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Active alpha-glucoside transport in Saccharomyces cerevisiae
B U Stambuk1, M A da Silva, A D Panek
1Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil.
FEMS Microbiology Letters
|January 27, 1999
Summary
The AGT1 permease transports alpha-glucosides like maltose and trehalose. Alpha-methylglucoside best induces its activity, but trehalose is the most preferred transported sugar.
Area of Science:
- Biochemistry
- Molecular Biology
- Yeast Genetics
Background:
- The AGT1 permease facilitates the transport of alpha-glucosides in yeast.
- Understanding permease function is crucial for nutrient uptake and cellular metabolism.
Purpose of the Study:
- To characterize the substrate specificity and induction of the AGT1 permease.
- To determine the preferred substrates and optimal inducers for AGT1-mediated transport.
Main Methods:
- Transport assays were performed using various alpha-glucoside substrates.
- Initial transport rates were measured to assess substrate preference.
- Induction effects of different sugars on AGT1 activity were evaluated in wild-type and mutant yeast strains.
Main Results:
- AGT1 transports maltose, trehalose, maltotriose, alpha-methylglucoside, melezitose, and sucrose.
- Alpha-methylglucoside was identified as the most effective inducer of AGT1 transport activity.
- Trehalose showed no inducing effect on AGT1 activity.
- Initial transport rate analysis indicated trehalose as the preferred substrate, followed by sucrose.
Conclusions:
- The AGT1 permease exhibits specific substrate preferences and induction patterns.
- Alpha-methylglucoside is a potent inducer, while trehalose is a preferred substrate for AGT1.
- These findings contribute to understanding nutrient transport mechanisms in yeast.