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. 1982 Jul;151(1):334–342. doi: 10.1128/jb.151.1.334-342.1982

Effect of inositol starvation on the in vitro syntheses of mannan and N-acetylglucosaminylpyrophosphoryldolichol in Saccharomyces cerevisiae.

B A Hanson, R L Lester
PMCID: PMC220245  PMID: 6177681

Abstract

An early consequence of starvation for inositol in yeast is inhibition of synthesis of the major cell wall components mannan and glucan. In looking for the mechanism of this inhibition, we found that the activity of the enzyme catalyzing the synthesis of N-acetylglucosaminylpyrophosphoryldolichol was diminished in particular membrane preparations from cells starved for inositol. This loss of reactivity was observed under a variety of in vitro assay conditions and could be restored by the addition of phosphatidylinositol but not by other phosphoinositol-containing sphingolipids known to occur in yeast. When assayed in the presence of high concentrations of Triton X-100, enzyme preparations from both control and inositol-starved cells required phosphatidylinositol for maximal activity. Since this enzyme catalyzed an early step in the synthesis of mannan that is N-linked to protein, a reasonable hypothesis is that inhibition of mannan synthesis in inositol-starved cells results from the depletion of the necessary cofactor phosphatidylinositol.

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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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