GAL4 Protein: Purification, Association with GAL80 Protein, and Conserved Domain Structure

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 1990 Jun 1

PMID 2188103

Citations 34

Authors

D I Chasman

R D Kornberg

Affiliations

Soon will be listed here.

Abstract

Expression of the yeast Saccharomyces cerevisiae GAL4 protein under its own (galactose-inducible) control gave 5 to 10 times the level of protein observed when the GAL4 gene was on a high-copy plasmid. Purification of GAL4 by a procedure including affinity chromatography on a GAL4-binding DNA column yielded not only GAL4 but also a second protein, shown to be GAL80 by its reaction with an antipeptide antibody. Sequence comparisons of GAL4 and other members of a family of proteins sharing homologous cysteine finger motifs identified an additional region of homology in the middle of these proteins shown by genetic analysis to be important for GAL4 function. GAL4 could be cleaved proteolytically at the boundary of the conserved region, defining internal and carboxy-terminal folded domains.

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