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Journal of Cell Science 114, 2241-2253 (2001)
© 2001 The Company of Biologists Limited

RESEARCH ARTICLE

The ARF exchange factors Gea1p and Gea2p regulate Golgi structure and function in yeast

Anne Peyroche1, Régis Courbeyrette1, Alain Rambourg1 and Catherine L. Jackson2,*

1 Service de Biochimie et Génétique Moléculaire, Bat. 142, Département de Biologie Cellulaire et Moléculaire, CEA/Saclay, 91191 Gif-sur-Yvette, France
2 Cell Biology and Metabolism Branch, NICHD, NIH, Bldg. 18T, Room 101, 18 Library Drive, Bethesda, MD 20892-5430, USA

*Author for correspondence (e-mail: cathyj{at}helix.nih.gov)

Accepted March 3, 2001

The Sec7 domain guanine nucleotide exchange factors (GEFs) for the GTPase ARF are highly conserved regulators of membrane dynamics. Their precise molecular roles in different trafficking steps within the cell have not been elucidated. We present a functional analysis of two members of this family, Gea1p and Gea2p, in the yeast Saccharomyces cerevisiae. Gea1p and Gea2p can functionally replace each other, but at least one is necessary for viability. Temperature sensitive gea mutants were generated and found to have defects in ER-Golgi and intra-Golgi transport. Similar to mutants in COPI subunits in yeast, gea mutants had a cargo-selective secretion defect, in that some proteins continued to be secreted whereas others were blocked in the ER or early Golgi. Like yeast arf mutants, the rate of transport of those proteins that continued to be secreted was slowed. In addition, the structure of Golgi elements was severly perturbed in gea mutants. We conclude that Gea1p and Gea2p play an important role in the structure and functioning of the Golgi apparatus in yeast.

Key words: ADP-ribosylation factor (ARF), Guanine nucleotide exchange factor (GEF), Sec7 domain, GTP-binding protein, Brefeldin A (BFA), Trafficking, Secretory Pathway, Golgi Apparatus, Yeast


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[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 2001