Translocation of ProOmpA possessing an intramolecular disulfide bridge into membrane vesicles of Escherichia coli : effect of membrane energization

作者: K Tani , H Tokuda , S Mizushima

DOI: 10.1016/S0021-9258(17)44908-8

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摘要: In the absence of delta mu H+, in vitro translocation proOmpA resulted stable accumulation a possible intermediate addition to transiently accumulating one. The was detected on polyacrylamide gel as two proteinase K-resistant bands corresponding molecular weight about 28,000. appearance appreciably enhanced when oxidized with ferricyanide. No mature OmpA appeared. When reduced dithiothreitol used, other hand, did not appear at all. Upon replacement Cys302 Gly, abolished. treated labeled N-[3H]-ethylmaleimide, whereas that ferricyanide not. ferricyanide-treated translocated into membrane vesicles presence H+. thus and processed N-[3H]ethylmaleimide. It is concluded possessing Cys290-Cys302 disulfide bridge can be without cleavage bridge, H+ imposed. bridge-containing ATP-dependent, its conversion form blocked adenosine 5'-(beta, gamma-imino)triphosphate. early late stages reaction require ATP differently.

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