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Prospore membrane formation linked to the leading edge protein (LEP) coat assembly

A C Moreno-Borchart1, K Strasser, M G Finkbeiner

  • 1Abteilung Molekulare Zellbiologie, Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Martinsried, Germany.

The EMBO Journal
|December 18, 2001
PubMed

Insights

Researchers identified Ady3p and Ssp1p proteins crucial for forming the leading edge protein (LEP) coat during yeast prospore membrane (PSM) development. This LEP coat guides the cellularization process, ensuring proper encapsulation of daughter nuclei after meiosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Yeast Genetics

Background:

  • Meiosis in yeast produces four daughter cells within a mother cell boundary.
  • Meiosis-specific plaques (MPs) on spindle pole bodies (SPBs) initiate prospore membrane (PSM) formation.
  • PSMs encapsulate post-meiotic nuclei during yeast differentiation.

Purpose of the Study:

  • Identify functional components of the leading edge protein (LEP) coat.
  • Elucidate the role of Ady3p and Ssp1p in PSM formation.
  • Understand the assembly and function of the LEP coat in yeast cellularization.

Main Methods:

  • Protein identification and characterization.
  • Yeast genetics and mutant analysis.
  • Microscopy to visualize PSM and LEP coat assembly.

Main Results:

  • Ady3p and Ssp1p are identified as functional components of the LEP coat.
  • Ssp1p is essential for LEP coat assembly, which includes Ady3p and Don1p.
  • LEP coat assembly involves cytosolic precursors binding to SPBs in an Ady3p-dependent manner.
  • Functional LEP coats require Ssp1p and MP components for SPB-mediated processes.
  • The LEP coat is vital for shaping the cup-like membrane during PSM growth and cellularization.

Conclusions:

  • Ady3p and Ssp1p are key players in the formation of the leading edge protein coat.
  • The LEP coat is essential for the regulated cellularization of cytoplasm around yeast post-meiotic nuclei.
  • This study reveals novel insights into the molecular mechanisms governing meiotic cytokinesis in yeast.

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