ABSTRACT
In
Escherichia coli
, the use of carnitine as a terminal electron acceptor depends on a functional
caiTABCDE
operon. It had been suggested that the adjacent but divergent
fixABCX
operon is also required for carnitine metabolism, perhaps to provide electrons for carnitine reduction. We have constructed
E. coli fixA
and
fixB
mutants and find that they are unable to reduce carnitine to γ-butyrobetaine under anaerobic conditions.
摘要
在
大肠杆菌中
中,肉碱作为末端电子受体的使用取决于功能性的
caiTABCDE
操作子。有人认为,相邻但不同的
fixABCX
操作子也是肉碱代谢所必需的,也许是为肉碱还原提供电子。我们构建了
大肠杆菌 fixA
和
突变体
突变体,发现它们无法在厌氧条件下将肉碱还原为 γ-丁卡因。