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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Englesberg, E. Mcdonough, A. Qian, N. X. Jones, M. |
| Description | Author Affiliation: Qian NX ( Department of Biological Sciences, University of California, Santa Barbara 93106.); |
| Abstract | A constitutive mutant, alar4, for the A system of amino acid transport, has increased activity and amount of the A system. This is accompanied by increased sensitivity to ouabain, as measured by efficiency of plating, and increased activity and abundance of the Na+,K+-ATPase that is present in the parental cell line, CHO-K1 (wild type). The latter was shown by increases in (i) ouabain-inhibitable 86Rb uptake in intact cells, (ii) ouabain-inhibitable ATPase activity in mixed membrane vesicles, and (iii) number of ouabain-binding sites and by similar Kd values for ouabain binding and K1/2 for ouabain inhibition of Na+,K+-ATPase as compared to the wild type. The increase in abundance of the Na+ pump is associated with a 4-fold increase in abundance of the mRNA for the alpha 1 subunit of the Na+,K+-ATPase. We could not detect mRNA for alpha 2 or alpha 3 or for the beta subunits. The increase in abundance of the A system and Na+,K+-ATPase is associated with a negligible increase in intracellular Na+ concentration. We propose that the increase in the abundance of the A system and the Na+,K+-ATPase is the result of a mutation in regulatory gene R1 that controls the A system and the Na+,K+-ATPase and is not due to a primary effect of a possible initial increase in Na+ concentration. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 86 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1989-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acids Metabolism Mutation RNA, Messenger Genetics Sodium-Potassium-Exchanging ATPase Animals Biological Transport Cell Line Cell Membrane Enzymology Gene Expression Kinetics Macromolecular Substances Ouabain Pharmacology Potassium Biosynthesis Rubidium Sodium 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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