Add time:08/31/2019         Source:sciencedirect.com

The phosphorylated FixJ transcriptional activator is key to nitrogen fixation in Sinorhizobium meliloti, switching both the nifA and fixK genes on. Previously no consensus picture emerged concerning the nature of FixJ binding sites. Here we used in vitro DNA selection in order to systematically characterise FixJ binding sequences. This led to the definition of two classes of sites. Class I sites share the CTAAGTAGTTTCCC sequence found in the fixK promoter, whereas class II sites are defined by a GTAMGTAG consensus octamer. Our results indicate that FixJ∼P binds DNA following two distinct binding modes.

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