating enzyme 1 |
| UFD1 | PF03152.9 | Ubiquitin fusion degradation protein UFD1 |
| Ufd2P_core | PF10408.4 | Ubiquitin elongating factor core |
| Ufm1 | PF03671.9 | Ubiquitin fold modifier 1 protein |
| UIM | PF02809.15 | Ubiquitin interaction motif |
| UK | PF02512.9 | Virulence determinant |
| UL11 | PF11094.3 | Membrane-associated tegument protein |
| UL2 | PF08196.6 | UL2 protein |
| UL40 | PF10682.4 | Glycoprotein of human cytomegalovirus HHV-5 |
| UL73_N | PF12522.3 | Cytomegalovirus glycoprotein N terminal |
| UL97 | PF06734.7 | UL97 |
| Uma2 | PF05685.7 | Putative restriction endonuclease |
| Umbravirus_LDM | PF04817.7 | Umbravirus long distance movement (LDM) family |
| UME | PF08064.8 | UME (NUC010) domain |
| UMP1 | PF05348.6 | Proteasome maturation factor UMP1 |
| UMPH-1 | PF05822.7 | Pyrimidine 5'-nucleotidase (UMPH-1) |
| UnbV_ASPIC | PF07593.7 | ASPIC and UnbV |
| UNC-50 | PF05216.8 | UNC-50 family |
| UNC-79 | PF14776.1 | Cation-channel complex subunit UNC-79 |
| UNC-93 | PF05978.11 | Ion channel regulatory protein UNC-93 |
| UNC119_bdg | PF15435.1 | UNC119-binding protein C5orf30 homologue |
| UNC45-central | PF11701.3 | Myosin-binding striated muscle assembly central |
| Unstab_antitox | PF09720.5 | Putative addiction module component |
| UN_NPL4 | PF11543.3 | Nuclear pore localisation protein NPL4 |
| UPAR_LY6 | PF00021.16 | u-PAR/Ly-6 domain |
| UPF0004 | PF00919.15 | Uncharacterized protein family UPF0004 |
| UPF0014 | PF03649.8 | Uncharacterised protein family (UPF0014) |
| UPF0016 | PF01169.14 | Uncharacterized protein family UPF0016 |
| UPF0020 | PF01170.13 | Putative RNA methylase family UPF0020 |
| UPF0029 | PF01205.14 | Uncharacterized protein family UPF0029 |
| UPF0047 | PF01894.12 | Uncharacterised protein family UPF0047 |
| UPF0051 | PF01458.12 | Uncharacterized protein family (UPF0051) |
| UPF0052 | PF01933.13 | Uncharacterised protein family UPF0052 |
| UPF0054 | PF02130.12 | Uncharacterized protein family UPF0054 |
| UPF0058 | PF01893.11 | Uncharacterised protein family UPF0058 |
| UPF0060 | PF02694.10 | Uncharacterised BCR, YnfA/UPF0060 family |
| UPF0061 | PF02696.9 | Uncharacterized ACR, YdiU/UPF0061 family |
| UPF0066 | PF01980.11 | Uncharacterised protein family UPF0066 |
| UPF0075 | PF03702.9 | Uncharacterised protein family (UPF0075) |
| UPF0079 | PF02367.12 | Uncharacterised P-loop hydrolase UPF0079 |
| UPF0081 | PF03652.10 | Uncharacterised protein family (UPF0081) |
| UPF0086 | PF01868.11 | Domain of unknown function UPF0086 |
| UPF0093 | PF03653.8 | Uncharacterised protein family (UPF0093) |
| UPF0102 | PF02021.12 | Uncharacterised protein family UPF0102 |
| UPF0104 | PF03706.8 | Uncharacterised protein family (UPF0104) |
| UPF0113 | PF03657.8 | Uncharacterised protein family (UPF0113) |
| UPF0114 | PF03350.11 | Uncharacterized protein family, UPF0114 |
| UPF0118 | PF01594.11 | Domain of unknown function DUF20 |
| UPF0121 | PF03661.8 | Uncharacterised protein family (UPF0121) |
| UPF0122 | PF04297.9 | Putative helix-turn-helix protein, YlxM / p13 like |
| UPF0126 | PF03458.8 | UPF0126 domain |
| UPF0128 | PF03673.8 | Uncharacterised protein family (UPF0128) |
| UPF0137 | PF03677.8 | Uncharacterised protein family (UPF0137) |
| UPF0139 | PF03669.8 | Uncharacterised protein family (UPF0139) |
| UPF0146 | PF03686.8 | Uncharacterised protein family (UPF0146) |
| UPF0147 | PF03685.8 | Uncharacterised protein family (UPF0147) |
| UPF0149 | PF03695.8 | Uncharacterised protein family (UPF0149) |
| UPF0150 | PF03681.10 | Uncharacterised protein family (UPF0150) |
| UPF0154 | PF03672.8 | Uncharacterised protein family (UPF0154) |
| UPF0158 | PF03682.8 | Uncharacterised protein family (UPF0158) |
| UPF0160 | PF03690.8 | Uncharacterised protein family (UPF0160) |
| UPF0164 | PF03687.8 | Uncharacterised protein family (UPF0164) |
| UPF0167 | PF03691.9 | Uncharacterised protein family (UPF0167) |
| UPF0172 | PF03665.8 | Uncharacterised protein family (UPF0172) |
| UPF0175 | PF03683.8 | Uncharacterised protein family (UPF0175) |
| UPF0179 | PF03684.8 | Uncharacterised protein family (UPF0179) |
| UPF0180 | PF03698.8 | Uncharacterised protein family (UPF0180) |
| UPF0181 | PF03701.9 | Uncharacterised protein family (UPF0181) |
| UPF0182 | PF03699.8 | Uncharacterised protein family (UPF0182) |
| UPF0183 | PF03676.9 | Uncharacterised protein family (UPF0183) |
| UPF0184 | PF03670.8 | Uncharacterised protein family (UPF0184) |
| UPF0193 | PF05250.6 | Uncharacterised protein family (UPF0193) |
| UPF0197 | PF05251.7 | Uncharacterised protein family (UPF0197) |
| UPF0203 | PF05254.7 | Uncharacterised protein family (UPF0203) |
| UPF0220 | PF05255.6 | Uncharacterised protein family (UPF0220) |
| UPF0223 | PF05256.7 | Uncharacterised protein family (UPF0223) |
| UPF0227 | PF05728.7 | Uncharacterised protein family (UPF0227) |
| UPF0228 | PF05727.6 | Uncharacterised protein family (UPF0228) |
| UPF0231 | PF06062.6 | Uncharacterised protein family (UPF0231) |
| UPF0233 | PF06781.7 | Uncharacterised protein family (UPF0233) |
| UPF0236 | PF06782.6 | Uncharacterised protein family (UPF0236) |
| UPF0239 | PF06783.6 | Uncharacterised protein family (UPF0239) |
| UPF0240 | PF06784.6 | Uncharacterised protein family (UPF0240) |
| UPF0242 | PF06785.6 | Uncharacterised protein family (UPF0242) |
| UPF0253 | PF06786.7 | Uncharacterised protein family (UPF0253) |
| UPF0254 | PF06787.6 | Uncharacterised protein family (UPF0254) |
| UPF0257 | PF06788.8 | Uncharacterised protein family (UPF0257) |
| UPF0258 | PF06789.7 | Uncharacterised protein family (UPF0258) |
| UPF0259 | PF06790.6 | Uncharacterised protein family (UPF0259) |
| UPF0261 | PF06792.6 | Uncharacterised protein family (UPF0261) |
| UPF0262 | PF06793.7 | Uncharacterised protein family (UPF0262) |
| UPF0270 | PF06794.7 | Uncharacterised protein family (UPF0270) |
| UPF0278 | PF08745.6 | UPF0278 family |
| UPF0300 | PF08594.5 | Uncharacterised protein family (UPF0300) |
| UPF0302 | PF08864.5 | UPF0302 domain |
| UPF0370 | PF13980.1 | Uncharacterised protein family (UPF0370) |
| UPF0444 | PF15475.1 | Transmembrane protein C12orf23, UPF0444 |
| UPF0449 | PF15136.1 | Uncharacterised protein family UPF0449 |
| UPF0489 | PF12640.2 | UPF0489 domain |
| UPF0506 | PF11703.3 | UPF0506 |
| UPF0515 | PF15135.1 | Uncharacterised protein UPF0515 |
| UPF0542 | PF15086.1 | Uncharacterised protein family UPF0542 |
| UPF0546 | PF10639.4 | Uncharacterised protein family UPF0546 |
| UPF0547 | PF10571.4 | Uncharacterised protein family UPF0547 |
| UPF0552 | PF10574.4 | Uncharacterised protein family UPF0552 |
| UPF0556 | PF10572.4 | Uncharacterised protein family UPF0556 |
| UPF0560 | PF10577.4 | Uncharacterised protein family UPF0560 |
| UPF0561 | PF10573.4 | Uncharacterised protein family UPF0561 |
| UPF0564 | PF10595.4 | Uncharacterised protein family UPF0564 |
| UPF0565 | PF10561.4 | Uncharacterised protein family UPF0565 |
| UPF0640 | PF15114.1 | Uncharacterised protein family UPF0640 |
| UPF0697 | PF15117.1 | Uncharacterised protein family UPF0697 |
| UPF0728 | PF15092.1 | Uncharacterised protein family UPF0728 |
| UPF0731 | PF14982.1 | UPF0731 family |
| UPF1_Zn_bind | PF09416.5 | RNA helicase (UPF2 interacting domain) |
| Upf2 | PF04050.9 | Up-frameshift suppressor 2 |
| UPRTase | PF14681.1 | Uracil phosphoribosyltransferase |
| UpxZ | PF06603.6 | UpxZ family of transcription anti-terminator antagonists |
| UQ_con | PF00179.21 | Ubiquitin-conjugating enzyme |
| Urb2 | PF10441.4 | Urb2/Npa2 family |
| Urease_alpha | PF00449.15 | Urease alpha-subunit, N-terminal domain |
| Urease_beta | PF00699.15 | Urease beta subunit |
| Urease_gamma | PF00547.13 | Urease, gamma subunit |
| UreD | PF01774.12 | UreD urease accessory protein |
| UreE_C | PF05194.7 | UreE urease accessory protein, C-terminal domain |
| UreE_N | PF02814.10 | UreE urease accessory protein, N-terminal domain |
| UreF | PF01730.11 | UreF |
| Ureide_permease | PF07168.6 | Ureide permease |
| Ureidogly_hydro | PF04115.7 | Ureidoglycolate hydrolase |
| Uricase | PF01014.13 | Uricase |
| Urm1 | PF09138.6 | Urm1 (Ubiquitin related modifier) |
| URO-D | PF01208.12 | Uroporphyrinogen decarboxylase (URO-D) |
| Urocanase | PF01175.13 | Urocanase |
| Uroplakin_II | PF07353.7 | Uroplakin II |
| Urotensin_II | PF02083.10 | Urotensin II |
| US2 | PF02476.10 | US2 family |
| US22 | PF02393.11 | US22 like |
| Use1 | PF09753.4 | Membrane fusion protein Use1 |
| Usg | PF06233.7 | Usg-like family |
| Usher | PF00577.15 | Outer membrane usher protein |
| Uso1_p115_C | PF04871.8 | Uso1 / p115 like vesicle tethering protein, C terminal region |
| Uso1_p115_head | PF04869.9 | Uso1 / p115 like vesicle tethering protein, head region |
| Usp | PF00582.21 | Universal stress protein family |
| USP7_C2 | PF14533.1 | Ubiquitin-specific protease C-terminal |
| USP7_ICP0_bdg | PF12436.3 | ICP0-binding domain of Ubiquitin-specific protease 7 |
| USP8_dimer | PF08969.6 | USP8 dimerisation domain |
| USP8_interact | PF08941.5 | USP8 interacting |
| UspB | PF10625.4 | Universal stress protein B (UspB) |
| Ustilago_mating | PF05722.7 | Ustilago B locus mating-type protein |
| UT | PF03253.9 | Urea transporter |
| Uteroglobin | PF01099.12 | Uteroglobin family |
| Utp11 | PF03998.8 | Utp11 protein |
| Utp12 | PF04003.7 | Dip2/Utp12 Family |
| Utp13 | PF08625.6 | Utp13 specific WD40 associated domain |
| Utp14 | PF04615.8 | Utp14 protein |
| UTP15_C | PF09384.5 | UTP15 C terminal |
| Utp21 | PF04192.7 | Utp21 specific WD40 associated putative domain |
| Utp8 | PF10395.4 | Utp8 family |
| UTRA | PF07702.8 | UTRA domain |
| UvdE | PF03851.9 | UV-endonuclease UvdE |
| UVR | PF02151.14 | UvrB/uvrC motif |
| UvrB | PF12344.3 | Ultra-violet resistance protein B |
| UvrC_HhH_N | PF08459.6 | UvrC Helix-hairpin-helix N-terminal |
| UvrD-helicase | PF00580.16 | UvrD/REP helicase N-terminal domain |
| UvrD_C | PF13361.1 | UvrD-like helicase C-terminal domain |
| UvrD_C_2 | PF13538.1 | UvrD-like helicase C-terminal domain |
| UvsW | PF11637.3 | ATP-dependant DNA helicase UvsW |
| UvsY | PF11056.3 | Recombination, repair and ssDNA binding protein UvsY |
| UxaC | PF02614.9 | Glucuronate isomerase |
| UXS1_N | PF11803.3 | UDP-glucuronate decarboxylase N-terminal |
| UxuA | PF03786.8 | D-mannonate dehydratase (UxuA) |
| ubiquitin | PF00240.18 | Ubiquitin family |
| uDENN | PF03456.13 | uDENN domain |