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Science 31 August 1990:
Vol. 249. no. 4972, pp. 1023 - 1026
DOI: 10.1126/science.1975705
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Articles

Science, Vol 249, Issue 4972, 1023-1026
Copyright © 1990 by American Association for the Advancement of Science

articles

Alteration of alpha 1 Na+,K(+)-ATPase 86Rb+ influx by a single amino acid substitution

VL Herrera and N Ruiz-Opazo

Section of Molecular Genetics, Whitaker Cardiovascular Institute, Boston University School of Medicine, MA 02118.

The sodium- and potassium-dependent adenosine triphosphatase (Na+,K(+)-ATPase) maintains the transmembrane Na+ gradient to which is coupled all active cellular transport systems. The R and S alleles of the gene encoding the Na+,K(+)-ATPase alpha 1 subunit isoform were identified in Dahl salt-resistant (DR) and Dahl salt-sensitive (DS) rats, respectively. Characterization of the S allele-specific Na+,K(+)-ATPase alpha 1 complementary DNA identified a leucine substitution of glutamine at position 276. This mutation alters the hydropathy profile of a region in proximity to T3(Na), the trypsin-sensitive site that is only detected in the presence of Na+. This mutation causes a decrease in the rubidium-86 influx of S allele-specific sodium pumps, thus marking a domain in the Na+,K(+)-ATPase alpha subunit important for K+ transport, and supporting the hypothesis of a putative role of these pumps in hypertension.


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