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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >cAMP receptor protein-cAMP plays a crucial role in glucose-lactose diauxie by activating the major glucose transporter gene in Escherichia coli
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cAMP receptor protein-cAMP plays a crucial role in glucose-lactose diauxie by activating the major glucose transporter gene in Escherichia coli

机译:cAMP受体蛋白-cAMP通过激活大肠杆菌中主要的葡萄糖转运蛋白基因在葡萄糖-乳糖双糖中起关键作用

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摘要

The inhibition of β-galactosidase expression in a medium containing both glucose and lactose is a typical example of the glucose effect in Escherichia coli. We studied the glucose effect in the lacL8UV5 promoter mutant, which is independent of cAMP and cAMP receptor protein (CRP). A strong inhibition of β-galactosidase expression by glucose and a diauxic growth were observed when the lacL8UV5 cells were grown on a glucose-lactose medium. The addition of isopropyl β-D-thiogalactoside to the culture medium eliminated the glucose effect. Disruption of the crr gene or overproduction of LacY also eliminated the glucose effect.
机译:在含有葡萄糖和乳糖的培养基中抑制β-半乳糖苷酶表达是大肠杆菌中葡萄糖作用的典型例子。我们研究了lacL8UV5启动子突变体中的葡萄糖效应,该突变体独立于cAMP和cAMP受体蛋白(CRP)。当lacL8UV5细胞在葡萄糖-乳糖培养基上生长时,观察到葡萄糖对β-半乳糖苷酶表达的强烈抑制作用和双生生长。向培养基中添加异丙基β-D-硫代半乳糖苷消除了葡萄糖作用。 crr基因的破坏或LacY的过量产生也消除了葡萄糖作用。

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