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Interaction of GAL4 and GAL80 gene regulatory proteins in vitro.

Department of Cell Biology, Stanford University School of Medicine, California 94305.

ABSTRACT

The GAL80 protein of Saccharomyces cerevisiae, synthesized in vitro, bound tightly to GAL4 protein and to a GAL4 protein-upstream activation sequence DNA complex, as shown by (i) coimmunoprecipitation of GAL4 and GAL80 proteins with anti-GAL4 antiserum, (ii) an electrophoretic mobility shift of a GAL4 protein-upstream activation sequence DNA complex upon the addition of GAL80 protein, and (iii) GAL4-dependent binding of GAL80 protein to upstream activation sequence DNA immobilized on Sepharose beads. Anti-GAL4 antisera were raised against a GAL4-URA3 fusion protein, which could be purified to homogeneity in a single step with the use of an affinity chromatographic procedure for the URA3 gene product.

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