Abstract

Glucose repression occurs in many yeast species and some filamentous fungi, and it represses the expression and secretion of many intracellular and extracellular proteins. In recent years, it has been found that many biochemical reactions in yeast cells are mediated by phosphatidylinositol (PI)-type signaling pathway. However, little is known about the relationships between PI-type signaling and glucose repression, gene expression and invertase secretion in yeasts. Many evidences in our previous studies showed that glucose repression, invertase secretion, gene expression and cell growth were mediated by inositol and PI in Saccharomyces and Schizosaccharomyces. The elucidation of the new regulatory mechanisms of protein secretion, gene expression and glucose repression would be an entirely new aspect of inositol and PI-type signaling regulation in yeasts.

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