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Closed Access item Rga2 IS a Rho2 GAP that regulates morphogenesis and cell integrity in Schizosaccharomyces pombe

Authors:Villar-Tajadura, María Antonia
Coll, Pedro M.
Santos Romero, Beatriz
Pérez González, Pilar
Keywords:GTPase, Rho, GAP, Morphogenesis, Cell integrity
Issue Date:10-Oct-2008
Publisher:Blackwell Publishing
Citation:Molecular Microbiology 70(4): 867–881 (2008)
Abstract:Schizosaccharomyces pombe Rho2 GTPase regulates alpha-D-glucan synthesis and acts upstream of Pck2 to activate the MAP kinase pathway for cell integrity. However, little is known about its regulation. Here we describe Rga2 as a Rho2 GTPase-activating protein (GAP) that regulates cell morphology. rga2+ gene is not essential for growth but its deletion causes longer and thinner cells whereas rga2+ overexpression causes shorter and broader cells. rga2+ overexpression also causes abnormal accumulation of Calcofluor-stained material and cell lysis, suggesting that it also participates in cell wall integrity. Rga2 localizes to growth tips and septum region. The N-terminal region of the protein is required for its correct localization whereas the PH domain is necessary exclusively for Rga2 localization to the division area. Also, Rga2 localization depends on polarity markers and on actin polymerization. Rga2 interacts with Rho2 and possesses in vitro and in vivo GAP activity for this GTPase. Accordingly, rga2Delta cells contain more alpha-D-glucan and therefore partially suppress the thermosensitivity of mok1-664 cells, which have a defective alpha-D-glucan synthase. Additionally, genetic interactions and biochemical analysis suggest that Rga2 regulates Rho2-Pck2 interaction and might participate in the regulation of the MAPK cell integrity pathway.
Description:15 pages, 8 figures.-- PMID: 18793338 [PubMed].-- Supporting information (Table S1: List of strains used in the study) available at: http://www3.interscience.wiley.com/journal/121408738/suppinfo
Publisher version (URL):http://dx.doi.org/10.1111/j.1365-2958.2008.06447.x
URI:http://hdl.handle.net/10261/11171
ISSN:0950-382X (Print)
1365-2958 (Online)
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Appears in Collections:(IMB) Artículos

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