OsKAT2 is the prevailing functional inward rectifier potassium channels in rice guard cell

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Unique Features of Two Potassium Channels, OsKAT2 and OsKAT3, Expressed in Rice Guard Cells

Potassium is the most abundant cation and a myriad of transporters regulate K(+) homeostasis in plant. Potassium plays a role as a major osmolyte to regulate stomatal movements that control water utility of land plants. Here we report the characterization of two inward rectifying shaker-like potassium channels, OsKAT2 and OsKAT3, expressed in guard cell of rice plants. While OsKAT2 showed typic...

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Potassium ions as vasodilators: role of inward rectifier potassium channels.

External potassium ions have long been known as mediators of vasodilation of several vascular beds, including the coronary and cerebral circulations.1–6 Indeed, potassium ions have been viewed as communicators of the metabolic state of the cells that surround blood vessels. For example, release of potassium ions from neurons is communicated through glial cells to regulate cerebral artery diamet...

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Inward rectifier potassium channels in the rat middle cerebral artery.

Inward rectifier K+ channels (Kirs) were studied in the isolated perfused rat middle cerebral artery (MCA). The addition of 15 mM K+ (KCl) to the extraluminal bath dilated the MCAs. These dilations were blocked by selective inhibitors for the Kirs (40 μM BaCl2 or 40 mM CsCl) but not selective inhibitors for other K+channels (glibenclamide, tetraethylammonium, or 4-aminopyridine). Neither remova...

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Long-pore Electrostatics in Inward-rectifier Potassium Channels

Inward-rectifier potassium (Kir) channels differ from the canonical K(+) channel structure in that they possess a long extended pore (approximately 85 A) for ion conduction that reaches deeply into the cytoplasm. This unique structural feature is presumably involved in regulating functional properties specific to Kir channels, such as conductance, rectification block, and ligand-dependent gatin...

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Descending vasa recta endothelia express inward rectifier potassium channels.

Descending vasa recta (DVR) are capillary-sized microvessels that supply blood flow to the renal medulla. They are composed of contractile pericytes and endothelial cells. In this study, we used the whole cell patch-clamp method to determine whether inward rectifier potassium channels (K(IR)) exist in the endothelia, affect membrane potential, and modulate intracellular Ca(2+) concentration ([C...

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ژورنال

عنوان ژورنال: Plant Signaling & Behavior

سال: 2013

ISSN: 1559-2324

DOI: 10.4161/psb.26643