Linked Life Data

4724584

Source:http://linkedlifedata.com/resource/pubmed/id/4724584

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pubmed-article:4724584pubmed:abstractTextCholesterol biosynthesis was studied in rat liver subcellular fractions incubated with dl-[2-(14)C]mevalonic acid under gas phases consisting of either N(2)+O(2) (90:10) or CO+O(2) (90:10). CO inhibits cholesterol biosynthesis from [2-(14)C]mevalonic acid and results in a large accumulation of radioactive 4,4-dimethyl sterols. Separation of the components of the 4,4-dimethyl sterol fraction showed that lanosterol and dihydrolanosterol are the major components that accumulate during cholesterol biosynthesis in an atmosphere containing CO, whereas 14-demethyl-lanosterol and 14-demethyldihydrolanosterol are the major components of the much less intensely radioactive 4,4-dimethyl sterol fraction isolated from incubations with N(2)+O(2) as the gas phase. The identities of lanosterol, dihydrolanosterol and 14-demethyldihydrolanosterol were confirmed by both radiochemical and physicochemical methods, including g.l.c. and combined g.l.c.-mass spectrometry. CO therefore results in a qualitative as well as a quantitative difference in the 4,4-dimethyl sterol fraction which arises during cholesterol biosynthesis from mevalonic acid. The specific radioactivity of the [(14)C]lanosterol biosynthesized in the presence of CO was lower than that of its companion, [(14)C]dihydrolanosterol. The relative amounts of 4,4-dimethyl-Delta(24)-sterols and 4,4-dimethyl-24,25-dihydrosterols present in each type of incubation suggest that enzymic reduction of the sterol side chain occurs predominantly at a stage after that of lanosterol.lld:pubmed
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pubmed-article:4724584pubmed:articleTitleThe effect of carbon monoxide on the nature of the accumulated 4,4-dimethyl sterol precursors of cholesterol during its biosynthesis from (2-14C)mevalonic acid in vitro.lld:pubmed
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