Glycoprotein 5 (GP5) Antibody

Background

Glycoprotein V (GP5) is a key platelet membrane protein that functions as a part of the GPIb-IX-V complex, a receptor system primarily responsible for mediating platelet adhesion during vascular injury. This complex is crucial for the initial steps of platelet plug formation, which is essential in the process of hemostasis, particularly in the high-shear conditions of arterial blood flow. GP5 serves as an accessory component in the complex, complementing the roles of other glycoproteins like GPIbα (GP1BA), GPIbβ (GP1BB), and GPIX (GP9). The GPIb-IX-V complex, including GP5, binds to von Willebrand factor (vWF), which facilitates platelet tethering to the damaged endothelium under conditions of high shear stress. Although GP5 is not the primary binding site for vWF (that role belongs to GP1BA), it contributes to the structural integrity and function of the receptor. GP5 may also interact with other ligands and is thought to regulate the binding activity of the GPIb-IX-V complex.