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Regulation by External K+ in a Maize Inward Shaker Channel Targets Transport Activity in the High Concentration Range

Authors
  • Yan-Hua Su
  • Helen North
  • Claude Grignon
  • Jean-Baptiste Thibaud
  • Hervé Sentenac
  • Anne-Aliénor Véry
Publisher
American Society of Plant Biologists
Publication Date
May 01, 2005
Source
PMC
Keywords
License
Unknown

Abstract

Regulation by External K+ in a Maize Inward Shaker Channel Targets Transport Activity in the High Concentration Range by Yan-Hua Su, Helen North, Claude Grignon, Jean-Baptiste Thibaud, Hervé Sentenac, and Anne-Aliénor Véry Plantcell Volume 17(5):1532-1548 April 29, 2005 ©2005 by American Society of Plant Biologists Identification of ZmK2.1, a Maize Inward K+ Channel of the Shaker Family.(A) Topology of the ZmK2.1 polypeptide. Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Expression of ZmK2.1 in the Plant.(A) RNA gel blot analysis. Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Conduction and Gating Properties of ZmK2.1 Expressed in Xenopus Oocytes ([A] to [F]) or COS Cells ([G] to [I]).(A) Inwardly rectifying currents recorded in an oocyte expressing ZmK2.1. Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Effect of the Nature of the External Monovalent Cation on ZmK2.1 Conductance and Activity.(A) and (B) Currents mediated by ZmK2.1 in COS cells were recorded in bath solutions successively containing KCl, RbCl, LiCl, NaCl, and NH4Cl at a concentration of 50 ... Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Effect of External K+ Concentration on ZmK2.1 and KAT1 Activity.(A) and (B) Current traces recorded in COS cells expressing either ZmK2.1 (A) or KAT1 (B) in the presence of different external K+ concentrations: 50, 10, or 1 mM. Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Effect of External Ca2+ on ZmK2.1 Currents in COS Cells.(A) ZmK2.1 permeability to Ca2+. Su Y et al. Plantcell 2005;17:1532-1548 ©2005 by American Society of Plant Biologists Effect of External K+ Concentration on Maize and Arabidopsis Guard Cell Inwardly Rectifying Channel Activity.(A) and (D) Typical current traces recorded in maize (A) and Arabidopsis (D) guard cell protoplasts in bath solutions successively

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