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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...

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A yeast two hybrid screen identifies SPATA4 as a TRAPP interactor.

Débora Teixeira Duarte1, Sokunthear Hul, Michael Sacher

  • 1Concordia University, Department of Biology, Montreal, Quebec, Canada.

FEBS Letters
|August 11, 2011
PubMed
Summary

Researchers identified SPATA4, a protein found in spermatocytes, as a binding partner for the TRAPP complex

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Interactions

Background:

  • The TRAPP (Transport Protein Particle) complex is crucial for vesicle tethering and protein transport.
  • SPATA4 is a spermatocyte-specific protein with an uncharacterized function.
  • The DUF1042 domain is present in only three human proteins, including SPATA4.

Purpose of the Study:

  • To identify novel interacting partners of the TRAPP complex.
  • To investigate the function and localization of SPATA4.
  • To explore the role of SPATA4 within the context of the TRAPP complex and spermatogenesis.

Main Methods:

  • Yeast two-hybrid screening using the TRAPP C2 subunit as bait.
  • Co-immunoprecipitation and fractionation studies to confirm protein interactions and localization.

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  • Comparative analysis of DUF1042 domain-containing proteins.

    • Main Results:

    • SPATA4 was identified as a novel interacting partner of the TRAPP complex, specifically binding to the C2 subunit.
    • SPATA4 was found to localize to both cytosolic and nuclear fractions, suggesting diverse functions.
    • SPATA4's interaction with TRAPP C2 was specific, as another DUF1042 protein did not interact.

    Conclusions:

    • SPATA4 plays a role in membrane traffic, potentially through its interaction with the TRAPP complex.
    • The TRAPP complex may have specialized functions within spermatocytes.
    • SPATA4's interaction with TRAPP highlights a novel aspect of protein transport regulation in male germ cells.