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. 1982 Sep 15;206(3):499–503. doi: 10.1042/bj2060499

Regulation of proline 3-hydroxylation and prolyl 3-hydroxylase and 4-hydroxylase activities in transformed cells.

K Majamaa, R Myllylä, K Alitalo, A Vaheri
PMCID: PMC1158616  PMID: 6293467

Abstract

Prolyl 3-hydroxylase activity and the extent of collagen proline 3-hydroxylation were studied in six transformed and three control human cell lines. In the transformed cell lines, the enzyme activity was markedly high in two, similar to that in control cells in two and significantly low in two. The extent of proline 3-hydroxylation was markedly high in cell lines with high enzyme activity, but it was also significantly high in some transformed cell lines with enzyme activities similar to those in the controls. The results thus suggest that, in addition to the amount of enzyme activity present, the rate of collagen synthesis also affects the extent of proline 3-hydroxylation in the newly synthesized collagen. The effect of acute cell transformation on prolyl 3-hydroxylase and 4-hydroxylase activities was studied by infecting chick-embryo fibroblasts with Rous sarcoma virus mutant NY68, temperature-sensitive for transformation. At the permissive temperature prolyl 3-hydroxylase activity showed a more rapid increase and decrease than did prolyl 4-hydroxylase activity, the maximal activity for both enzymes being about 2.5 times that in the control chick fibroblasts. When the transformed cells were shifted to the non-permissive temperature the decays in the elevated enzyme activities were similar, suggesting identical half-lives.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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