Several DNA regions encoding two-component sensor-response regulator systems have been isolated. The nucleotide sequence of a 9 kb region carrying rmlACD (involved in dTDP rhamnose synthesis) and dctBDPQM (involved in dicarboxylic acid transport) was determined. This region shared high identify with the locus AE004929 of Pseudomonas aeruginosa PAOl, except that the order of rml genes was changed. Inactivation of dctBD genes led a mutant strain impaired in utilization of succinate and fumarate, but growth with malate was not impaired. The efficiency of colonization of the rice root system by the dct mutant was decreased.
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