Role of 14-3-3 proteins in the regulation of neutral trehalase in the yeast Saccharomyces cerevisiae.

In higher eukaryotes, 14-3-3 proteins participate in numerous cellular processes, and carry out their function through a variety of different molecular mechanisms, including regulation of protein localization and enzyme activation. Here, it is shown that the two yeast 14-3-3 homologues, Bmh1p and Bmh2p, form a complex with neutral trehalase (Nth1p), ...
an enzyme that is responsible for trehalose degradation and is required in a variety of stress conditions. In a purified in vitro system, either one of the two 14-3-3 yeast isoforms are necessary for complete activation of neutral trehalase (Nth1p) after phosphorylation by PKA. It is further demonstrated that Bmh1p and Bmh2p bind to the amino-terminal region of phosphorylated trehalase, thereby modulating its enzymatic activity. This work represents the first demonstration of enzyme activation mediated by 14-3-3 binding in yeast.
Mesh Terms:
14-3-3 Proteins, DNA-Binding Proteins, Enzyme Activation, Gene Expression Regulation, Fungal, Genes, Fungal, Saccharomyces cerevisiae, Trehalase, Trehalose
FEMS Yeast Res.
Date: Feb. 01, 2008
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