A defect in the structure of type I procollagen in a patient who had osteogenesis imperfecta: excess mannose in the COOH-terminal propeptide.
- 1 October 1980
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 77 (10), 6179-6183
- https://doi.org/10.1073/pnas.77.10.6179
Abstract
Fibroblasts from normal human subjects and from a patient who had osteogenesis imperfecta were incubated with [3H]mannose, and types I and III procollagens were isolated from the culture medium. The type I procollagen from the patient9s fibroblasts contained 2-3 time more [3H]mannose than the type I procollagen from the normal fibroblasts. In contrast, there was no difference in the [3H]mannose content of the type III procollagen simultaneously synthesized and secreted by the same cells. Isolation of a collagenase-resistant peptide fragment from the type I procollagen showed that the excess mannose was located in the COOH-terminal propeptide of the protein. Radioimmunoassays of the medium and the cell layer showed that the type I procollagen synthesized by the patient9s fibroblasts was secreted into the medium more slowly than the type I procollagen synthesized by normal fibroblasts. These results appear to provide evidence for an alteration in the structure of procollagen in osteogenesis imperfecta.This publication has 24 references indexed in Scilit:
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