Glycoprotein Ib

Protein found in platelets From Wikipedia, the free encyclopedia

Glycoprotein Ib

Glycoprotein Ib (GPIb), also known as CD42,[1] is a component of the GPIb-V-IX complex on platelets. The GPIb-V-IX complex binds von Willebrand factor, allowing platelet adhesion and platelet plug formation at sites of vascular injury. Glycoprotein Ibα (GPIbα) is the major ligand-binding subunit of the GPIb-V-IX complex. GPIbα is heavily glycosylated.[2]

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It is deficient in the Bernard–Soulier syndrome. A gain-of-function mutation causes platelet-type von Willebrand disease.[3]

Autoantibodies against Ib/IX can be produced in immune thrombocytopenic purpura.[4]

Components include GP1BA and GP1BB.

It complexes with Glycoprotein IX.

References

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