The β-barrel assembly machinery (BAM) complex mediates the assembly of β-barrel membrane proteins in the outer membrane. BepA, formerly known as YfgC, interacts with the BAM complex and functions as a protease/chaperone for the enhancement of the ass ...
The β-barrel assembly machinery (BAM) complex mediates the assembly of β-barrel membrane proteins in the outer membrane. BepA, formerly known as YfgC, interacts with the BAM complex and functions as a protease/chaperone for the enhancement of the assembly and/or degradation of β-barrel membrane proteins. To elucidate the molecular mechanism underlying the dual functions of BepA, its full-length three-dimensional structure is needed. Here, we report the crystal structure of full-length BepA at 2.6-Å resolution. BepA possesses an N-terminal protease domain and a C-terminal tetratricopeptide repeat domain, which interact with each other. Domain cross-linking by structure-guided introduction of disulfide bonds did not affect the activities of BepA in vivo, suggesting that the function of this protein does not involve domain rearrangement. The full-length BepA structure is compatible with the previously proposed docking model of BAM complex and tetratricopeptide repeat domain of BepA.
Organizational Affiliation:
Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan. Electronic address: ttsukazaki@mac.com.,Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan.,Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan. Electronic address: yakiyama@infront.kyoto-u.ac.jp.,Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan.,Faculty of Nutritional Sciences, University of Morioka, Iwate 020-0694, Japan.
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