荚膜红假单胞菌谷氨酰胺营养缺陷型中固氮酶活性的去阻遏作用
Derepression of nitrogenase activity in glutamine auxotrophs of Rhodopseudomonas capsulata.
作者信息
Wall J D, Gest H
出版信息
J Bacteriol. 1979 Mar;137(3):1459-63. doi: 10.1128/jb.137.3.1459-1463.1979.
Abstract
In contrast to wild-type cells, glutamine auxotrophs of the photosynthetic bacterium Rhodopseudomonas capsulata synthesize nitrogenase, produce H2 (catalyzed by nitrogenase), and continue to reduce dinitrogen to ammonia in the presence of exogenous NH4+. The glutamine synthetase activity of such mutants is less than 2% of that observed in the wild type. It appears that glutamine synthetase plays a significant role in regulation of nitrogenase synthesis in R. capsulata.
摘要
与野生型细胞相比，光合细菌荚膜红假单胞菌的谷氨酰胺营养缺陷型合成固氮酶、产生氢气（由固氮酶催化），并且在存在外源NH4+的情况下继续将氮气还原为氨。这类突变体的谷氨酰胺合成酶活性不到野生型的2%。看来谷氨酰胺合成酶在荚膜红假单胞菌固氮酶合成的调控中起重要作用。
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