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Related Experiment Videos

Deletion mapping a eukaryotic promoter

K Struhl

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Investigating yeast his3 gene promoter function, this study found specific upstream DNA sequences are crucial for normal gene expression. The T-A-T-A box alone is insufficient, suggesting a complex promoter region.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Yeast Biology

    Background:

    • The Saccharomyces cerevisiae his3 gene is essential for histidine biosynthesis.
    • Promoter regions regulate gene transcription initiation.
    • Understanding promoter function is key to gene regulation studies.

    Purpose of the Study:

    • To delineate the essential DNA sequences within the yeast his3 promoter.
    • To determine the role of upstream elements and the T-A-T-A box in his3 gene expression.
    • To compare the complexity of yeast and prokaryotic promoters.

    Main Methods:

    • Systematic deletion mutagenesis of the 5' flanking region of the his3 gene.
    • Phenotypic analysis of resulting mutants to assess his3 gene expression levels.

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  • Comparison of mutant phenotypes with wild-type and null alleles.

    • Main Results:

    • Deletions retaining >155 bp upstream of coding sequences showed wild-type his3 phenotype.
    • Deletions between 113-65 bp upstream resulted in reduced his3 expression.
    • Mutations <45 bp upstream were similar to his3 null alleles.
    • A specific upstream sequence (113-155 bp) is necessary for wild-type expression.
    • The T-A-T-A box alone is insufficient for wild-type promoter function.

    Conclusions:

    • The yeast his3 promoter requires specific upstream DNA elements beyond the T-A-T-A box for optimal function.
    • The his3 promoter is larger and potentially more complex than typical prokaryotic promoters.
    • These findings contribute to understanding eukaryotic gene regulation mechanisms.