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Receptor-induced polymerization of coatomer
C Reinhard1, C Harter, M Bremser
1Biochemie-Zentrum Heidelberg (BZH), Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany.
Summary
Coatomer complex polymerization drives COPI vesicle budding from the Golgi. This process involves coatomer conformational changes induced by interactions with p23, a key transmembrane protein.
Area of Science:
- Cell Biology
- Molecular Biology
- Protein Dynamics
Background:
- Coatomer complex is essential for COPI vesicle formation.
- The precise mechanism of COPI vesicle budding remains unclear.
- p23 is a transmembrane protein found on COPI vesicles.
Purpose of the Study:
- To investigate the interaction between coatomer and the cytoplasmic domain of p23.
- To elucidate the role of this interaction in COPI vesicle biogenesis.
Main Methods:
- In vitro polymerization assays.
- Analysis of coatomer conformation.
- In vivo studies on isolated COPI vesicles.
Main Results:
- Coatomer interaction with p23 peptide domain induces conformational changes.
- This interaction leads to coatomer polymerization in vitro.
- The conformational change and polymerization are also observed in vivo on COPI vesicles.
- Approximately four p23 peptides associate with one coatomer complex upon polymerization.
Conclusions:
- A mechanism is proposed where p23 binding induces coatomer conformational change and polymerization.
- This polymerization drives COPI vesicle bud formation on the Golgi membrane.
- The findings provide new insights into the molecular mechanisms of intracellular transport.