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== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/FYN_HUMAN FYN_HUMAN]] 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.<ref>PMID:7822789</ref> <ref>PMID:7568038</ref> <ref>PMID:11005864</ref> <ref>PMID:11162638</ref> <ref>PMID:11536198</ref> <ref>PMID:12788081</ref> <ref>PMID:12640114</ref> <ref>PMID:14761972</ref> <ref>PMID:15557120</ref> <ref>PMID:14707117</ref> <ref>PMID:15536091</ref> <ref>PMID:16387660</ref> <ref>PMID:16841086</ref> <ref>PMID:17194753</ref> <ref>PMID:18056706</ref> <ref>PMID:18258597</ref> <ref>PMID:19179337</ref> <ref>PMID:19652227</ref> <ref>PMID:20100835</ref> | [[http://www.uniprot.org/uniprot/FYN_HUMAN FYN_HUMAN]] 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.<ref>PMID:7822789</ref> <ref>PMID:7568038</ref> <ref>PMID:11005864</ref> <ref>PMID:11162638</ref> <ref>PMID:11536198</ref> <ref>PMID:12788081</ref> <ref>PMID:12640114</ref> <ref>PMID:14761972</ref> <ref>PMID:15557120</ref> <ref>PMID:14707117</ref> <ref>PMID:15536091</ref> <ref>PMID:16387660</ref> <ref>PMID:16841086</ref> <ref>PMID:17194753</ref> <ref>PMID:18056706</ref> <ref>PMID:18258597</ref> <ref>PMID:19179337</ref> <ref>PMID:19652227</ref> <ref>PMID:20100835</ref> | ||
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== Publication Abstract from PubMed == | |||
Interactions of proline-rich motifs with SH3 domains are present in signal transduction and other important cell processes. Analysis of structural and thermodynamic data suggest a relevant role of water molecules in these protein-protein interactions. To determine whether or not the SH3 domain of the Fyn tyrosine kinase shows the same behaviour, the crystal structures of its complexes with two high-affinity synthetic peptides, VSL12 and APP12, which are class I and II peptides, respectively, have been solved. In the class I complexes two water molecules were found at the binding interface that were not present in the class II complexes. The structures suggest a role of these water molecules in facilitating conformational changes in the SH3 domain to allow the binding of the class I or II peptides. In the third binding pocket these changes modify the cation-pi and salt-bridge interactions that determine the affinity of the binding. Comparison of the water molecules involved in the binding of the peptides with previous reported hydration spots suggests a different pattern for the SH3 domains of the Src tyrosine kinase family. | |||
The role of water molecules in the binding of class I and II peptides to the SH3 domain of the Fyn tyrosine kinase.,Camara-Artigas A, Ortiz-Salmeron E, Andujar-Sanchez M, Bacarizo J, Martin-Garcia JM Acta Crystallogr F Struct Biol Commun. 2016 Sep;72(Pt 9):707-12. doi:, 10.1107/S2053230X16012310. Epub 2016 Aug 26. PMID:27599862<ref>PMID:27599862</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
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== References == | == References == | ||
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