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Rrp2 is the sole sigma(54)-dependent transcriptional activator present in the Borrelia burgdorferi genome. We showed that recombinant Rrp2 binds to DNA in a sequence-nonspecific manner. During infection, Rrp2 activates sigma(54)-dependent rpoS expression without an apparent upstream enhancer element commonly associated with other sigma(54)-dependent transcriptional activators.
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Blevins et al. (2009) studied this question.
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