RRC ID 21993
Author Satoh T, Inagaki T, Liu Z, Watanabe R, Satoh AK.
Title GPI biosynthesis is essential for rhodopsin sorting at the trans-Golgi network in Drosophila photoreceptors.
Journal Development
Abstract Sorting of integral membrane proteins plays crucial roles in establishing and maintaining the polarized structures of epithelial cells and neurons. However, little is known about the sorting mechanisms of newly synthesized membrane proteins at the trans-Golgi network (TGN). To identify which genes are essential for these sorting mechanisms, we screened mutants in which the transport of Rhodopsin 1 (Rh1), an apical integral membrane protein in Drosophila photoreceptors, was affected. We found that deficiencies in glycosylphosphatidylinositol (GPI) synthesis and attachment processes cause loss of the apical transport of Rh1 from the TGN and mis-sorting to the endolysosomal system. Moreover, Na(+)K(+)-ATPase, a basolateral membrane protein, and Crumbs (Crb), a stalk membrane protein, were mistransported to the apical rhabdomeric microvilli in GPI-deficient photoreceptors. These results indicate that polarized sorting of integral membrane proteins at the TGN requires the synthesis and anchoring of GPI-anchored proteins. Little is known about the cellular biological consequences of GPI deficiency in animals in vivo. Our results provide new insights into the importance of GPI synthesis and aid the understanding of pathologies involving GPI deficiency.
Volume 140(2)
Pages 385-94
Published 2013-1-15
DOI 10.1242/dev.083683
PII 140/2/385
PMID 23250212
MeSH Animals Cell Membrane / metabolism Detergents / pharmacology Drosophila Proteins / metabolism Drosophila melanogaster / metabolism* Fluorescent Dyes / metabolism Gene Expression Regulation, Developmental* Glycosylphosphatidylinositols / metabolism* Immunohistochemistry / methods Kinetics Membrane Glycoproteins / metabolism Membrane Microdomains / metabolism Mutation Neurons / metabolism Photoreceptor Cells, Invertebrate / metabolism* Rhodopsin / metabolism* Sodium-Potassium-Exchanging ATPase / metabolism trans-Golgi Network / metabolism*
IF 5.611
Times Cited 14