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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bendahan, A. Kanner, B. I. |
| Description | Author Affiliation: Kanner BI ( Department of Biochemistry, Hadassah Medical School, Hebrew University, Jerusalem, Israel.); |
| Abstract | Electrogenic sodium- and chloride-dependent gamma-aminobutyric acid (GABA) transport in crude synaptosomal membrane vesicles is partly inhibited by saturating levels of either of the substrate analogues cis-3-aminocyclohexanecarboxylic acid (ACHC) or beta-alanine. However, both of them together potently and fully inhibit the process. Transport of beta-alanine, which exhibits an apparent Km of about 44 microM, is also electrogenic and sodium and chloride dependent and competitively inhibited by GABA with a Ki of about 3 microM. This value is very similar to the Km of 2-4 microM found for GABA transport. On the other hand, ACHC does not inhibit beta-alanine transport at all. Upon solubilization of the membrane proteins with cholate and fractionation with ammonium sulfate, a fraction is obtained which upon reconstitution into proteoliposomes exhibits 4- to 10-fold-increased GABA transport. This activity is fully inhibited by low concentrations of ACHC and is not sensitive at all to beta-alanine. GABA transport in this preparation exhibits an apparent Km of about 2.5 microM and it is competitively inhibited by ACHC (Ki approximately 7 microM). These data indicate the presence of two GABA transporter subtypes in the membrane vesicles: the A type, sensitive to ACHC, and the B type, sensitive to beta-alanine. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 87 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1990-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Brain Metabolism Chlorides Pharmacology Membrane Proteins Membrane Transport Proteins Nerve Tissue Proteins Organic Anion Transporters Sodium Gamma-Aminobutyric Acid Animals Biological Transport Carrier Proteins Cell Membrane GABA Plasma Membrane Transport Proteins Kinetics Isolation & Purification Synaptosomes Beta-Alanine Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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