TtsI, a key regulator of Rhizobium species NGR234 is required for type III-dependent protein secretion and synthesis of rhamnose-rich polysaccharides.


Formation of nitrogen-fixing nodules on legume roots by Rhizobium sp. NGR234 requires an array of bacterial factors, including nodulation outer proteins (Nops) secreted through a type III secretion system (TTSS). Secretion of Nops is abolished upon inactivation of ttsI (formerly y4xI), a protein with characteristics of two-component response regulators that… (More)


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