Remote Coupled Drastic beta-Barrel to beta-Sheet Transition of the Protein Translocation Motor.
Furukawa, A., Nakayama, S., Yoshikaie, K., Tanaka, Y., Tsukazaki, T.(2018) Structure 26: 485-489.e2
- PubMed: 29398525 
- DOI: https://doi.org/10.1016/j.str.2018.01.002
- Primary Citation of Related Structures:  
5YHF - PubMed Abstract: 
The membrane protein SecDF, belonging to the RND superfamily, enhances protein translocation at the extracytoplasmic side using a proton gradient. Here, we report the crystal structure of SecDF in a form we named Super-membrane-facing (Super F) form, demonstrating a β-barrel architecture instead of the previously reported β-sheet structure. Through this structural insight and supporting results of an in vivo crosslinking experiment, we propose a remote coupling model in which a structural change of the transmembrane region drives a functional, extracytoplasmic conformational transition.
Organizational Affiliation: 
Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan.