ID:FYN_HUMAN DESCRIPTION: RecName: Full=Tyrosine-protein kinase Fyn; EC=2.7.10.2; AltName: Full=Proto-oncogene Syn; AltName: Full=Proto-oncogene c-Fyn; AltName: Full=Src-like kinase; Short=SLK; AltName: Full=p59-Fyn; FUNCTION: Non-receptor tyrosine-protein kinase that plays a role in many biological processes including regulation of cell growth and survival, cell adhesion, integrin-mediated signaling, cytoskeletal remodeling, cell motility, immune response and axon guidance. Inactive FYN is phosphorylated on its C-terminal tail within the catalytic domain. Following activation by PKA, the protein subsequently associates with PTK2/FAK1, allowing PTK2/FAK1 phosphorylation, activation and targeting to focal adhesions. Involved in the regulation of cell adhesion and motility through phosphorylation of CTNNB1 (beta-catenin) and CTNND1 (delta- catenin). Regulates cytoskeletal remodeling by phosphorylating several proteins including the actin regulator WAS and the microtubule-associated proteins MAP2 and MAPT. Promotes cell survival by phosphorylating AGAP2/PIKE-A and preventing its apoptotic cleavage. Participates in signal transduction pathways that regulate the integrity of the glomerular slit diaphragm (an essential part of the glomerular filter of the kidney) by phosphorylating several slit diaphragm components including NPHS1, KIRREL and TRPC6. Plays a role in neural processes by phosphorylating DPYSL2, a multifunctional adapter protein within the central nervous system, ARHGAP32, a regulator for Rho family GTPases implicated in various neural functions, and SNCA, a small pre-synaptic protein. Participates in the downstream signaling pathways that lead to T-cell differentiation and proliferation following T-cell receptor (TCR) stimulation. Also participates in negative feedback regulation of TCR signaling through phosphorylation of PAG1, thereby promoting interaction between PAG1 and CSK and recruitment of CSK to lipid rafts. CSK maintains LCK and FYN in an inactive form. Promotes CD28-induced phosphorylation of VAV1. CATALYTIC ACTIVITY: ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. COFACTOR: Manganese. ENZYME REGULATION: Inhibited by phosphorylation of Tyr-531 by leukocyte common antigen and activated by dephosphorylation of this site. SUBUNIT: Interacts (via its SH3 domain) with PIK3R1 and PRMT8. Interacts with FYB, PAG1, and SH2D1A. Interacts with CD79A (tyrosine-phosphorylated form); the interaction increases FYN activity. Interacts (via SH2 domain) with CSF1R (tyrosine phosphorylated) (By similarity). Interacts with TOM1L1 (phosphorylated form). Interacts with KDR (tyrosine phosphorylated) (By similarity). Interacts with SH2D1A and SLAMF1. Interacts (via its SH3 domain) with HEV ORF3 protein. Interacts with ITCH; the interaction phosphorylates ITCH and negatively regulates its activity. Interacts with FASLG. Interacts with RUNX3. Interacts with KIT. Interacts with EPHA8; possible downstream effector of EPHA8 in regulation of cell adhesion. Interacts with PTK2/FAK1; this interaction leads to PTK2/FAK1 phosphorylation and activation. Interacts with CAV1; this interaction couples integrins to the Ras-ERK pathway. INTERACTION: O92972:- (xeno); NbExp=2; IntAct=EBI-515315, EBI-710506; P27958:- (xeno); NbExp=4; IntAct=EBI-515315, EBI-706378; Q9WMX2:- (xeno); NbExp=2; IntAct=EBI-515315, EBI-710918; P42684:ABL2; NbExp=2; IntAct=EBI-515315, EBI-1102694; A7KAX9:ARHGAP32; NbExp=4; IntAct=EBI-515315, EBI-308663; O14559:ARHGAP33; NbExp=2; IntAct=EBI-515315, EBI-1210010; Q9ULH1:ASAP1; NbExp=2; IntAct=EBI-515315, EBI-346622; Q8WX92:COBRA1; NbExp=2; IntAct=EBI-515315, EBI-347721; P50406:HTR6; NbExp=7; IntAct=EBI-515315, EBI-1182222; Q07666:KHDRBS1; NbExp=3; IntAct=EBI-515315, EBI-1364; Q92918:MAP4K1; NbExp=2; IntAct=EBI-515315, EBI-881; Q9H204:MED28; NbExp=5; IntAct=EBI-515315, EBI-514199; O43900:PRICKLE3; NbExp=2; IntAct=EBI-515315, EBI-1751761; Q05655:PRKCD; NbExp=4; IntAct=EBI-515315, EBI-704279; Q04759:PRKCQ; NbExp=7; IntAct=EBI-515315, EBI-374762; Q13905:RAPGEF1; NbExp=2; IntAct=EBI-515315, EBI-976876; SUBCELLULAR LOCATION: Cell membrane. Note=Present and active in lipid rafts. Palmitoylation is crucial for proper trafficking. TISSUE SPECIFICITY: Isoform 1 is highly expressed in the brain. Isoform 2 is expressed in cells of hemopoietic lineages, especially T-lymphocytes. PTM: Autophosphorylated at Tyr-420. Phosphorylation on the C- terminal tail at Tyr-531 by CSK maintains the enzyme in an inactive state (By similarity). PTPRC/CD45 dephosphorylates Tyr- 531 leading to activation. PTM: Palmitoylation at Cys-3 and Cys-6 regulates subcellular location (By similarity). SIMILARITY: Belongs to the protein kinase superfamily. Tyr protein kinase family. SRC subfamily. SIMILARITY: Contains 1 protein kinase domain. SIMILARITY: Contains 1 SH2 domain. SIMILARITY: Contains 1 SH3 domain.
The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.
ModBase Predicted Comparative 3D Structure on P06241
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Orthologous Genes in Other Species
Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
Biological Process: GO:0000165 MAPK cascade GO:0001764 neuron migration GO:0002223 stimulatory C-type lectin receptor signaling pathway GO:0002250 adaptive immune response GO:0002376 immune system process GO:0006468 protein phosphorylation GO:0006816 calcium ion transport GO:0007166 cell surface receptor signaling pathway GO:0007169 transmembrane receptor protein tyrosine kinase signaling pathway GO:0007275 multicellular organism development GO:0007411 axon guidance GO:0007417 central nervous system development GO:0007596 blood coagulation GO:0007612 learning GO:0007631 feeding behavior GO:0008360 regulation of cell shape GO:0010629 negative regulation of gene expression GO:0010976 positive regulation of neuron projection development GO:0014068 positive regulation of phosphatidylinositol 3-kinase signaling GO:0016032 viral process GO:0016310 phosphorylation GO:0016477 cell migration GO:0018108 peptidyl-tyrosine phosphorylation GO:0019221 cytokine-mediated signaling pathway GO:0030154 cell differentiation GO:0030168 platelet activation GO:0030900 forebrain development GO:0031295 T cell costimulation GO:0031397 negative regulation of protein ubiquitination GO:0035556 intracellular signal transduction GO:0036120 cellular response to platelet-derived growth factor stimulus GO:0038083 peptidyl-tyrosine autophosphorylation GO:0038096 Fc-gamma receptor signaling pathway involved in phagocytosis GO:0042110 T cell activation GO:0042127 regulation of cell proliferation GO:0042177 negative regulation of protein catabolic process GO:0042493 response to drug GO:0042531 positive regulation of tyrosine phosphorylation of STAT protein GO:0042981 regulation of apoptotic process GO:0043123 positive regulation of I-kappaB kinase/NF-kappaB signaling GO:0043524 negative regulation of neuron apoptotic process GO:0045087 innate immune response GO:0045471 response to ethanol GO:0046777 protein autophosphorylation GO:0046854 phosphatidylinositol phosphorylation GO:0048010 vascular endothelial growth factor receptor signaling pathway GO:0048013 ephrin receptor signaling pathway GO:0048813 dendrite morphogenesis GO:0050690 regulation of defense response to virus by virus GO:0050730 regulation of peptidyl-tyrosine phosphorylation GO:0050798 activated T cell proliferation GO:0050852 T cell receptor signaling pathway GO:0050900 leukocyte migration GO:0050966 detection of mechanical stimulus involved in sensory perception of pain GO:0051897 positive regulation of protein kinase B signaling GO:0071363 cellular response to growth factor stimulus GO:0071375 cellular response to peptide hormone stimulus GO:0071560 cellular response to transforming growth factor beta stimulus GO:0090314 positive regulation of protein targeting to membrane GO:0097062 dendritic spine maintenance GO:1900182 positive regulation of protein localization to nucleus GO:1900449 regulation of glutamate receptor signaling pathway GO:1901216 positive regulation of neuron death GO:1902951 negative regulation of dendritic spine maintenance GO:1903997 positive regulation of non-membrane spanning protein tyrosine kinase activity GO:1904645 response to beta-amyloid GO:1905232 cellular response to L-glutamate GO:1905430 cellular response to glycine GO:1905477 positive regulation of protein localization to membrane GO:1905664 regulation of calcium ion import across plasma membrane GO:2001056 positive regulation of cysteine-type endopeptidase activity GO:2001240 negative regulation of extrinsic apoptotic signaling pathway in absence of ligand