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Binding of coatomer by the PEX11 C-terminus is not required for function
A G Maier1, S Schulreich, M Bremser
1Zentrum für Molekulare Biologie (ZMBH), University of Heidelberg, Heidelberg, Germany.
FEBS Letters
|November 9, 2000
Summary
Coatomer binding to PEX11 proteins is not essential for microbody division in eukaryotes. This study clarifies the conserved mechanisms of microbody biogenesis and protein import, revealing coatomer
Area of Science:
- Cell Biology
- Molecular Biology
- Organelle Biogenesis
Background:
- Microbodies are vital single membrane-bound organelles in eukaryotes, performing diverse metabolic functions.
- Conserved mechanisms govern microbody membrane biogenesis and matrix protein import across evolution.
- PEX11 proteins are crucial for microbody division, with coatomer involvement previously suggested.
Purpose of the Study:
- To investigate the role of coatomer binding to PEX11 proteins in microbody division.
- To determine if coatomer interaction with PEX11 C-termini is necessary for PEX11 function.
Main Methods:
- Comparative analysis of coatomer binding to PEX11 peptides from different species (trypanosomes, yeast, mammals).
- Site-directed mutagenesis of the PEX11 C-terminus to disrupt coatomer binding.
- Functional assessment of mutated PEX11 in yeast and trypanosome models.
Main Results:
- Coatomer binding specificity was observed for specific PEX11 C-termini (trypanosome, rat Pex11alpha) but not others (yeast Pex11p, human Pex11beta).
- Identical binding of trypanosome, yeast, and bovine coatomers to selected peptides was demonstrated.
- Mutations disrupting coatomer binding at the PEX11 C-terminus did not impair PEX11 function in yeast or trypanosomes.
Conclusions:
- Coatomer binding to the C-terminus of PEX11 is not a prerequisite for PEX11-mediated microbody division.
- The study refines understanding of the molecular mechanisms underlying microbody biogenesis and division.