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- W1507789199 abstract "Cultured skin fibroblasts from a proband with an autosomal dominant variant of osteogenesis inperfecta were found to synthesize approximately equal amounts of normal pro-alpha 2(I) chains of type I procollagen and pro-alpha 2(I) chains which migrated more rapidly when examined by polyacrylamide gel electrophoresis in sodium dodecyl sulfate. The structural alteration was present in alpha 2(I)-CB4, a cyanogen bromide fragment containing amino acid residues 7-327 of the alpha 2 chain, and it appeared to be a deletion of about 30 amino acids. The pro-alpha 2(I) chains with the apparent deletion associated with normal pro-alpha 1(I) chains synthesized by the same fibroblasts and formed triple-helical type I procollagen. The presence of the altered pro-alpha 2 chains in trimers of procollagen had two consequences in terms of the physical properties of the molecule. One was to decrease the thermal stability of the protein as judged by resistance to proteolysis at 37 degrees C and by the helix to coil transition as assayed by circular dichroism. The second consequence was to make type I procollagen containing the shortened pro-alpha 2(I) chains resistant to digestion by procollagen N-proteinase. The simplest explanation for the data is that the apparent deletion in half the pro-alpha 2(I) chains produced a partial unfolding of the N-terminal region of type I procollagen which prevented processing of the protein by procollagen N-proteinase." @default.
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- W1507789199 title "A heterozygous defect for structurally altered pro-alpha 2 chain of type I procollagen in a mild variant of osteogenesis imperfecta. The altered structure decreases the thermal stability of procollagen and makes it resistant to procollagen N-proteinase." @default.
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- W1507789199 doi "https://doi.org/10.1016/s0021-9258(18)89861-1" @default.
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