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The ARF exchange factors Gea1p and Gea2p regulate Golgi structure and function in yeast
A Peyroche1, R Courbeyrette, A Rambourg
1Service de Biochimie et Génétique Moléculaire, Bat. 142, Département de Biologie Cellulaire et Moléculaire, CEA/Saclay, 91191 Gif-sur-Yvette, France.
Journal of Cell Science
|August 9, 2001
Summary
The guanine nucleotide exchange factors Gea1p and Gea2p are essential for yeast viability and proper Golgi structure. These proteins regulate membrane dynamics, impacting ER-Golgi and intra-Golgi transport.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Guanine nucleotide exchange factors (GEFs) with Sec7 domains regulate ADP-ribosylation factor (ARF) GTPase activity.
- These GEFs are crucial for membrane dynamics and intracellular trafficking.
- The specific roles of Sec7 domain GEFs in cellular transport pathways remain unclear.
Purpose of the Study:
- To functionally analyze Gea1p and Gea2p, two Sec7 domain GEFs in Saccharomyces cerevisiae.
- To elucidate the roles of Gea1p and Gea2p in membrane trafficking and Golgi apparatus function.
Main Methods:
- Generation and analysis of temperature-sensitive gea mutants in yeast.
- Assessment of ER-Golgi and intra-Golgi transport.
- Evaluation of protein secretion and Golgi structure.
Main Results:
- Gea1p and Gea2p are essential for yeast viability, with functional redundancy.
- gea mutants exhibit defects in ER-Golgi and intra-Golgi transport.
- Mutants display cargo-selective secretion defects and perturbed Golgi structure, similar to COPI and arf mutants.
Conclusions:
- Gea1p and Gea2p are critical for maintaining Golgi apparatus structure and function in yeast.
- These GEFs play a significant role in regulating membrane dynamics and protein transport within the cell.