Calcium and integrin-binding protein 1 - Q99828 (CIB1_HUMAN)


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Calcium-binding protein that plays a role in the regulation of numerous cellular processes, such as cell differentiation, cell division, cell proliferation, cell migration, thrombosis, angiogenesis, cardiac hypertrophy and apoptosis. Involved in bone marrow megakaryocyte differentiation by negatively regulating thrombopoietin-mediated signaling pathway. Participates in the endomitotic cell cycle of megakaryocyte, a form of mitosis in which both karyokinesis and cytokinesis are interrupted. Plays a role in integrin signaling by negatively regulating alpha-IIb/beta3 activation in thrombin-stimulated megakaryocytes preventing platelet aggregation. Up-regulates PTK2/FAK1 activity, and is also needed for the recruitment of PTK2/FAK1 to focal adhesions; it thus appears to play an important role in focal adhesion formation. Positively regulates cell migration on fibronectin in a CDC42-dependent manner, the effect being negatively regulated by PAK1. Functions as a negative regulator of stress activated MAP kinase (MAPK) signaling pathways. Down-regulates inositol 1,4,5-trisphosphate receptor-dependent calcium signaling. Involved in sphingosine kinase SPHK1 translocation to the plasma membrane in a N-myristoylation-dependent manner preventing TNF-alpha-induced apoptosis. Regulates serine/threonine-protein kinase PLK3 activity for proper completion of cell division progression. Plays a role in microtubule (MT) dynamics during neuronal development; disrupts the MT depolymerization activity of STMN2 attenuating NGF-induced neurite outgrowth and the MT reorganization at the edge of lamellipodia. Promotes cardiomyocyte hypertrophy via activation of the calcineurin/NFAT signaling pathway. Stimulates calcineurin PPP3R1 activity by mediating its anchoring to the sarcolemma. In ischemia-induced (pathological or adaptive) angiogenesis, stimulates endothelial cell proliferation, migration and microvessel formation by activating the PAK1 and ERK1/ERK2 signaling pathway. Promotes also cancer cell survival and proliferation. May regulate cell cycle and differentiation of spermatogenic germ cells, and/or differentiation of supporting Sertoli cells. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Monomer. Interacts with MYO1C. Interacts (via C-terminal region) with PPP3R1 and CACNA1C; the interactions increase upon cardiomyocytes hypertrophy (By similarity). Interacts with the heterodimeric integrin alpha-IIb/beta3 (ITGA2B-ITGB3). Interacts with ITGA2B (via cytoplasmic domain); the interaction is direct and calcium-dependent. Interacts with the protein kinases PLK2/SNK and PRKDC (via the region immediately upstream of the kinase domain). Interacts with PLK3; the interaction inhibits PLK3 kinase activity. Interacts with PSEN2. Interacts (via C-terminus) with F8. Interacts with NBR1 (via C-terminus). Interacts with FEZ1 (via C-terminus). Interacts with UBR5 (via C-terminus); the interaction is sensitive to DNA damage, and may target CIB1 for ubiquitin-mediated degradation. Interacts with IFI6; the interaction is direct (PubMed:15685448). Interacts with BCL2 (PubMed:15685448). Interacts with ITPR3; the interaction occurs in a calcium-dependent manner. Interacts with PTK2/FAK1. Interacts with MAP3K5; the interaction inhibits MAP3K5 activation by phosphorylation, and its subsequent interaction with TRAF2. Isoform 2 interacts with PRKD2 (via N-terminal AP-rich region), PTK2/FAK1 and PAK1. Interacts with TAS1R2 (via C-terminus); the interaction is independent of the myristoylation state of CIB1. Interacts (via C-terminal region) with STMN2 (via the N-terminal region); the interaction is direct, occurs in a calcium-dependent manner and attenuates the STMN2-induced neurite outgrowth inhibition. Interacts with SPHK1, the interaction occurs in a calcium-dependent manner. Interacts with ITGA2B (via C-terminal cytoplasmic tail); the interaction occurs upon platelet aggregation and is stabilized/increased in a calcium and magnesium-dependent manner. Interacts with PAK1 (via N-terminal region); the interaction is direct and occurs in a calcium-dependent manner. Interacts with RAC3 (via C-terminal region); the interaction induces their association with the cytoskeleton upon alpha-IIb/beta3 integrin-mediated adhesion. Interacts with ITGA5 and ITGAV. UniProt
The EF-hands may also bind magnesium ions in the presence of high Mg(2+) levels and low Ca(2+) levels. UniProt
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