GLUT4 Recycles Via a Trans-Golgi Network (TGN) Subdomain Enriched in Syntaxins 6 and 16 but Not TGN38: Involvement of an Acidic Targeting Motif

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2003 Mar 13

PMID 12631717

Citations 92

Authors

Annette M Shewan

Ellen M van Dam

Sally Martin

Tang Bor Luen

Wanjin Hong

Nia J Bryant

David E James

Affiliations

Soon will be listed here.

Abstract

Insulin stimulates glucose transport in fat and muscle cells by triggering exocytosis of the glucose transporter GLUT4. To define the intracellular trafficking of GLUT4, we have studied the internalization of an epitope-tagged version of GLUT4 from the cell surface. GLUT4 rapidly traversed the endosomal system en route to a perinuclear location. This perinuclear GLUT4 compartment did not colocalize with endosomal markers (endosomal antigen 1 protein, transferrin) or TGN38, but showed significant overlap with the TGN target (t)-soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) Syntaxins 6 and 16. These results were confirmed by vesicle immunoisolation. Consistent with a role for Syntaxins 6 and 16 in GLUT4 trafficking we found that their expression was up-regulated significantly during adipocyte differentiation and insulin stimulated their movement to the cell surface. GLUT4 trafficking between endosomes and trans-Golgi network was regulated via an acidic targeting motif in the carboxy terminus of GLUT4, because a mutant lacking this motif was retained in endosomes. We conclude that GLUT4 is rapidly transported from the cell surface to a subdomain of the trans-Golgi network that is enriched in the t-SNAREs Syntaxins 6 and 16 and that an acidic targeting motif in the C-terminal tail of GLUT4 plays an important role in this process.

Citing Articles

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