Syndet, an adipocyte target SNARE involved in the insulin-induced translocation of GLUT4 to the cell surface

Shane Rea; Laura B Martin; Shane McIntosh; S Lance Macaulay; Tracie Ramsdale; Giulia Baldini; David E James

doi:10.1074/jbc.273.30.18784

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Syndet, an adipocyte target SNARE involved in the insulin-induced translocation of GLUT4 to the cell surface

Journal article

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Syndet, an adipocyte target SNARE involved in the insulin-induced translocation of GLUT4 to the cell surface

Shane Rea, Laura B Martin, Shane McIntosh, S Lance Macaulay, Tracie Ramsdale, Giulia Baldini and David E James

The Journal of Biological Chemistry, Vol.273(30), pp.18784-18792

24/07/1998

DOI: https://doi.org/10.1074/jbc.273.30.18784

PMID: 9668052

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Abstract

3T3 Cells

Adipocytes - metabolism

Animals

Biological Transport, Active

Blotting, Western

Glucose Transporter Type 4

Glutathione Transferase - metabolism

Insulin - metabolism

Macromolecular Substances

Membrane Proteins - metabolism

Mice

Monosaccharide Transport Proteins - metabolism

Muscle Proteins

Nerve Tissue Proteins - metabolism

Protein Binding

Qa-SNARE Proteins

Qb-SNARE Proteins

Qc-SNARE Proteins

R-SNARE Proteins

Sodium Dodecyl Sulfate

Surface Properties

Surface-Active Agents

In adipocytes, insulin stimulates the translocation of the glucose transporter, GLUT4, from an intracellular storage compartment to the cell surface. Substantial evidence exists to suggest that in the basal state GLUT4 resides in discrete storage vesicles. A direct interaction of GLUT4 storage vesicles with the plasma membrane has been implicated because the v-SNARE, vesicle-associated membrane protein-2 (VAMP2), appears to be a specific component of these vesicles. In the present study we sought to identify the cognate target SNAREs for VAMP2 in mouse 3T3-L1 adipocytes. Membrane fractions were isolated from adipocytes and probed by far Western blotting with the cytosolic portion of VAMP2 fused to glutathione S-transferase. Two plasma membrane-enriched proteins, p25 and p35, were specifically labeled with this probe. By using a combination of immunoblotting, detergent extraction, and anion exchange chromatography, we identified p35 as Syntaxin-4 and p25 as the recently identified murine SNAP-25 homologue, Syndet (mSNAP-23). By using surface plasmon resonance we show that VAMP2, Syntaxin-4, and Syndet form a ternary SDS-resistant SNARE complex. Microinjection of anti-Syndet antibodies into 3T3-L1 adipocytes, or incubation of permeabilized adipocytes with a synthetic peptide comprising the C-terminal 24 amino acids of Syndet, inhibited insulin-stimulated GLUT4 translocation to the cell surface by approximately 40%. GLUT1 trafficking remained unaffected by the presence of the peptide. Our data suggest that Syntaxin-4 and Syndet are important cell-surface target SNAREs within adipocytes that regulate docking and fusion of GLUT-4-containing vesicles with the plasma membrane in response to insulin.

Details

Title: Syndet, an adipocyte target SNARE involved in the insulin-induced translocation of GLUT4 to the cell surface
Creators: Shane Rea - University of Queensland
Laura B Martin
Shane McIntosh - University of Queensland
S Lance Macaulay - CSIRO
Tracie Ramsdale - University of Queensland
Giulia Baldini - Columbia University
David E James
Publication Details: The Journal of Biological Chemistry, Vol.273(30), pp.18784-18792
Identifiers: 991013019534102368
Copyright: This is an Open Access article under the CC BY license.
Academic Unit: Faculty of Science and Engineering
Language: English
Resource Type: Journal article

Syndet, an adipocyte target SNARE involved in the insulin-induced translocation of GLUT4 to the cell surface

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