Gpiibiiia (ITGA2B) Human Protein

ITGA2B encodes integrin alpha chain 2b. Integrins are heterodimeric integral membrane proteins composed of an alpha chain and a beta chain. Alpha chain 2b undergoes post-translational cleavage to yield disulfide-linked light and heavy chains that join with beta 3 to form a fibronectin receptor expressed in platelets that plays a crucial role in coagulation. Mutations that interfere with this role result in thrombasthenia. In addition to adhesion, integrins are known to participate in cell-surface mediated signalling. [provided by RefSeq, Jul 2008]

ITGA2B: Integrin alpha-IIb/beta-3 is a receptor for fibronectin, fibrinogen, plasminogen, prothrombin, thrombospondin and vitronectin. It recognizes the sequence R-G-D in a wide array of ligands. It recognizes the sequence H-H-L-G-G-G-A-K-Q-A-G-D-V in fibrinogen gamma chain. Following activation integrin alpha- IIb/beta-3 brings about platelet/platelet interaction through binding of soluble fibrinogen. This step leads to rapid platelet aggregation which physically plugs ruptured endothelial cell surface. Belongs to the integrin alpha chain family. Heterodimer of an alpha and a beta subunit. The alpha subunit is composed of an heavy and a light chain linked by a disulfide bond. Alpha-IIb associates with beta-3. Directly interacts with RNF181. 3 isoforms of the human protein are produced by alternative splicing.

Protein type: Membrane protein, integral; Motility/polarity/chemotaxis; Cell adhesion

Chromosomal Location of Human Ortholog: 17q21.32

Cellular Component: platelet alpha granule membrane; focal adhesion; cell surface; integral to plasma membrane; plasma membrane; integrin complex; external side of plasma membrane

Molecular Function: identical protein binding; protein binding; extracellular matrix binding; metal ion binding

Biological Process: integrin-mediated signaling pathway; platelet activation; axon guidance; extracellular matrix organization and biogenesis; platelet degranulation; positive regulation of leukocyte migration; cell-matrix adhesion; blood coagulation; cell adhesion

Disease: Glanzmann Thrombasthenia; Bleeding Disorder, Platelet-type, 16