Second system for potassium transport in Streptococcus faecalis
Second system for potassium transport in Streptococcus faecalis
复制标题
粪链球菌钾转运的第二系统
DOI：
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发表时间：
1982
影响因子：
3.2
通讯作者：
H. Kobayashi
中科院分区：
文献类型：
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作者：
H. Kobayashi
It has been reported that the accumulation of K+ by Streptococcus faecalis is mediated by a transport system which required both ATP and the proton motive force (Bakker and Harold, J. Biol. Chem. 255:433-440, 1980). My results indicate that S. faecalis has a second transport system for K+. The features of this system are as follows: (i) the system is driven by ATP (or a derivative of ATP) and does not require the proton motive force; (ii) the system is normally absent in the wild-type strain but can be derepressed by lowering rhe intracellular concentration of K+; (iii) the pH optimum of this system is about 8.5, and no detectable K+ is accumulated at pH values below 6.5; and (iv) the rate of Rb+ accumulation by this system is very low. These properties are quite different from those of the transport system described by Bakker and Harold. Therefore, I propose that S. faecalis has two K+ transport systems.
