Abstract
Mycobacterium tuberculosis has multiple σ factors which enable the bacterium to reprogram its transcriptional machinery under diverse environmental conditions. σ(J), an extracytoplasmic function σ factor, is upregulated in late stationary phase cultures and during human macrophage infection. σ(J) governs the cellular response to hydrogen peroxide-mediated oxidative stress. σ(J) differs from other canonical σ factors owing to the presence of a SnoaL_2 domain at the C-terminus. σ(J) crystals belonged to the tetragonal space group I422, with unit-cell parameters a = b = 133.85, c = 75.08 Å. Diffraction data were collected to 2.16 Å resolution on the BM14 beamline at the European Synchrotron Radiation Facility (ESRF).
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