Humbert R, Brusilow W S, Gunsalus R P, Klionsky D J, Simoni R D
J Bacteriol. 1983 Jan;153(1):416-22. doi: 10.1128/jb.153.1.416-422.1983.
Plasmids carrying cloned segments of the unc operon of Escherichia coli have been used in genetic complementation analyses to identify three independent mutants defective in the uncH gene, which codes for the delta subunit of the ATP synthetase. Mutations in other unc genes have also been mapped by this technique. ATPase activity was present in extracts of the uncH mutants, but the enzyme was not as tightly bound to the membrane as it was in the parental strain. ATP-dependent membrane energization was absent in membranes isolated from the uncH mutants and could not be restored by adding normal F1 ATPase from the wild-type strain. F1 ATPase prepared from uncH mutants could not restore ATP-dependent membrane energization when added to wild-type membranes depleted of F1. Membranes of the uncH mutants were not rendered proton permeable as a result of washing with low-ionic-strength buffer.
携带大肠杆菌unc操纵子克隆片段的质粒已用于遗传互补分析,以鉴定uncH基因中有缺陷的三个独立突变体,该基因编码ATP合成酶的δ亚基。其他unc基因中的突变也已通过该技术进行定位。uncH突变体的提取物中存在ATP酶活性,但该酶与膜的结合不如亲本菌株紧密。从uncH突变体中分离的膜中不存在ATP依赖性膜能量化,并且不能通过添加野生型菌株的正常F1 ATP酶来恢复。当添加到耗尽F1的野生型膜中时,从uncH突变体制备的F1 ATP酶不能恢复ATP依赖性膜能量化。用低离子强度缓冲液洗涤后,uncH突变体的膜不会变得质子可渗透。