Membrane transport in Caenorhabditis elegans: an essential role for VPS34 at the nuclear membrane

Here we present a detailed genetic analysis of let‐512/vps34 that encodes the Caenorhabditis elegans homologue of the yeast phosphatidylinositol 3‐kinase Vps34p. LET‐512/VPS34 has essential functions and is ubiquitously expressed in all tissues and developmental stages. It accumulates at a perinucle...

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Veröffentlicht in:The EMBO journal 2002-04, Vol.21 (7), p.1673-1683
Hauptverfasser: Roggo, Lorenz, Bernard, Vincent, Kovacs, Attila L., Rose, Ann M., Savoy, Fabienne, Zetka, Monique, Wymann, Matthias P., Müller, Fritz
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container_end_page 1683
container_issue 7
container_start_page 1673
container_title The EMBO journal
container_volume 21
creator Roggo, Lorenz
Bernard, Vincent
Kovacs, Attila L.
Rose, Ann M.
Savoy, Fabienne
Zetka, Monique
Wymann, Matthias P.
Müller, Fritz
description Here we present a detailed genetic analysis of let‐512/vps34 that encodes the Caenorhabditis elegans homologue of the yeast phosphatidylinositol 3‐kinase Vps34p. LET‐512/VPS34 has essential functions and is ubiquitously expressed in all tissues and developmental stages. It accumulates at a perinuclear region, and mutations in let‐512/vps34 result in an expansion of the outer nuclear membrane as well as in a mislocalization and subsequent complete lack of expression of LRP‐1, a C.elegans LDL receptor normally associated with the apical surface of hypodermal cells. Using a GFP::2xFYVE fusion protein we found that the phosphatidylinositol 3‐phosphate (PtdIns 3‐P) product of LET‐512/VPS34 is associated with a multitude of intracellular membranes and vesicles located at the periphery, including endocytic vesicles. We propose that LET‐512/VPS34 is required for membrane transport from the outer nuclear membrane towards the cell periphery. Thus, LET‐512/VPS34 may regulate the secretory pathway in a much broader range of compartments than was previously suggested for the yeast orthologue.
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subjects Amino Acid Sequence
Animals
Biological Transport
Caenorhabditis elegans
Caenorhabditis elegans - enzymology
Caenorhabditis elegans - genetics
Caenorhabditis elegans Proteins - genetics
Caenorhabditis elegans Proteins - metabolism
Cell Nucleus - metabolism
Developmental stages
EMBO20
Endocytosis - physiology
Gene Expression
membrane transport
Membranes
Molecular Sequence Data
Mutagenesis
Nuclear Envelope - metabolism
Phosphatidylinositol 3-Kinases - genetics
Phosphatidylinositol 3-Kinases - metabolism
PtdIns 3-kinase
Transport Vesicles - metabolism
Yeasts
title Membrane transport in Caenorhabditis elegans: an essential role for VPS34 at the nuclear membrane
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