Insulin-like signaling in yeast: modulation of protein phosphatase 2A, protein kinase A, cAMP-specific phosphodiesterase, and glycosyl-phosphatidylinositol-specific phospholipase C activities.

Abstract:

:Previously, we have described significant effects of human insulin on glucose metabolism in the yeast Saccharomyces cerevisiae under conditions of growth limitation. These regulations apparently rely on a transmembrane receptor capable of binding human insulin and responding by tyrosine/serine phosphorylation of a specific set of polypeptides [Müller, G., Rouveyre, N., Crecelius, A., and Bandlow, W. (1998) Biochemistry 37, 8683-8695; Müller, G., Rouveyre, N., Upshon, C., Gross, E., and Bandlow, W. (1998) Biochemistry 37, 8696-8704; Müller, G., Rouveyre, N., Upshon, C., and Bandlow, W. (1998) Biochemistry 37, 8705-8713]. To characterize the molecular link between the initial steps in insulin-like signaling in yeast and the changes in the activities of glycogen synthase and glycogen phosphorylase, we examined here the effects of human insulin on a set of key regulatory enzymes of glycogen metabolism, protein phosphatase 2A (PP2A), cAMP-specific phosphodiesterase (cAMP-PDE), and protein kinase A (PKA). PP2A was activated about 2-fold by insulin in spheroplasts and in intact cells, whereas the fraction of active PKA was significantly reduced in a cAMP-independent manner as well as through a subsequent up to 3-fold increase in particulate cAMP-PDE activity accompanied by a 50% decrease in cytosolic cAMP levels. In addition, glycosyl-phosphatidylinositol-specific phospholipase C (GPI-PLC), which in isolated rat adipocytes is activated by insulin, was stimulated to up to 5-fold by glucose and 10-fold by glucose plus insulin in both yeast spheroplasts and intact cells leading to a concentration-dependent leftward shift of the glucose-response curve for activation of the GPI-PLC. GPI-PLC was most pronouncedly stimulated by authentic human insulin compared to various insulin analogues and insulin-like growth factor I. In addition to lipolytic cleavage by GPI-PLC, the GPI anchor of the cAMP-binding ectoprotein, Gce1p, was secondarily processed by a rapid proteolytic event. As the GPI-PLC reaction is rate limiting, the efficiency of the two-step anchor cleavage was significantly increased when insulin was present together with glucose as compared to glucose alone. The insulin concentrations effective in modulating PP2A, PKA, cAMP-PDE, and GPI-PLC activities correlate well with those required for half-saturation of the specific binding sites as well as for stimulation of protein phosphorylation and glycogen accumulation. The data suggest that mammalian insulin-sensitive cells and yeast share (part of) the key regulatory mechanism (consisting of PP2A, PKA, cAMP-PDE, and GPI-PLC) involved in the transduction of the insulin signal from the respective receptor systems to glycogen synthase and phosphorylase.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Müller G,Grey S,Jung C,Bandlow W

doi

10.1021/bi9920432

subject

Has Abstract

pub_date

2000-02-15 00:00:00

pages

1475-88

issue

6

eissn

0006-2960

issn

1520-4995

pii

bi9920432

journal_volume

39

pub_type

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