Buettner M J, Spitz E, Rickenberg H V
J Bacteriol. 1973 Jun;114(3):1068-73. doi: 10.1128/jb.114.3.1068-1073.1973.
The concentration of cyclic adenosine 3',5'-monophosphate (c-AMP) in Escherichia coli growing on different sources of carbon was studied. Cultures utilizing a source of carbon that supported growth relatively poorly had consistently higher concentrations of c-AMP than did cultures utilizing sugars that supported rapid growth. This relationship was also observed in strains defective in c-AMP phosphodiesterase and simultaneously resistant to catabolite repression; in such strains the c-AMP concentration was slightly higher for several sources of carbon tested. Cultures continued to synthesize c-AMP and secreted it into the medium, under conditions that brought about an inhibition of the intracellular accumulation of the cyclic nucleotide. Transient repression of the synthesis of beta-galactosidase was not associated with an abrupt decrease in the cellular concentration of c-AMP.
对在不同碳源上生长的大肠杆菌中3',5'-环磷酸腺苷(c-AMP)的浓度进行了研究。利用支持生长相对较差的碳源的培养物中,c-AMP的浓度始终高于利用支持快速生长的糖类的培养物。在c-AMP磷酸二酯酶缺陷且同时对分解代谢物阻遏有抗性的菌株中也观察到了这种关系;在这些菌株中,对于所测试的几种碳源,c-AMP浓度略高。在导致环核苷酸细胞内积累受到抑制的条件下,培养物继续合成c-AMP并将其分泌到培养基中。β-半乳糖苷酶合成的瞬时阻遏与细胞内c-AMP浓度的突然降低无关。