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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)
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