4.2.1.115 ? x * 63000, recombinant N-terminally His-tagged WbpM, SDS-PAGE, x * 64000, recombinant C-terminally His-tagged WbpM, SDS-PAGE, x * 60000, recombinant His-tagged truncated WbpM, SDS-PAGE 4.2.1.115 dimer 2 * 37400, recombinant His-tagged enzyme, SDS-PAGE 4.2.1.115 hexamer the enzyme possesses a hexameric doughnut-shaped quaternary structure, crystal stucture analysis 4.2.1.115 additional information FlaA1 is a short soluble protein that exhibits a typical SYK catalytic triad, structure-function analysis, overview 4.2.1.115 additional information WbpM is anchored to the inner membrane via four N-terminal transmembrane domains, whereas the C-terminal catalytic domain resided in the cytoplasm, topological model of WbpM, overview