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A point mutation in a type I procollagen gene converts glycine 748 of the alpha 1 chain to cysteine and destabilizes the triple helix in a lethal variant of osteogenesis imperfecta


A point mutation in a type I procollagen gene converts glycine 748 of the alpha 1 chain to cysteine and destabilizes the triple helix in a lethal variant of osteogenesis imperfecta



Journal of Biological Chemistry 262(30): 14737-14744



ISSN/ISBN: 0021-9258

PMID: 3667599

Synthesis of type I procollagen was examined in fibroblasts from a proband with a lethal perinatal variant of osteogenesis imperfecta. After trypsin digestion of the type I procollagen, a portion of the .alpha.1(I) chains was recovered as disulfide-linked dimers. Digestion of the protein with vertebrate collagenase and mapping of cyanogen bromide peptides suggested that a new cysteine residue was present between residues 551 and 775 of the .alpha.1(I) chain. Sequencing of cloned cDNAs prepared using mRNA from the proband's fibroblasts demonstrated that some of the clones contained a single base mutation that converted the glycine codon in amino acid position 748 of the .alpha.1(I) chain to a cysteine codon. About 80% of the type I procollagen synthesized by the proband's fibroblasts had a decreased thermal stability. The results, therefore, were consistent with the conclusion that normal pro-.alpha.1(I) chains and pro-.alpha.1(I) chains containing a cysteine residue in the .alpha. chain domain were synthesized in about equal amounts and incorporated randomly into type I procollagen. However, only about 10% of the .alpha.1(I) chains generated by trypsin digestion were disulfide-linked. Further studies demonstrated a decreased rate of secretion of type I procollagen containing the new cysteine residue and decreased processing of the protein by procollagen N-proteinase in cultures of postconfluent fibroblasts. Both parents were phenotypically normal and their fibroblasts synthesized only normal type I procollagen. Therefore, the mutation in the proband was a sporadic one and is very likely to have caused the connective tissue fragility that produced the lethal phenotype.

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Accession: 004608664

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Related references

A point mutation in a type I procollagen gene converts glycine 748 of the a1 chain to cysteine and destabilizes the triple helix in a lethal variant of osteogenesis imperfecta. The Journal of Biological Chemistry 262: 737-44, 1987

A point mutation in a type I procollagen gene converts glycine 748 of the α1 chain to cysteine and destabilizes the triple helix in a lethal variant of osteogenesis imperfecta. The Journal of Biological Chemistry 262(30): 14737-14744, 1987

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