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- W1536473284 abstract "Synthesis of procollagen was examined in skin fibroblasts from a patient with a moderately severe autosomal dominant form of osteogenesis imperfecta. Proteolytic removal of the propeptide regions of newly synthesized procollagen, followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under nonreducing conditions, revealed the presence of type I collagen in which two alpha 1(I) chains were linked through interchain disulfide bonds. Fragmentation of the disulfide-bonded alpha 1(I) dimers with vertebrate collagenase and cyanogen bromide demonstrated the presence of a cysteine residue in alpha 1(I)CB8, a fragment containing amino acid residues 124-402 of the alpha 1(I) collagen chain. Cysteine residues are not normally found in the triple-helical domain of type I collagen chains. The heterozygous nature of the molecular defect resulted in the formation of three kinds of type I trimers: a normal type with normal pro-alpha(I) chains, a type I trimer with one mutant pro-alpha 1(I) chain and two normal chains, and a type I trimer containing two mutant pro-alpha 1(I) chains and one normal pro-alpha 2(I) chain. The presence of one or two mutant pro-alpha 1(I) chains in trimers of type I procollagen was found to reduce the thermal stability of the protein by 2.5 and 1 degree C, respectively. In addition to post-translational overmodification, procollagen containing one mutant pro-alpha 1(I) chain was also cleared more slowly from cultured fibroblasts. The most likely explanation for these disruptive changes in the physical stability and secretion of the mutant procollagen is that a cysteine residue is substituted for a glycine in half of the pro-alpha 1(I) chains synthesized by the patient's fibroblasts." @default.
- W1536473284 created "2016-06-24" @default.
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- W1536473284 date "1986-07-01" @default.
- W1536473284 modified "2023-09-30" @default.
- W1536473284 title "The molecular defect in an autosomal dominant form of osteogenesis imperfecta. Synthesis of type I procollagen containing cysteine in the triple-helical domain of pro-alpha 1(I) chains." @default.
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- W1536473284 doi "https://doi.org/10.1016/s0021-9258(19)84487-3" @default.
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