分解代谢物阻遏及环腺苷酸在根瘤菌属二氧化碳固定和氢气代谢中的作用
Catabolite repression and role of cyclic AMP in CO2 fixation and H2 metabolism in Rhizobium spp.
作者信息
McGetrick A M, Goulding C F, Manian S S, O'Gara F
出版信息
J Bacteriol. 1985 Sep;163(3):1282-4. doi: 10.1128/jb.163.3.1282-1284.1985.
Abstract
CO2 fixation in Rhizobium meliloti was repressed by a variety of organic carbon sources. Cellular cyclic AMP levels were similar in repressed and nonrepressed cultures. Exogenous cyclic AMP or additional copies of the adenyl cyclase gene in cells experiencing repression failed to affect the rates of CO2 fixation. However, in R. japonicum catabolite repression of H2 utilization was partially circumvented by the presence of the R. meliloti adenyl cyclase gene.
摘要
多种有机碳源可抑制苜蓿根瘤菌中的二氧化碳固定。在受抑制和未受抑制的培养物中，细胞内环磷酸腺苷（cAMP）水平相似。在受抑制的细胞中，添加外源环磷酸腺苷或额外拷贝的腺苷酸环化酶基因，均无法影响二氧化碳固定速率。然而，在日本根瘤菌中，苜蓿根瘤菌腺苷酸环化酶基因的存在可部分规避对氢气利用的分解代谢物抑制。
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