Crystal structure of CIB1, an EF-hand, integrin and kinase-binding proteinCrystal structure of CIB1, an EF-hand, integrin and kinase-binding protein
Structural highlights
1xo5 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
CIB1_HUMAN May convert the inactive conformation of integrin alpha-IIb/beta3 to an active form through binding to the integrin cytoplasmic domain. Induces cell migration and spreading mediated through integrin (possibly via focal adhesion complexes). Functions as a negative regulator of stress activated MAP kinase (MAPK) signaling pathways. May play a role in regulation of apoptosis. Interacts with and up-regulates PTK2/FAK1 activity. Down regulates inositol 1,4,5-trisphosphate receptor-dependent calcium signaling. Participates in endomitotic cell cycle, a form of mitosis in which both karyokinesis and cytokinesis are interrupted and is a hallmark of megakaryocyte differentiation.[1][2][3][4][5][6]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
References
↑Naik UP, Naik MU. Association of CIB with GPIIb/IIIa during outside-in signaling is required for platelet spreading on fibrinogen. Blood. 2003 Aug 15;102(4):1355-62. Epub 2003 Apr 24. PMID:12714504 doi:10.1182/blood-2003-02-0591
↑Naik MU, Naik UP. Calcium-and integrin-binding protein regulates focal adhesion kinase activity during platelet spreading on immobilized fibrinogen. Blood. 2003 Nov 15;102(10):3629-36. Epub 2003 Jul 24. PMID:12881299 doi:10.1182/blood-2003-05-1703
↑Tahara E Jr, Tahara H, Kanno M, Naka K, Takeda Y, Matsuzaki T, Yamazaki R, Ishihara H, Yasui W, Barrett JC, Ide T, Tahara E. G1P3, an interferon inducible gene 6-16, is expressed in gastric cancers and inhibits mitochondrial-mediated apoptosis in gastric cancer cell line TMK-1 cell. Cancer Immunol Immunother. 2005 Aug;54(8):729-40. Epub 2005 Feb 1. PMID:15685448 doi:10.1007/s00262-004-0645-2
↑Hennigs JK, Burhenne N, Stahler F, Winnig M, Walter B, Meyerhof W, Schmale H. Sweet taste receptor interacting protein CIB1 is a general inhibitor of InsP3-dependent Ca2+ release in vivo. J Neurochem. 2008 Sep;106(5):2249-62. doi: 10.1111/j.1471-4159.2008.05563.x. PMID:18627437 doi:10.1111/j.1471-4159.2008.05563.x
↑Yoon KW, Cho JH, Lee JK, Kang YH, Chae JS, Kim YM, Kim J, Kim EK, Kim SE, Baik JH, Naik UP, Cho SG, Choi EJ. CIB1 functions as a Ca(2+)-sensitive modulator of stress-induced signaling by targeting ASK1. Proc Natl Acad Sci U S A. 2009 Oct 13;106(41):17389-94. doi:, 10.1073/pnas.0812259106. Epub 2009 Sep 29. PMID:19805025 doi:10.1073/pnas.0812259106
↑Kostyak JC, Naik UP. Calcium- and integrin-binding protein 1 regulates endomitosis and its interaction with Polo-like kinase 3 is enhanced in endomitotic Dami cells. PLoS One. 2011 Jan 14;6(1):e14513. doi: 10.1371/journal.pone.0014513. PMID:21264284 doi:10.1371/journal.pone.0014513
