title: Yeast regulatory protein LEU3: a structure-function analysis.
abstract: Eleven mutations resulting in partially deleted or truncated LEU3 protein were generated by linker insertion or other modifications at restriction sites, deletion of restriction fragments, or oligonucleotide-directed mutagenesis. Functional studies of these mutants showed the following: (i) A specific DNA binding region is contained within the 173 N-terminal residues, but other regions of the protein are required for optimal binding. (ii) Activation of LEU2 expression depends on the C-terminal 113 residues of the LEU3 protein. (iii) Deletion of part or all of a central section of LEU3 eliminates the ability of the LEU3 protein to respond to the co-activator alpha-isopropylmalate, i.e. creates an unmodulated activator. (iv) Overproduction of unmodulated activator slows down cell growth. (v) Specific deletion of two short acidic regions, including one with net charge - 19, has only minor effects on activation and modulation.
authors.affiliation: Department of Biochemistry, Purdue University, West Lafayette, IN 47907.
authors.forename: K M
authors.initials: KM
authors.lastname: Zhou
authors.forename: Y L
authors.initials: YL
authors.lastname: Bai
authors.forename: G B
authors.initials: GB
authors.lastname: Kohlhaw
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002872:Chromosome Deletion; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D009154:Mutation; D015345:Oligonucleotide Probes; D010957:Plasmids; D011401:Promoter Regions, Genetic; D011487:Protein Conformation; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins; D013329:Structure-Activity Relationship; D015534:Trans-Activators
chemical_list: D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C063667:LEU3 protein, S cerevisiae; D015345:Oligonucleotide Probes; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators