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Involvement of the exomer complex in the polarized transport of Ena1 required for Saccharomyces cerevisiae survival against toxic cations

Anton, Carlos and Zanolari, Bettina and Arcones, Irene and Wang, Congwei and Mulet, Jose Miguel and Spang, Anne and Roncero, Cesar. (2017) Involvement of the exomer complex in the polarized transport of Ena1 required for Saccharomyces cerevisiae survival against toxic cations. Molecular biology of the cell, 28 (25). pp. 3672-3685.

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Abstract

Exomer is an adaptor complex required for the direct transport of a selected number of cargoes from the TGN to the plasma membrane in S. cerevisiae However, exomer mutants are highly sensitive to increased concentrations of alkali metal cations, a situation which remains unexplained by the lack of transport of any known cargoes. Here, we identify several HAL genes that act as multicopy suppressors of this sensitivity and are connected to the reduced function of the sodium ATPase Ena1. Furthermore, we find that Ena1 is dependent on exomer function. Even though Ena1 can reach the plasma membrane independently of exomer, polarized delivery of Ena1 to the bud requires functional exomer. Moreover, exomer is required for full induction of Ena1 expression after cationic stress by facilitating the plasma membrane recruitment of the molecular machinery involved in Rim101 processing and activation of the RIM101 pathway in response to stress. Both, the defective localization and the reduced levels of Ena1 contribute to the sensitivity of exomer mutants to alkali metal cations. Our work thus expands the spectrum of exomer-dependent proteins and provides a link to a more general role of exomer in TGN organization.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Growth & Development > Biochemistry (Spang)
UniBasel Contributors:Spang, Anne
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Society for Cell Biology
e-ISSN:1939-4586
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:07 Dec 2017 10:36
Deposited On:07 Dec 2017 10:36

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