Biochem Biophys Res Commun. 2000 Oct 14;277(1):27-36.

Molecular cloning, genomic structure, chromosomal localization, and alternative splice forms of the platelet collagen receptor glycoprotein VI.

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Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawaracho, Sakyo-ku, Kyoto, 606-8507, Japan.

Abstract

Glycoprotein VI (GPVI) is the major collagen receptor underlying platelet activation. We cloned the full-length cDNA for GPVI (GPVI-1) and its two isoforms (GPVI-2 and -3) from phorbol-ester-stimulated CMK cells. The GPVI-1 cDNA was identical in the coding region with the cDNA that has recently been reported to belong to the immunoglobulin superfamily. The GPVI gene consisted of 8 exons spanning over 23 kbp and was mapped on the chromosome 19q13. 4. The promoter of GPVI gene lacked TATA and CAAT boxes and had multiple transcription start sites like other megakaryocytic genes. When COS-7 cells were cotransfected with the GPVI isoforms and Fc receptor gamma chain, Fc receptor gamma chain was associated with GPVI-1 and -2 but did not affect the GPVI expression levels. GPVI-1 and -2 could bind the collagen-related peptide, which exhibits triple-helical and polymeric structure of collagen to activate platelets via GPVI.

PMID:: 11027634; [PubMed - indexed for MEDLINE]

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