Potassium-selective channel in the red beet vacuolar membrane
نویسندگان
چکیده
منابع مشابه
Effect of sodium on potassium fluxes at the cell membrane and vacuole membrane of red beet.
Slices of red beet (Beta vulgaris) washed for 5 to 6 days are known to accumulate Na(+) in preference to K(+) from solutions containing both ions. The present work, using ion concentrations of 1.0 mm or less, with Ca(2+) added in some cases, shows that Na(+) strongly inhibits K(+) influx at the cell membrane (plasmalemma) while K(+) efflux is increased to a lesser extent. This result from compa...
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The flux ratio (influx/efflux) of K(+) across the plasmalemma of beet cells at an external potassium concentration of 0.6 mm does not respond to changes of membrane potential in the manner expected for the free diffusion of ions. The K(+) efflux is affected by the presence of adsorbed Ca(2+), but is apparently unrelated to the electrical potential or to the net uptake of potassium. The K(+) eff...
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Sodium (Na) movement between plants and humans is one of the more critical aspects of bioregenerative systems of life support, which NASA is studying for the establishment of long-term bases on the Lunar or Martian surface. This study was conducted to determine the extent to which Na can replace potassium (K) in red beet (Beta vulgaris L. ssp vulgaris) without adversely affecting metabolic func...
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Radiation inactivation of the red beet (Beta vulgaris L.) plasma membrane ATPase was carried out using -y-ray radiation from a '37Cs source. Inactivation of vanadate-sensitive ATPase activity by y-ray radiation followed an exponential decline with increasing total dose, indicating a single target size calculated to have a molecular weight of about 228,000. Since the catalytic subunit of the red...
متن کاملCharacterization of the solubilized plasma membrane ATPase of red beet.
The plasma membrane ATP-phosphohydrolase (ATPase) from red beet (Beta vulgaris L.) storage tissue was solubilized with the zwitterionic detergent Zwittergent 3-14 from a plasma membrane-enriched fraction which was extracted with the anionic detergent, sodium deoxycholate. For both the extraction of extraneous proteins by deoxycholate and the solubilization of active plasma membrane ATPase by Zw...
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ژورنال
عنوان ژورنال: Journal of Experimental Botany
سال: 2003
ISSN: 1460-2431
DOI: 10.1093/jxb/erg067