THE ATP-DRIVEN NA+-PUMP IN THE PLASMA-MEMBRANE OF THE MARINE UNICELLULAR ALGA, PLATYMONAS-VIRIDIS

被引:28
作者
BALNOKIN, YV
POPOVA, LG
机构
[1] Laboratory of Salt Exchange and Salt Tolerance, Plant Physiology Institute, Russian Academy of Science, 127276 Moscow
关键词
NA+-PUMP; PLASMALEMMA; MARINE ALGA; PLATYMONAS VIRIDIS;
D O I
10.1016/0014-5793(94)80607-1
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The ATP-supported (22)NA(+) uptake by plasma membrane vesicles from the marine microalga, Platymonas viridis, was studied. At pH 7 in the medium, Na+ uptake did not occur in the presence of ATP although Delta pH across the plasma membrane was generated. The ATP-dependent Na+ uptake was induced by adding the protonophore, CICCP. At pH 8, Na+ uptake took place when ATP was added even without CICCP. The Delta pH generated across the plasma membrane was negligible under these conditions. The Na+ uptake at pH 8 was not affected by C1CCP and amiloride, an inhibitor of the Na+/H+ antiporter. It is concluded that the ATP-supported Na+ uptake by PI. viridis vesicles is catalyzed by Na+-ATPase.
引用
收藏
页码:61 / 64
页数:4
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