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FliL is an inner membrane protein, occupying a position between the rotor and the stator of the bacterial flagellar motor. Its proximity to, and interactions with, the MS (membrane and supramembranous) ring, the switch complex and the stator proteins MotA/B suggests a role in recruitment and/or stabilization of the stator around the rotor, although the precise role of FliL in the flagellum remains to be established. In this study, recombinant C-terminal domain of Helicobacter pylori FliL (amino-acid residues 81-183) has been expressed in Escherichia coli and purified to &gt; 98% homogeneity. Purified recombinant protein behaved as a monomer in solution. Crystals were obtained by the hanging-drop vapour-diffusion method using ammonium phosphate monobasic as a precipitant. These crystals belong to space group P1, with unit-cell parameters a = 62.5, b = 82.6, c = 97.8 Å, α = 67.7,  = 83.4, γ = 72.8°. A complete data set has been collected to 2.8 Å resolution using synchrotron radiation. This is an important step towards elucidation of the function of FliL in the bacterial flagellar motor.

bioscience trends

Purification, crystallization and preliminary X-ray crystallographic studies on the C-terminal domain of the flagellar protein FliL from &lt;i&gt;Helicobacter pylori &lt;/i&gt;