| Differences between proline and lysine hydroxylations in their inhibition by zinc or by ascorbate deficiency during collagen synthesis in various cell types. | |
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MedLine Citation:
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PMID: 6263355 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The addition of Zn2+ inhibited lysine hydroxylation markedly less effectively than it did proline hydroxylation in chick embryo tendon cells, 3T6 fibroblasts and lysyl hydroxylase-deficient Ehlers-Danlos Syndrome Type VI fibroblasts. With low Zn2+ concentrations, a similar difference was also seen in chick embryo cartilage cells, whereas with high concentrations both hydroxylations were affected to the same extent in this cell type. Ascorbate deficiency likewise had a much less effect on lysine than proline hydroxylation when studied with 3T6 fibroblasts. As these two effectors involve quite different mechanisms, it is suggested that relative insensitivity to inhibition may be a property of lysine hydroxylation seen in many cell types with a number of agents. Studies on the mechanism of the difference in the inhibition indicates that the phenomenon is probably not due to differences in the kinetic constants of Zn2+ and ascorbate for the two enzymes. Neither is it probably to any major extent due to delayed procollagen triple helix formation nor a difference in the location of the two hydroxylases within the cisternae of the rough endoplasmic reticulum. The difference similarly cannot be explained solely by an excess of lysyl hydroxylase in the cell. It may thus be due either to some other intracellular property or to the combined effect of several factors. |
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Authors:
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H Anttinen; U Puistola; T Pihlajaniemi; K I Kivirikko |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biochimica et biophysica acta Volume: 674 ISSN: 0006-3002 ISO Abbreviation: Biochim. Biophys. Acta Publication Date: 1981 May |
Date Detail:
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Created Date: 1981-08-27 Completed Date: 1981-08-27 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0217513 Medline TA: Biochim Biophys Acta Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 336-44 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Ascorbic Acid / pharmacology* Ascorbic Acid Deficiency / enzymology Cartilage / enzymology Cells, Cultured Chick Embryo Chickens Collagen / biosynthesis* Ehlers-Danlos Syndrome / enzymology Fibroblasts / enzymology Kinetics Mice Mixed Function Oxygenases / metabolism* Procollagen-Lysine, 2-Oxoglutarate 5-Dioxygenase / metabolism* Procollagen-Proline Dioxygenase / metabolism* Skin / enzymology Tendons / enzymology Zinc / pharmacology* |
| Chemical | |
Reg. No./Substance:
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50-81-7/Ascorbic Acid; 7440-66-6/Zinc; 9007-34-5/Collagen; EC 1.-/Mixed Function Oxygenases; EC 1.14.11.2/Procollagen-Proline Dioxygenase; EC 1.14.11.4/Procollagen-Lysine, 2-Oxoglutarate 5-Dioxygenase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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