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Related Experiment Videos

Yeast regulatory protein LEU3: a structure-function analysis.

K M Zhou1, Y L Bai, G B Kohlhaw

  • 1Department of Biochemistry, Purdue University, West Lafayette, IN 47907.

Nucleic Acids Research
|January 25, 1990
PubMed
Summary
This summary is machine-generated.

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Investigating LEU3 protein mutations reveals key functional regions. Specific domains control DNA binding, LEU2 activation, and co-activator response, with central deletions creating unmodulated activators that impact cell growth.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Protein Function Analysis

Background:

  • The LEU3 protein regulates genes involved in leucine biosynthesis in yeast.
  • Understanding the functional domains of transcription factors like LEU3 is crucial for deciphering gene regulation.

Purpose of the Study:

  • To delineate the functional regions of the LEU3 protein.
  • To investigate the roles of specific domains in DNA binding, transcriptional activation, and co-activator modulation.

Main Methods:

  • Site-directed mutagenesis (linker insertion, fragment deletion, oligonucleotide-directed mutagenesis) to create LEU3 mutants.
  • Functional analysis of mutant proteins to assess DNA binding, LEU2 activation, and response to alpha-isopropylmalate.
  • Growth rate analysis of yeast strains overproducing specific LEU3 mutants.

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Main Results:

  • A DNA-binding region was localized to the N-terminal 173 residues, with optimal binding requiring additional regions.
  • Transcriptional activation of LEU2 expression is dependent on the C-terminal 113 residues.
  • Deletion of central LEU3 regions resulted in an unmodulated activator, insensitive to the co-activator alpha-isopropylmalate.
  • Overproduction of this unmodulated activator inhibited cell growth.
  • Deletion of specific acidic regions had minimal impact on activation and modulation.

Conclusions:

  • The LEU3 protein possesses distinct functional domains for DNA binding, activation, and co-activator interaction.
  • The central region is critical for co-activator modulation, and its absence leads to detrimental effects on cell growth.
  • Specific acidic regions are not essential for LEU3's primary regulatory functions.