Glycoprotein IX (platelet) (GP9) also known as CD42a (Cluster of Differentiation 42a), is a human
gene
In biology, the word gene has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protei ...
.
Platelet glycoprotein IX (GP9) is a small membrane glycoprotein found on the surface of human platelets. It forms a 1-to-1 noncovalent complex with
glycoprotein Ib (GP Ib), a platelet surface membrane glycoprotein complex that functions as a receptor for
von Willebrand factor
Von Willebrand factor (VWF) () is a blood glycoprotein that promotes primary hemostasis, specifically, platelet adhesion. It is deficient and/or defective in von Willebrand disease and is involved in many other diseases, including thrombotic thro ...
(VWF; MIM 193400) (known as the
Glycoprotein Ib-IX-V Receptor Complex
The GPIb-IX-V complex is a profuse membrane Cell surface receptor, receptor complex originating in megakaryocytes and exclusively functional on the surface of platelets. It primarily functions to mediate the first critical step in platelet adhesion ...
). The main portion of the receptor is a heterodimer composed of 2 polypeptide chains, an alpha chain (GP1BA; MIM 606672) and a beta chain (GP1BB; MIM 138720), that are linked by disulfide bonds. The complete receptor complex includes noncovalent association of the alpha and beta subunits with GP9 and platelet
glycoprotein V (GP5; MIM 173511).
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See also
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Cluster of differentiation
The cluster of differentiation (also known as cluster of designation or classification determinant and often abbreviated as CD) is a protocol used for the identification and investigation of cell surface molecules providing targets for immunophe ...
References
Further reading
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External links
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Clusters of differentiation
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