RRC ID 5646
Author Abe M, Setoguchi Y, Tanaka T, Awano W, Takahashi K, Ueda R, Nakamura A, Goto S.
Title Membrane protein location-dependent regulation by PI3K (III) and rabenosyn-5 in Drosophila wing cells.
Journal PLoS ONE
Abstract The class III phosphatidylinositol-3 kinase (PI3K (III)) regulates intracellular vesicular transport at multiple steps through the production of phosphatidylinositol-3-phosphate (PI(3)P). While the localization of proteins at distinct membrane domains are likely regulated in different ways, the roles of PI3K (III) and its effectors have not been extensively investigated in a polarized cell during tissue development. In this study, we examined in vivo functions of PI3K (III) and its effector candidate Rabenosyn-5 (Rbsn-5) in Drosophila wing primordial cells, which are polarized along the apical-basal axis. Knockdown of the PI3K (III) subunit Vps15 resulted in an accumulation of the apical junctional proteins DE-cadherin and Flamingo and also the basal membrane protein beta-integrin in intracellular vesicles. By contrast, knockdown of PI3K (III) increased lateral membrane-localized Fasciclin III (Fas III). Importantly, loss-of-function mutation of Rbsn-5 recapitulated the aberrant localization phenotypes of beta-integrin and Fas III, but not those of DE-cadherin and Flamingo. These results suggest that PI3K (III) differentially regulates localization of proteins at distinct membrane domains and that Rbsn-5 mediates only a part of the PI3K (III)-dependent processes.
Volume 4(10)
Pages e7306
Published 2009-10-2
DOI 10.1371/journal.pone.0007306
PMID 19798413
PMC PMC2749332
MeSH Animals Animals, Genetically Modified Cadherins / metabolism Cell Membrane / metabolism* Drosophila Drosophila Proteins / metabolism* Drosophila melanogaster / metabolism Endocytosis Gene Expression Regulation, Developmental* Lysosomes / metabolism Mutation Phenotype Phosphatidylinositol 3-Kinases / metabolism* Protein Structure, Tertiary Vesicular Transport Proteins / metabolism* Wings, Animal / metabolism*
IF 2.766
Times Cited 8