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. 1970 Jul;103(1):27–31. doi: 10.1128/jb.103.1.27-31.1970

Cholesterol Inhibition of Isopentenyl Pyrophosphate Δ3,Δ2-Isomerase in Mycoplasma laidlawii

Paul F Smith 1, Marie R Smith 1
PMCID: PMC248034  PMID: 4316364

Abstract

Cholesterol inhibits isopentenyl Δ3,Δ2-isomerase of Mycoplasma laidlawii in an apparently competitive fashion. The conversion of mevalonic acid to isopentenyl pyrophosphate is slightly stimulated. Organisms grown in the presence of mevalonic-2-14C acid contain small amounts of radio-label in nucleic acid and protein fractions. Most of the label is found in the lipids and is reduced dramatically in organisms grown with cholesterol. No significant accumulation of phosphorylated intermediates of polyterpene biosynthesis was observed in cells or culture supernatant fluid. All of the radioactivity appearing in the nucleic acid fraction occurs in the minor nucleoside, isopentenyl adenosine, of the transfer ribonucleic acid. The necessity for synthesis by the organisms of this minor nucleoside from mevalonic acid may explain the site of enzyme inhibition by cholesterol of polyterpene biosynthesis.

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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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