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flagellar motor protein MotB
This is the MotB member of the E.coli MotA/MotB proton-channel complex that forms the stator of the bacterial membrane flagellar motor. Key residues act as a plug to prevent premature proton flow. The plug is in the periplasm just C-terminal to the MotB TM, consisting of an amphipathic alpha helix flanked by Pro-52 and Pro-65, eg in Swiss:D3V2T1. In addition to the Pro residues, Ile-58, Tyr-61, and Phe 62 are also essential for plug function [1][2]. [1]. 17052729. The Escherichia coli MotAB proton channel unplugged. Hosking ER, Vogt C, Bakker EP, Manson MD;. J Mol Biol. 2006;364:921-937. [2]. 14705929. Arrangement of core membrane segments in the MotA/MotB proton-channel complex of Escherichia coli. Braun TF, Al-Mawsawi LQ, Kojima S, Blair DF;. Biochemistry. 2004;43:35-45. (from Pfam)
OmpA family protein
The Pfam entry also includes MotB and related proteins which are not included in the Prosite family. (from Pfam)
flagellar motor protein MotB (motility protein B) is required for the rotation of the flagellar motor
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