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Titolo:
pH control of the plant outwardly-rectifying potassium channel SKOR
Autore:
Lacombe, B; Pilot, G; Gaymard, F; Sentenac, H; Thibaud, JB;
Indirizzi:
Univ Montpellier 2, INRA, CNRS, UMR 5004,Agro M, F-34060 Montpellier 1, France Univ Montpellier 2 Montpellier France 1 M, F-34060 Montpellier 1, France
Titolo Testata:
FEBS LETTERS
fascicolo: 2-3, volume: 466, anno: 2000,
pagine: 351 - 354
SICI:
0014-5793(20000128)466:2-3<351:PCOTPO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARABIDOPSIS-THALIANA; K+ CHANNEL; ABSCISIC-ACID; INTRACELLULAR PH; CYTOPLASMIC PH; GUARD-CELLS; VICIA-FABA; EXPRESSION; SHAKER; RECTIFIER;
Keywords:
K+ channel; pH; Xenopus oocyte; patch clamp; Arabidopsis thaliana;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Thibaud, JB Univ Montpellier 2, INRA, CNRS, UMR 5004,Agro M, Pl Viala, F-34060 Montpellier 1, France Univ Montpellier 2 Pl Viala Montpellier France 1 er 1, France
Citazione:
B. Lacombe et al., "pH control of the plant outwardly-rectifying potassium channel SKOR", FEBS LETTER, 466(2-3), 2000, pp. 351-354

Abstract

SKOR, an Arabidopsis depolarisation-activated K+-selective channel, was expressed in Xenopus oocytes, and external and internal pH effects were analysed. Internal pH was manipulated by injections of alkaline or acidic solutions or by acid load from acetate-containing medium. An internal pH decreasefrom 7.4 to 7.2 induced a strong (ca. 80%) voltage-independent decrease ofthe macroscopic SKOR current, the macroscopic gating parameters and the single channel conductance remained unchanged. An external acidification from7.4 to 6.4 had similar effects. It is proposed that pH changes regulate the number of channels available for activation. Sensitivity of SKOR activityto pH in the physiological range suggests that internal and external pH play a role in the regulation of K+ secretion into the xylem sap. (C) 2000 Federation of European Biochemical Societies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 11:14:57