CD61 (GPIIIa, ITGB3) is a glycoprotein found on megakaryocytes, platelets and their precursors. CD61 antigen plays a role in platelet aggregation and also as a receptor for fibrinogen, fibronectin, von Willebrand factor and vitronectrin. CD61 is a 105 kDa glycoprotein that associates with either the alpha 11b integrin (CD41) or the alpha V integrin (CD51) at the cell surface. CD61 is expressed on platelets and megakaryocytes in association with CD41, and on endothelial cells, monocytes, platelets and osteoclasts in association with CD51. CD61 is a receptor for fibrinogen, fibronectin, Von Willebrand Factor, vitronectin and thrombospondin. The CD61 protein product is composed of an alpha chain and a beta chain. A given chain may combine with multiple partners resulting in different integrins. CD61 is found along with the alpha IIb chain in platelets. Like other integrins, CD61 is known to participate in cell adhesion as well as cell-surface mediated signaling. Diseases associated with CD61 dysfunction include Glanzmann Thrombasthenia and Platelet type-16 Bleeding Disorder.
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Protein Aliases: antigen CD61; CD61; GPIIIa; integrin beta 3; integrin beta 3 (Cd61); Integrin beta-3; integrin, beta 3 (platelet glycoprotein IIIa, antigen CD61); platelet gpIIIa; Platelet membrane glycoprotein IIIa
Gene Aliases: BDPLT16; BDPLT2; CD61; GP3A; GPIIIa; GT; INGRB3; ITGB3
Molecular Function: integrin