Potassium-selective channel in the red beet vacuolar membrane.
In higher plants the vacuolar K(+)-selective (VK) channel was identified solely in guard cells. This patch-clamp study describes a 40 pS homologue of the VK channel in Beta vulgaris taproot vacuoles. This voltage-independent channel is activated by submicromolar Ca(2+), and is ideally selective for K(+) over Cl(-) and Na(+).
Pottosin
Igor I
II
Centro Universitario de Investigaciones Biomedicas, Universidad de Colima, 28047 Colima, Col., México. pottosin@cgic.ucol.mx
Martínez-Estévez
Manuel
M
Dobrovinskaya
Oxana R
OR
Muñiz
Jesús
J
D027461:Beta vulgaris / Q000378:metabolism*; D002118:Calcium / Q000494:pharmacology; D002712:Chlorides / Q000378:metabolism; D007425:Intracellular Membranes / Q000187:drug effects / Q000378:metabolism*; D008564:Membrane Potentials / Q000187:drug effects; D018408:Patch-Clamp Techniques; D011188:Potassium / Q000378:metabolism; D015221:Potassium Channels / Q000502:physiology*; D012964:Sodium / Q000378:metabolism; D014617:Vacuoles / Q000187:drug effects / Q000378:metabolism*
D002712:Chlorides; D015221:Potassium Channels; D012964:Sodium; D011188:Potassium; D002118:Calcium