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Science 1 May 1992:
Vol. 256. no. 5057, pp. 663 - 665
DOI: 10.1126/science.1585180
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Articles

Science, Vol 256, Issue 5057, 663-665
Copyright © 1992 by American Association for the Advancement of Science

articles

Cloning and expression in yeast of a plant potassium ion transport system

H Sentenac, N Bonneaud, M Minet, F Lacroute, JM Salmon, F Gaymard, and C Grignon

Biochimie et Physiologie Vegetales, ENSA-M/INRA/CNRS URA 573, Montpellier, France.

A membrane polypeptide involved in K+ transport in a higher plant was cloned by complementation of a yeast mutant defective in K+ uptake with a complementary DNA library from Arabidopsis thaliana. A 2.65-kilobase complementary DNA conferred ability to grow on media with K+ concentration in the micromolar range and to absorb K+ (or 86Rb+) at rates similar to those in wild-type yeast. The predicted amino acid sequence (838 amino acids) has three domains: a channel-forming region homologous to animal K+ channels, a cyclic nucleotide-binding site, and an ankyrin-like region.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)