The cloning and sequencing of alpha 1(VIII) collagen cDNAs demonstrate that type VIII collagen is a short chain collagen and contains triple-helical and carboxyl-terminal non-triple-helical domains similar to those of type X collagen - PubMed (original) (raw)
. 1989 Sep 25;264(27):16022-9.
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- PMID: 2476437
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The cloning and sequencing of alpha 1(VIII) collagen cDNAs demonstrate that type VIII collagen is a short chain collagen and contains triple-helical and carboxyl-terminal non-triple-helical domains similar to those of type X collagen
N Yamaguchi et al. J Biol Chem. 1989.
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Abstract
We have isolated two overlapping cDNA clones covering 2425 base pairs encoding a short type VIII collagen chain synthesized by rabbit corneal endothelial cells. The cDNAs encode an open reading frame of 744 amino acid residues containing a triple-helical domain of 454 residues flanked by 117- and 173-residue amino and carboxyl non-triple-helical domains (called NC2 and NC1, respectively). Based on the identity between the DNA-derived amino acid sequence and the amino acid sequence of a type VIII collagen CNBr peptide obtained from rabbit corneal Descemet's membrane, we conclude that the cDNAs code for a type VIII collagen chain. We give this chain the designation alpha 1(VIII). The alpha 1(VIII) triple-helical domain contains eight imperfections in the Gly-X-Y repeated structure with Gly-X instead of a full triplet. The length of the triple-helical domain and number and relative locations of these imperfections are remarkably similar to those of chicken alpha 1(X) collagen. The amino acid sequence of the carboxyl three-quarters of the NC1 domain has high sequence similarity to that of alpha 1(X) collagen. These data suggest that the triple-helix coding portions and carboxyl three-quarters of the NC1 domains of the alpha 1(VIII) and alpha 1(X) genes have a common evolutionary origin.
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