Ion Specificity of Na+-Transporting Systems in the Plasma Membrane of the Halotolerant Alga Tetraselmis (Platymonas) viridis |
| |
Authors: | Pagis L Ya Popova L G Andreev I M Balnokin Yu V |
| |
Institution: | (1) Moscow State University, Moscow, Russia;(2) Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya ul. 35, Moscow, 127276, Russia |
| |
Abstract: | Vesicular preparations of plasma membranes (PM) from the microalga Tetraselmis (Platymonas) viridisRouch were used to investigate the ion specificity of the Na+/H+antiporter and Na+-translocating ATPase, two Na+-transporting systems previously identified functionally by our studies of T. viridisPM. The Na+/H+antiporter and Na+-ATPase were shown to translocate, with similar efficiencies, Na+and Li+across the membrane, whereas other cations, such as K+, Rb+, and Cs+, were not transported by these systems. Transport of the latter cations across PM of T. viridisoccurred through the ion channels of PM, which were apparently selective for K+. |
| |
Keywords: | Tetraselmis viridis Na+-ATPase Na+/H+antiporter ion specificity ion channels ion pumps marine microalgae plasmalemma |
本文献已被 SpringerLink 等数据库收录! |
|