苜蓿根瘤菌中的类分解代谢物阻遏现象。
Catabolite-repression-like phenomenon in Rhizobium meliloti.
作者信息
Ucker D S, Signer E R
出版信息
J Bacteriol. 1978 Dec;136(3):1197-200. doi: 10.1128/jb.136.3.1197-1200.1978.
Abstract
We report a phenomenon similar to catabolite repression in Rhizobium meliloti. Succinate, which allows the highest observed rate of growth of R. meliloti, caused an immediate reduction of beta-galactosidase activity when added to cells growing in lactose. A Lac- mutant was unaltered in nodulation and nitrogen fixation capacities, but a pleiotropic mutant deficient in several catabolic properties was unable to produce effective nitrogen-fixing nodules.
摘要
我们报道了一种与苜蓿根瘤菌中分解代谢物阻遏相似的现象。琥珀酸能使苜蓿根瘤菌达到所观察到的最高生长速率，当将其添加到在乳糖中生长的细胞中时，会立即导致β-半乳糖苷酶活性降低。一个Lac-突变体在结瘤和固氮能力方面未发生改变，但一个缺乏几种分解代谢特性的多效性突变体无法产生有效的固氮根瘤。
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