GSBS Student Publications

Title

Evidence that functional erythrocyte-type glucose transporters are oligomers

GSBS Program

Biochemistry & Molecular Pharmacology

UMMS Affiliation

Program in Molecular Medicine; Graduate School of Biomedical Sciences; Department of Biochemistry and Molecular Pharmacology

Date

10-25-1991

Document Type

Article

Medical Subject Headings

3T3 Cells; Animals; Blotting, Western; Cell Membrane; Cells, Cultured; Chimera; Cricetinae; Cricetulus; Erythrocytes; Humans; Mice; Monosaccharide Transport Proteins; Rats; Restriction Mapping; Transfection

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

In this study we tested the hypothesis that functional erythrocyte-type glucose transporters (GLUT1) exist as oligomeric complexes by expressing chimeric transporter proteins in Chinese hamster ovary cells harboring endogenous GLUT1 transporters. The chimeric transporters were GLUT1-4c, in which the 29 C-terminal residues of human GLUT1 were replaced by the 30 C-terminal residues of rat skeletal muscle glucose transporter (GLUT4), and GLUT1n-4, containing the N-terminal 199 residues of GLUT1 and the 294 C-terminal residues of GLUT4. Endogenous GLUT1 was quantitatively co-immunoprecipitated by using an anti-GLUT4 C-terminal peptide antibody from detergent extracts of Chinese hamster ovary cells expressing either of the chimeric proteins, as detected by immunoblotting the precipitates with an anti-GLUT1 C-terminal peptide antiserum. No co-immunoprecipitation of native GLUT1 with native GLUT4 from extracts of 3T3-L1 adipocytes, which contain both these transporters, was observed with the same antibody. These data are consistent with the hypothesis that GLUT1 transporters exist as homodimers or higher order oligomers and that a major determinant of oligomerization is located within the first 199 residues of GLUT1.

Rights and Permissions

Citation: J Biol Chem. 1991 Oct 25;266(30):20213-7.

Related Resources

Link to article in PubMed

Journal Title

The Journal of biological chemistry

PubMed ID

1939082