RRC ID 32634
Author Tsukamoto Y, Kagiwada S, Shimazu S, Takegawa K, Noguchi T, Miyamoto M.
Title Coordinated regulation by two VPS9 domain-containing guanine nucleotide exchange factors in small GTPase Rab5 signaling pathways in fission yeast.
Journal Biochem Biophys Res Commun
Abstract The small GTPase Rab5 is reported to regulate various cellular functions, such as vesicular transport and endocytosis. VPS9 domain-containing proteins are thought to activate Rab5(s) by their guanine-nucleotide exchange activities. Numerous VPS9 proteins have been identified and are structurally conserved from yeast to mammalian cells. However, the functional relationships among VPS9 proteins in cells remain unclear. Only one Rab5 and two VPS9 proteins were identified in the Schizosaccharomyces pombe genome. Here, we examined the cellular function of two VPS9 proteins and the relationship between these proteins in cellular functions. Vps901-GFP and Vps902-GFP exhibited dotted signals in vegetative and differentiated cells. vps901 deletion mutant (Δvps901) cells exhibited a phenotype deficient in the mating process and responses to high concentrations of ions, such as calcium and metals, and Δvps901Δvps902 double mutant cells exhibited round cell shapes similar to ypt5-909 (Rab5 mutant allele) cells. Deletion of both vps901 and vps902 genes completely abolished the mating process and responses to various stresses. A lack of vacuole formation and aberrant inner cell membrane structures were also observed in Δvps901Δvps902 cells by electron microscopy. These data strongly suggest that Vps901 and Vps902 are cooperatively involved in the regulation of cellular functions, such as cell morphology, sexual development, response to ion stresses, and vacuole formation, via Rab5 signaling pathways in fission yeast cells.
Volume 458(4)
Pages 802-9
Published 2015-3-20
DOI 10.1016/j.bbrc.2015.02.031
PII S0006-291X(15)00249-1
PMID 25686494
MeSH Carboxypeptidases / metabolism Gene Deletion Guanine Nucleotide Exchange Factors Mutation Protein Transport Schizosaccharomyces / cytology* Schizosaccharomyces / genetics Schizosaccharomyces / growth & development Schizosaccharomyces / metabolism* Schizosaccharomyces pombe Proteins / genetics Schizosaccharomyces pombe Proteins / metabolism* Signal Transduction* rab5 GTP-Binding Proteins / metabolism*
IF 2.985
Times Cited 1
Yeast FY7520 FY7251 FY7132 FY6767 FY7643 FY6873 FY7085