Browse through the Pfam families on this page.
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| I-set | PF07679.11 | Immunoglobulin I-set domain |
| IalB | PF06776.7 | Invasion associated locus B (IalB) protein |
| IATP | PF04568.7 | Mitochondrial ATPase inhibitor, IATP |
| IBB | PF01749.15 | Importin beta binding domain |
| IBD | PF10416.4 | Transcription-initiator DNA-binding domain IBD |
| IBN_N | PF03810.14 | Importin-beta N-terminal domain |
| IBP39 | PF11422.3 | Initiator binding protein 39 kDa |
| IBR | PF01485.16 | IBR domain |
| Ibs_toxin | PF13956.1 | Toxin Ibs, type I toxin-antitoxin system |
| IBV_3A | PF03617.8 | IBV 3A protein |
| IBV_3B | PF03622.8 | IBV 3B protein |
| IBV_3C | PF03620.8 | IBV 3C protein |
| ICA69 | PF04629.9 | Islet cell autoantigen ICA69, C-terminal domain |
| ICAM_N | PF03921.9 | Intercellular adhesion molecule (ICAM), N-terminal domain |
| ICAP-1_inte_bdg | PF10480.4 | Beta-1 integrin binding protein |
| ICAT | PF06384.6 | Beta-catenin-interacting protein ICAT |
| ICE2 | PF08426.5 | ICE2 |
| ICEA | PF05315.6 | ICEA Protein |
| IceA2 | PF05862.6 | Helicobacter pylori IceA2 protein |
| Ice_nucleation | PF00818.12 | Ice nucleation protein repeat |
| ICL | PF00463.16 | Isocitrate lyase family |
| IclR | PF01614.13 | Bacterial transcriptional regulator |
| IcmF-related | PF06761.7 | Intracellular multiplication and human macrophage-killing |
| IcmL | PF11393.3 | Macrophage killing protein with similarity to conjugation protein |
| ICMT | PF04140.9 | Isoprenylcysteine carboxyl methyltransferase (ICMT) family |
| IDEAL | PF08858.5 | IDEAL domain |
| IDH | PF03971.9 | Monomeric isocitrate dehydrogenase |
| IDO | PF01231.13 | Indoleamine 2,3-dioxygenase |
| IER | PF05760.7 | Immediate early response protein (IER) |
| IF-2 | PF11987.3 | Translation-initiation factor 2 |
| IF-2B | PF01008.12 | Initiation factor 2 subunit family |
| IF2_assoc | PF08364.6 | Bacterial translation initiation factor IF-2 associated region |
| IF2_N | PF04760.10 | Translation initiation factor IF-2, N-terminal region |
| IF3_C | PF00707.17 | Translation initiation factor IF-3, C-terminal domain |
| IF3_N | PF05198.11 | Translation initiation factor IF-3, N-terminal domain |
| IF4E | PF01652.13 | Eukaryotic initiation factor 4E |
| Ifi-6-16 | PF06140.8 | Interferon-induced 6-16 family |
| IFN-gamma | PF00714.12 | Interferon gamma |
| IFNGR1 | PF07140.6 | Interferon gamma receptor (IFNGR1) |
| IFP_35_N | PF07334.8 | Interferon-induced 35 kDa protein (IFP 35) N-terminus |
| IFR3_antag | PF14754.1 | Papain-like auto-proteinase |
| IFRD | PF05004.8 | Interferon-related developmental regulator (IFRD) |
| IFRD_C | PF04836.7 | Interferon-related protein conserved region |
| IFT20 | PF14931.1 | Intraflagellar transport complex B, subunit 20 |
| IFT43 | PF15305.1 | Intraflagellar transport protein 43 |
| IFT46_B_C | PF12317.3 | Intraflagellar transport complex B protein 46 C terminal |
| IFT57 | PF10498.4 | Intra-flagellar transport protein 57 |
| IgaA | PF07095.6 | Intracellular growth attenuator protein IgaA |
| IGF2_C | PF08365.6 | Insulin-like growth factor II E-peptide |
| IGFBP | PF00219.13 | Insulin-like growth factor binding protein |
| IGFL | PF14653.1 | Insulin growth factor-like family |
| IgG_binding_B | PF01378.12 | B domain |
| IglC | PF11550.3 | Intracellular growth locus C protein |
| IGPD | PF00475.13 | Imidazoleglycerol-phosphate dehydratase |
| IGPS | PF00218.16 | Indole-3-glycerol phosphate synthase |
| IGR | PF09597.5 | IGR protein motif |
| Ig_2 | PF13895.1 | Immunoglobulin domain |
| Ig_3 | PF13927.1 | Immunoglobulin domain |
| Ig_J_chain | PF15097.1 | Immunoglobulin J chain |
| Ig_Tie2_1 | PF10430.4 | Tie-2 Ig-like domain 1 |
| IIGP | PF05049.8 | Interferon-inducible GTPase (IIGP) |
| IKI3 | PF04762.7 | IKI3 family |
| IKKbetaNEMObind | PF12179.3 | I-kappa-kinase-beta NEMO binding domain |
| IL1 | PF00340.14 | Interleukin-1 / 18 |
| IL10 | PF00726.12 | Interleukin 10 |
| IL11 | PF07400.6 | Interleukin 11 |
| IL12 | PF03039.9 | Interleukin-12 alpha subunit |
| IL12p40_C | PF10420.4 | Cytokine interleukin-12p40 C-terminus |
| IL13 | PF03487.8 | Interleukin-13 |
| IL15 | PF02372.10 | Interleukin 15 |
| IL17 | PF06083.6 | Interleukin-17 |
| IL17_R_N | PF15037.1 | Interleukin-17 receptor extracellular region |
| IL1_propep | PF02394.11 | Interleukin-1 propeptide |
| IL2 | PF00715.12 | Interleukin 2 |
| IL22 | PF14565.1 | Interleukin 22 IL-10-related T-cell-derived-inducible factor |
| IL28A | PF15177.1 | Interleukin-28A |
| IL3 | PF02059.10 | Interleukin-3 |
| IL31 | PF15209.1 | Interleukin 31 |
| IL32 | PF15225.1 | Interleukin 32 |
| IL33 | PF15095.1 | Interleukin 33 |
| IL34 | PF15036.1 | Interleukin 34 |
| IL4 | PF00727.13 | Interleukin 4 |
| IL4Ra_N | PF09238.5 | Interleukin-4 receptor alpha chain, N-terminal |
| IL5 | PF02025.10 | Interleukin 5 |
| IL6 | PF00489.12 | Interleukin-6/G-CSF/MGF family |
| IL6Ra-bind | PF09240.5 | Interleukin-6 receptor alpha chain, binding |
| IL7 | PF01415.11 | Interleukin 7/9 family |
| IL8 | PF00048.15 | Small cytokines (intecrine/chemokine), interleukin-8 like |
| Ilar_coat | PF01787.11 | Ilarvirus coat protein |
| Ilm1 | PF10311.4 | Increased loss of mitochondrial DNA protein 1 |
| IlvB_leader | PF08049.6 | IlvB leader peptide |
| IlvC | PF01450.14 | Acetohydroxy acid isomeroreductase, catalytic domain |
| ILVD_EDD | PF00920.16 | Dehydratase family |
| IlvGEDA_leader | PF08046.6 | IlvGEDA operon leader peptide |
| IlvN | PF07991.7 | Acetohydroxy acid isomeroreductase, catalytic domain |
| Ima1_N | PF09779.4 | Ima1 N-terminal domain |
| ImcF-related_N | PF14331.1 | ImcF-related N-terminal domain |
| IMCp | PF12314.3 | Inner membrane complex protein |
| IMD | PF08397.6 | IRSp53/MIM homology domain |
| Img2 | PF05046.9 | Mitochondrial large subunit ribosomal protein (Img2) |
| Imm-NTF2 | PF15655.1 | NTF2 fold immunity protein |
| Imm-NTF2-2 | PF15631.1 | NTF2 fold immunity protein |
| Imm1 | PF14430.1 | Immunity protein Imm1 |
| Imm10 | PF15562.1 | Immunity protein 10 |
| Imm11 | PF15563.1 | Immunity protein 11 |
| Imm12 | PF15589.1 | Immunity protein 12 |
| Imm13 | PF15564.1 | Immunity protein 13 |
| Imm14 | PF15428.1 | Immunity protein 14 |
| Imm15 | PF15590.1 | Immunity protein 15 |
| Imm16 | PF15565.1 | Immunity protein 16 |
| Imm17 | PF15591.1 | Immunity protein 17 |
| Imm18 | PF15566.1 | Immunity protein 18 |
| Imm19 | PF15567.1 | Immunity protein 19 |
| Imm2 | PF14426.1 | Immunity protein Imm2 |
| Imm20 | PF15568.1 | Immunity protein 20 |
| Imm21 | PF15569.1 | Immunity protein 21 |
| Imm22 | PF15592.1 | Immunity protein 22 |
| Imm23 | PF15593.1 | Immunity protein 23 |
| Imm24 | PF15570.1 | Immunity protein 24 |
| Imm25 | PF15571.1 | Immunity protein 25 |
| Imm26 | PF15572.1 | Immunity protein 26 |
| Imm27 | PF15573.1 | Immunity protein 27 |
| Imm28 | PF15574.1 | Immunity protein 28 |
| Imm29 | PF15575.1 | Immunity protein 29 |
| Imm3 | PF14425.1 | Immunity protein Imm3 |
| Imm30 | PF15594.1 | Immunity protein 30 |
| Imm31 | PF15595.1 | Immunity protein 31 |
| Imm32 | PF15579.1 | Immunity protein 32 |
| Imm33 | PF15580.1 | Immunity protein 33 |
| Imm34 | PF15596.1 | Immunity protein 34 |
| Imm35 | PF15581.1 | Immunity protein 35 |
| Imm36 | PF15597.1 | Immunity protein 36 |
| Imm37 | PF15598.1 | Immunity protein 37 |
| Imm38 | PF15599.1 | Immunity protein 38 |
| Imm39 | PF15600.1 | Immunity protein 39 |
| Imm40 | PF15582.1 | Immunity protein 40 |
| Imm41 | PF15583.1 | Immunity protein 41 |
| Imm42 | PF15601.1 | Immunity protein 42 |
| Imm43 | PF15602.1 | Immunity protein 43 |
| Imm44 | PF15584.1 | Immunity protein 44 |
| Imm45 | PF15603.1 | Immunity protein 45 |
| Imm46 | PF15585.1 | Immunity protein 46 |
| Imm47 | PF15586.1 | Immunity protein 47 |
| Imm48 | PF15587.1 | Immunity protein 48 |
| Imm49 | PF15660.1 | Immunity protein 49 |
| Imm5 | PF14423.1 | Immunity protein Imm5 |
| Imm6 | PF14434.1 | Immunity protein Imm6 |
| Imm7 | PF15588.1 | Immunity protein 7 |
| Imm8 | PF15560.1 | Immunity protein 8 |
| Imm9 | PF15561.1 | Immunity protein 9 |
| ImmE5 | PF11480.3 | Colicin-E5 Imm protein |
| Imm_superinfect | PF14373.1 | Superinfection immunity protein |
| Imp-YgjV | PF10688.4 | Bacterial inner membrane protein |
| ImpA-rel_N | PF06812.7 | ImpA-related N-terminal |
| IMPDH | PF00478.20 | IMP dehydrogenase / GMP reductase domain |
| ImpE | PF07024.8 | ImpE protein |
| IMP_cyclohyd | PF07826.6 | IMP cyclohydrolase-like protein |
| IMS | PF00817.15 | impB/mucB/samB family |
| IMS_C | PF11799.3 | impB/mucB/samB family C-terminal domain |
| IMS_HHH | PF11798.3 | IMS family HHH motif |
| InaF-motif | PF15018.1 | TRP-interacting helix |
| IncA | PF04156.9 | IncA protein |
| INCA1 | PF15142.1 | INCA1 |
| INCENP_ARK-bind | PF03941.10 | Inner centromere protein, ARK binding region |
| INCENP_N | PF12178.3 | Chromosome passenger complex (CPC) protein INCENP N terminal |
| IncFII_repA | PF02387.10 | IncFII RepA protein family |
| Indigoidine_A | PF04227.7 | Indigoidine synthase A like protein |
| ING | PF12998.2 | Inhibitor of growth proteins N-terminal histone-binding |
| Inh | PF02974.9 | Protease inhibitor Inh |
| Inhibitor_G39P | PF11417.3 | Loader and inhibitor of phage G40P |
| Inhibitor_I10 | PF12559.3 | Serine endopeptidase inhibitors |
| Inhibitor_I24 | PF10465.4 | PinA peptidase inhibitor |
| Inhibitor_I29 | PF08246.7 | Cathepsin propeptide inhibitor domain (I29) |
| Inhibitor_I34 | PF10466.4 | Saccharopepsin inhibitor I34 |
| Inhibitor_I36 | PF03995.8 | Peptidase inhibitor family I36 |
| Inhibitor_I42 | PF09394.5 | Chagasin family peptidase inhibitor I42 |
| Inhibitor_I48 | PF10467.4 | Peptidase inhibitor clitocypin |
| Inhibitor_I53 | PF11714.3 | Thrombin inhibitor Madanin |
| Inhibitor_I67 | PF11405.3 | Bromelain inhibitor VI |
| Inhibitor_I68 | PF10468.4 | Carboxypeptidase inhibitor I68 |
| Inhibitor_I69 | PF13734.1 | Spi protease inhibitor |
| Inhibitor_I71 | PF12628.2 | Falstatin, cysteine peptidase inhibitor |
| Inhibitor_I78 | PF11720.3 | Peptidase inhibitor I78 family |
| Inhibitor_I9 | PF05922.11 | Peptidase inhibitor I9 |
| Inhibitor_Mig-6 | PF11555.3 | EGFR receptor inhibitor Mig-6 |
| Init_tRNA_PT | PF04179.7 | Initiator tRNA phosphoribosyl transferase |
| Innate_immun | PF12782.2 | Invertebrate innate immunity transcript family |
| Innexin | PF00876.13 | Innexin |
| Ino80_Iec3 | PF14612.1 | IEC3 subunit of the Ino80 complex, chromatin re-modelling |
| INO80_Ies4 | PF08193.6 | INO80 complex subunit Ies4 |
| Inos-1-P_synth | PF01658.12 | Myo-inositol-1-phosphate synthase |
| Inositol_P | PF00459.20 | Inositol monophosphatase family |
| Inp1 | PF12634.2 | Inheritance of peroxisomes protein 1 |
| Ins134_P3_kin | PF05770.6 | Inositol 1, 3, 4-trisphosphate 5/6-kinase |
| Ins145_P3_rec | PF08709.6 | Inositol 1,4,5-trisphosphate/ryanodine receptor |
| INSIG | PF07281.7 | Insulin-induced protein (INSIG) |
| Insulin | PF00049.13 | Insulin/IGF/Relaxin family |
| Ins_allergen_rp | PF06757.8 | Insect allergen related repeat, nitrile-specifier detoxification |
| Ins_beta | PF03488.9 | Nematode insulin-related peptide beta type |
| Ins_P5_2-kin | PF06090.7 | Inositol-pentakisphosphate 2-kinase |
| Integrase_1 | PF12835.2 | Integrase |
| Integrase_AP2 | PF14657.1 | AP2-like DNA-binding integrase domain |
| Integrase_DNA | PF02920.10 | DNA binding domain of tn916 integrase |
| Integrase_Zn | PF02022.14 | Integrase Zinc binding domain |
| Integrin_alpha | PF00357.15 | Integrin alpha cytoplasmic region |
| Integrin_alpha2 | PF08441.7 | Integrin alpha |
| Integrin_beta | PF00362.13 | Integrin, beta chain |
| Integrin_b_cyt | PF08725.6 | Integrin beta cytoplasmic domain |
| Integrin_B_tail | PF07965.7 | Integrin beta tail domain |
| Intein_splicing | PF14890.1 | Intein splicing domain |
| Interfer-bind | PF09294.5 | Interferon-alpha/beta receptor, fibronectin type III |
| Interferon | PF00143.14 | Interferon alpha/beta domain |
| Internalin_N | PF12354.3 | Bacterial adhesion/invasion protein N terminal |
| Intg_mem_TP0381 | PF09529.5 | Integral membrane protein (intg_mem_TP0381) |
| Intimin_C | PF07979.6 | Intimin C-type lectin domain |
| Intron_maturas2 | PF01348.16 | Type II intron maturase |
| INTS2 | PF14750.1 | Integrator complex subunit 2 |
| INTS5_C | PF14838.1 | Integrator complex subunit 5 C-terminus |
| INTS5_N | PF14837.1 | Integrator complex subunit 5 N-terminus |
| INT_SG_DDX_CT_C | PF15300.1 | INTS6/SAGE1/DDX26B/CT45 C-terminus |
| Invasin_D3 | PF09134.5 | Invasin, domain 3 |
| Invas_SpaK | PF03519.9 | Invasion protein B family |
| InvH | PF04741.7 | InvH outer membrane lipoprotein |
| Involucrin | PF00904.12 | Involucrin repeat |
| Involucrin2 | PF06994.6 | Involucrin |
| Involucrin_N | PF10583.4 | Involucrin of squamous epithelia N-terminus |
| IN_DBD_C | PF00552.16 | Integrase DNA binding domain |
| Ion_trans | PF00520.26 | Ion transport protein |
| Ion_trans_2 | PF07885.11 | Ion channel |
| Ion_trans_N | PF08412.5 | Ion transport protein N-terminal |
| IpaB_EvcA | PF03278.8 | IpaB/EvcA family |
| IpaC_SipC | PF09599.5 | Salmonella-Shigella invasin protein C (IpaC_SipC) |
| IpaD | PF06511.6 | Invasion plasmid antigen IpaD |
| IpgD | PF05925.7 | Enterobacterial virulence protein IpgD |
| Ipi1_N | PF12333.3 | Rix1 complex component involved in 60S ribosome maturation |
| IPI_T4 | PF11634.3 | Nuclease inhibitor from bacteriophage T4 |
| IPK | PF03770.11 | Inositol polyphosphate kinase |
| IPP-2 | PF04979.9 | Protein phosphatase inhibitor 2 (IPP-2) |
| IPPT | PF01715.12 | IPP transferase |
| IPT | PF01745.11 | Isopentenyl transferase |
| IP_trans | PF02121.13 | Phosphatidylinositol transfer protein |
| IQ | PF00612.22 | IQ calmodulin-binding motif |
| IQ-like | PF15157.1 | IQ-like |
| IR1-M | PF12185.3 | Nup358/RanBP2 E3 ligase domain |
| IRF | PF00605.12 | Interferon regulatory factor transcription factor |
| IRF-2BP1_2 | PF11261.3 | Interferon regulatory factor 2-binding protein zinc finger |
| IRF-3 | PF10401.4 | Interferon-regulatory factor 3 |
| IRK | PF01007.15 | Inward rectifier potassium channel |
| IRK_N | PF08466.5 | Inward rectifier potassium channel N-terminal |
| Iron_permease | PF04120.7 | Low affinity iron permease |
| Iron_traffic | PF04362.9 | Bacterial Fe(2+) trafficking |
| Iron_transport | PF10634.4 | Fe2+ transport protein |
| IRS | PF02174.12 | PTB domain (IRS-1 type) |
| ISAV_HA | PF06215.6 | Infectious salmon anaemia virus haemagglutinin |
| ISG65-75 | PF11727.3 | Invariant surface glycoprotein |
| Ish1 | PF10281.4 | Putative stress-responsive nuclear envelope protein |
| ISK_Channel | PF02060.10 | Slow voltage-gated potassium channel |
| ISN1 | PF06437.6 | IMP-specific 5'-nucleotidase |
| Isochorismatase | PF00857.15 | Isochorismatase family |
| Iso_dh | PF00180.15 | Isocitrate/isopropylmalate dehydrogenase |
| IspA | PF04279.10 | Intracellular septation protein A |
| IspD | PF01128.14 | 2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase |
| Ist1 | PF03398.9 | Regulator of Vps4 activity in the MVB pathway |
| IstB_IS21 | PF01695.12 | IstB-like ATP binding protein |
| IstB_IS21_ATP | PF08483.6 | IstB-like ATP binding N-terminal |
| Isy1 | PF06246.7 | Isy1-like splicing family |
| ITAM | PF02189.10 | Immunoreceptor tyrosine-based activation motif |
| ITAM_Cys-rich | PF10538.4 | Immunoreceptor tyrosine-based activation motif |
| ITI_HC_C | PF06668.7 | Inter-alpha-trypsin inhibitor heavy chain C-terminus |
| IucA_IucC | PF04183.7 | IucA / IucC family |
| IU_nuc_hydro | PF01156.14 | Inosine-uridine preferring nucleoside hydrolase |
| Ivy | PF08816.6 | Inhibitor of vertebrate lysozyme (Ivy) |
| IZUMO | PF15005.1 | Izumo sperm-egg fusion |
| I_LWEQ | PF01608.12 | I/LWEQ domain |
| ig | PF00047.20 | Immunoglobulin domain |
| iPGM_N | PF06415.8 | BPG-independent PGAM N-terminus (iPGM_N) |