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The sigma 28 kDa (σ28) factor is a transcription factor specific for the expression of bacterial flagellar and chemotaxis genes. Its antisigma factor, FlgM, binds σ28 factor and inhibits its activity as a transcription factor. In this study, crystals of the complex between Escherichia coli σ28 and the C-terminal σ28-binding region of FlgM were obtained. The crystals belong to space group P3121 or P3221, with unit-cell parameters a = b = 106.7 (2), c = 51.74 (3) Å, containing one complex in the crystallographic asymmetric unit. An X-ray intensity data set was collected to a resolution of 2.7 Å.

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