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. 1991 Oct 2;115(2):289–295. doi: 10.1083/jcb.115.2.289

Maturation of the yeast plasma membrane [H+]ATPase involves phosphorylation during intracellular transport

PMCID: PMC2289159  PMID: 1833410

Abstract

In this study we show that the plasma membrane [H+]ATPase of Saccharomyces cerevisiae is phosphorylated on multiple Ser and Thr residues in vivo. Phosphorylation occurs during the movement of newly synthesized ATPase from the ER to the cell surface, as revealed by the analysis of temperature-sensitive sec mutants blocked at successive steps of the secretory pathway. Two-dimensional phosphopeptide analysis of the ATPase indicates that, although most sites are phosphorylated at or before arrival in secretory vesicles, some phosphopeptides are unique to the plasma membrane. Phosphorylation of plasma membrane- specific site(s) is associated with increased ATPase activity during growth on glucose. Upon glucose starvation, dephosphorylation occurs concomitantly with a decrease in enzymatic activity, and both are rapidly reversed (within 2 min) upon readdition of glucose. We suggest that reversible, site-specific phosphorylation serves to adjust ATPase activity in response to nutritional signals.

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Selected References

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