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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Definition of the p53 binding-site on the tms1 protein

P Wagner, A Fuchs, W Nastainczyk

    International Journal of Oncology
    |May 10, 2011
    PubMed

    Insights

    Researchers identified the yeast TMS1 gene, crucial for interacting with tumor protein p53. This interaction involves specific binding sites on both proteins, offering insights into cell division regulation.

    Area of Science:

    • Molecular Biology
    • Yeast Genetics
    • Tumor Biology

    Background:

    • The tumor suppressor protein p53 plays a critical role in cell cycle regulation and apoptosis.
    • Expression of a tumor-derived p53 mutant can induce lethal growth arrest in fission yeast.
    • The yeast TMS1 gene was previously identified through complementation of this p53-induced growth defect.

    Purpose of the Study:

    • To characterize the interaction between the yeast TMS1 gene product and tumor protein p53.
    • To map the specific binding regions involved in the p53-TMS1 interaction.
    • To identify the functional significance of the TMS1 protein in relation to p53.

    Main Methods:

    • Gene cloning and complementation assays in fission yeast.
    • Co-immunoprecipitation assays using yeast extracts and purified recombinant proteins to detect complex formation.
    • In vitro protein binding studies to map interaction domains.
    • Site-directed mutagenesis to define the p53 binding site on TMS1.

    Main Results:

    • The TMS1 gene product forms stable complexes with tumor protein p53 in both yeast cells and in vitro.
    • The interaction between p53 and TMS1 was mapped to the C-terminal region of p53.
    • The specific p53 binding site on the TMS1 protein was identified as the amino acid sequence YMITTED FCT (aa 116-125).
    • This binding site is located near a conserved cell division motif within TMS1.

    Conclusions:

    • The yeast TMS1 protein directly binds to the C-terminal region of tumor protein p53.
    • A specific sequence within TMS1 (YMITTED FCT) is essential for p53 binding.
    • This interaction may be functionally relevant to cell division processes regulated by p53.

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