Document Detail

Expression of gamma-aminobutyric acid rho 1 and rho 1 Delta 450 as gene fusions with the green fluorescent protein.
MedLine Citation:
PMID:  11172056     Owner:  NLM     Status:  MEDLINE    
The functional characteristics and cellular localization of the gamma aminobutyric acid (GABA) rho 1 receptor and its nonfunctional isoform rho 1 Delta 450 were investigated by expressing them as gene fusions with the enhanced version of the green fluorescent protein (GFP). Oocytes injected with rho 1-GFP had receptors that gated chloride channels when activated by GABA. The functional characteristics of these receptors were the same as for those of wild-type rho 1 receptors. Fluorescence, because of the chimeric receptors expressed, was over the whole oocyte but was more intense near the cell surface and more abundant in the animal hemisphere. Similar to the wild type, rho 1 Delta 450-GFP did not lead to the expression of functional GABA receptors, and injected oocytes failed to generate currents even after exposure to high concentrations of GABA. Nonetheless, the fluorescence displayed by oocytes expressing rho 1 Delta 450-GFP was distributed similarly to that of rho 1-GFP. Mammalian cells transfected with the rho 1-GFP or rho 1 Delta 450-GFP constructs showed mostly intracellularly distributed fluorescence in confocal microscope images. A sparse localization of fluorescence was observed in the plasma membrane regardless of the cell line used. We conclude that rho 1 Delta 450 is expressed and transported close to, and perhaps incorporated into, the plasma membrane. Thus, rho 1- and rho 1 Delta 450-GFP fusions provide a powerful tool to visualize the traffic of GABA type C receptors.
A Martinez-Torres; R Miledi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2001-02-06
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  98     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2001 Feb 
Date Detail:
Created Date:  2001-02-26     Completed Date:  2001-04-19     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1947-51     Citation Subset:  IM    
Laboratory of Cellular and Molecular Neurobiology, Department of Neurobiology and Behavior, University of California, Irvine, CA 92697, USA.
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MeSH Terms
3T3 Cells
Artificial Gene Fusion
Cell Line
Gene Expression
Green Fluorescent Proteins
Luminescent Proteins / biosynthesis,  genetics,  physiology
Protein Isoforms / biosynthesis,  genetics,  physiology
Receptors, GABA / biosynthesis*,  genetics,  physiology
Receptors, GABA-B*
Xenopus laevis
gamma-Aminobutyric Acid / genetics,  metabolism
Reg. No./Substance:
0/GABA type B receptor, subunit 1; 0/GABRR2 protein, human; 0/Gabrr2 protein, mouse; 0/Luminescent Proteins; 0/Protein Isoforms; 0/Receptors, GABA; 0/Receptors, GABA-B; 147336-22-9/Green Fluorescent Proteins; 56-12-2/gamma-Aminobutyric Acid

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