Functionality and specific membrane localization of transport GTPases carrying C-terminal membrane anchors of synaptobrevin-like proteins

Ras-related guanine nucleotide-binding proteins of the Ypt/Rab family fulfill a pivotal role in vesicular protein transport both in yeast and in mammalian cells. Proper functioning of these proteins involves their cycling between a GTP- and a GDP-bound state as well as their reversible association w...

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Veröffentlicht in:The EMBO journal 1995-08, Vol.14 (15), p.3645-3653
Hauptverfasser: Ossig, R, Laufer, W, Schmitt, H.D, Gallwitz, D
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Laufer, W
Schmitt, H.D
Gallwitz, D
description Ras-related guanine nucleotide-binding proteins of the Ypt/Rab family fulfill a pivotal role in vesicular protein transport both in yeast and in mammalian cells. Proper functioning of these proteins involves their cycling between a GTP- and a GDP-bound state as well as their reversible association with specific membranes. Here we show that the yeast Ypt1 and Sec4 proteins, essential components of the vesicular transport machinery, allow unimpaired vesicular transport when permanently fixed to membranes by membrane-spanning domains replacing their two C-terminal cysteine residues. Membrane detachment of the GTPases therefore is not obligatory for transport vesicle docking to or fusion with an acceptor membrane. It was also found that the membrane anchors derived from different synaptobrevin-related proteins have targeting information and direct the chimeric GTPases to different cellular compartments, presumably from the endoplasmic reticulum via the secretory pathway.
doi_str_mv 10.1002/j.1460-2075.1995.tb00034.x
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subjects Amino Acid Sequence
amino acid sequences
beta-Fructofuranosidase
binding proteins
Biological Transport
Cell Membrane - metabolism
cell membranes
cytochemistry
Endoplasmic Reticulum - metabolism
Fungal Proteins - chemistry
Fungal Proteins - genetics
Fungal Proteins - metabolism
Glycoside Hydrolases - metabolism
Glycosylation
Golgi Apparatus - metabolism
GTP Phosphohydrolases - chemistry
GTP Phosphohydrolases - genetics
GTP Phosphohydrolases - metabolism
GTP-Binding Proteins - chemistry
GTP-Binding Proteins - genetics
GTP-Binding Proteins - metabolism
guanine nucleotides
guanosine diphosphate
guanosine triphosphate
guanosinetriphosphatase
Membrane Proteins - chemistry
membrane vesicles
Molecular Sequence Data
mutants
Nerve Tissue Proteins - chemistry
nucleotides
organelles
protein transport
pyrophosphatases
R-SNARE Proteins
rab GTP-Binding Proteins
Recombinant Fusion Proteins - metabolism
Saccharomyces cerevisiae
Saccharomyces cerevisiae - enzymology
Saccharomyces cerevisiae - metabolism
Saccharomyces cerevisiae Proteins
sec4 protein
ypt1 proteins
title Functionality and specific membrane localization of transport GTPases carrying C-terminal membrane anchors of synaptobrevin-like proteins
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