Cation transport in Escherichia coli. VI. K exchange.
Cation transport in Escherichia coli. VI. K exchange.
复制标题
大肠杆菌的阳离子运输。 vi。 k交换。
DOI：
10.1085/jgp.49.3.469
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发表时间：
1966-01
影响因子：
3.8
通讯作者：
Schultz, S G
中科院分区：
文献类型：
--
作者：
Epstein, W;Schultz, S G
在氯霉素抑制的大肠杆菌悬浮液中测定了钾的内流和净钾通量。在稳定状态下的K交换速率是独立的介质中的K浓度超过200倍的范围。在许多实验条件下，交换速率可以显著增加或减少而不改变细胞K含量。这些结果表明，在这些条件下，K流入的变化与K流出的相等变化相关，并表明后一个过程至少部分是载体介导的，并且与流入过程紧密耦合。
K influx and net K flux have been measured in suspensions of chloramphenicol-arrested Escherichia coli. The rate of K exchange in the steady state was independent of the K concentration of the medium over a 200-fold range. Under a number of experimental conditions the rate of exchange may be considerably increased or decreased without changing the cellular K content. These results show that under these conditions changes in K influx are associated with equal changes in K efflux, and suggest that the latter process is, at least in part, both carrier-mediated and tightly coupled to the influx process.