磷酸盐对大肠杆菌摄取己糖的刺激作用。
The stimulation by salts of hexose phosphate uptake by Escherichia coli.
作者信息
Essenberg R C
出版信息
Biochem J. 1987 Apr 15;243(2):345-50. doi: 10.1042/bj2430345.
Hexose phosphate uptake in Escherichia coli is stimulated by salts. KCl and MgCl2 stimulate to about the same extent, but Mg2+ is effective at a tenth the concentration of K+. At higher concentrations, both salts inhibit. The stimulation by a series of salts correlates strongly with the hydrated radius of the cation, with small ions more effective than large. There are effects by the anion, but they do not correlate with any simple property. Cells accumulate glucose 6-phosphate to a higher concentration in the presence of KCl than in its absence. The maximum velocity of glucose 6-phosphate uptake is stimulated by KCl, as is the ratio V/Km.
大肠杆菌中磷酸己糖的摄取受到盐类的刺激。氯化钾和氯化镁的刺激程度大致相同，但镁离子在浓度为钾离子十分之一时就有效。在较高浓度下，两种盐都会产生抑制作用。一系列盐类的刺激作用与阳离子的水合半径密切相关，小离子比大离子更有效。阴离子也有影响，但与任何简单特性都不相关。在有氯化钾存在的情况下，细胞积累的葡萄糖 6-磷酸浓度比不存在时更高。氯化钾可刺激葡萄糖 6-磷酸摄取的最大速度，V/Km 比值也受到刺激。
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