期刊论文详细信息
Structural insight into the role of the Ton complex in energy transduction
Article
关键词: ESCHERICHIA-COLI;    OUTER-MEMBRANE;    PERIPLASMIC DOMAIN;    PSEUDOMONAS-AERUGINOSA;    CONFORMATIONAL-CHANGES;    PROTONMOTIVE FORCE;    CRYSTAL-STRUCTURE;    FLAGELLAR MOTOR;    TERMINAL DOMAIN;    EXBB-EXBD;   
DOI  :  10.1038/nature19757
来源: SCIE
【 摘 要 】

In Gram-negative bacteria, outer membrane transporters import nutrients by coupling to an inner membrane protein complex called the Ton complex. The Ton complex consists of TonB, ExbB, and ExbD, and uses the proton motive force at the inner membrane to transduce energy to the outer membrane via TonB. Here, we structurally characterize the Ton complex from Escherichia coli using X-ray crystallography, electron microscopy, double electron-electron resonance (DEER) spectroscopy, and crosslinking. Our results reveal a stoichiometry consisting of a pentamer of ExbB, a dimer of ExbD, and at least one TonB. Electrophysiology studies show that the Ton subcomplex forms pH-sensitive cation-selective channels and provide insight into the mechanism by which it may harness the proton motive force to produce energy.

【 授权许可】

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