Structural and functional implications of the intron/exon organization of the human endothelial cell protein C/activated protein C receptor (EPCR) gene: comparison with the structure of CD1/major histocompatibility complex alpha1 and alpha2 domains.

Abstract:

:The endothelial cell protein C/activated protein C receptor (EPCR) is located primarily on the surface of the large vessels of the vasculature. In vitro studies suggest that it is involved in the protein C anticoagulant pathway. We report the organization and nucleotide sequence of the human EPCR gene. It spans approximately 6 kbp of genomic DNA, with a transcription initiation point 79 bp upstream of the translation initiation (Met) codon in close proximity to a TATA box and other promoter element consensus sequences. The human EPCR gene has been localized to 20q11.2 and consists of four exons interrupted by three introns, all of which obey the GT-AG rule. Exon I encodes the 5' untranslated region and the signal peptide, and exon IV encodes the transmembrane domain, the cytoplasmic tail, and the 3' untranslated region. Exons II and III encode most of the extracellular region of the EPCR. These exons have been found to correspond to those encoding the alpha1 and alpha2 domains of the CD1/major histocompatibility complex (MHC) class I superfamily. Flanking and intervening introns are of the same phase (phase I) and the position of the intervening intron is identically located. Secondary structure prediction for the amino acid sequence of exons II and III corresponds well with the actual secondary structure elements determined for the alpha1 and alpha2 domains of HLA-A2 and murine CD1.1 from crystal structures. These findings suggest that the EPCR folds with a beta-sheet platform supporting two alpha-helical regions collectively forming a potential binding pocket for protein C/activated protein C.

journal_name

Blood

journal_title

Blood

authors

Simmonds RE,Lane DA

subject

Has Abstract

pub_date

1999-07-15 00:00:00

pages

632-41

issue

2

eissn

0006-4971

issn

1528-0020

journal_volume

94

pub_type

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