JOURNAL OF BACTERIOLOGY, vol.193, no.2, pp.575-579, 2011 (Journal Indexed in SCI)
sigma(D) proteins from Aeribacillus pallidus AC6 and Bacillus subtilis bound specifically, albeit weakly, to promoter DNA even in the absence of core RNA polymerase. Binding required a conserved CG motif within the -10 element, and this motif is known to be recognized by sigma region 2.4 and critical for promoter activity.