Midgley M, Dawes E A
Biochem J. 1973 Feb;132(2):141-54. doi: 10.1042/bj1320141.
The methyl alpha-glucoside-transport system of Pseudomonas aeruginosa has been characterized with respect to its specificity, energy-dependence, kinetics and regulation. The uptake of glucose involved two components, one of which transported glucose (K(m)=8mum) and methyl alpha-glucoside (K(m)=2.8mm) whereas the other was more complex, involving the extracellular activity of glucose dehydrogenase. Mutants defective in this enzyme have been isolated and characterized. The methyl alpha-glucoside-glucose-transport system was repressed when the organism was grown in the absence of glucose; the induction of this transport system by glucose, and its activity once induced, were inhibited by products of citrate metabolism.
铜绿假单胞菌的α-甲基葡糖苷转运系统已在特异性、能量依赖性、动力学和调节方面进行了表征。葡萄糖的摄取涉及两个组分,其中一个转运葡萄糖(K(m)=8μm)和α-甲基葡糖苷(K(m)=2.8mm),而另一个则更为复杂,涉及葡萄糖脱氢酶的胞外活性。已分离并表征了该酶缺陷的突变体。当生物体在无葡萄糖的情况下生长时,α-甲基葡糖苷-葡萄糖转运系统受到抑制;该转运系统被葡萄糖诱导,且一旦被诱导,其活性会受到柠檬酸代谢产物的抑制。