nolMNO genes of Bradyrhizobium japonicum are co-transcribed with nodYABCSUIJ, and nolO is involved in the synthesis of the lipo-oligosaccharide nodulation signals.

Abstract excerpt

A host-inducible lacZ fusion was mapped down-stream of the nodYABCSUIJ operon in Bradyrhizobium japonicum strain USDA110. Sequencing of this region identified three novel genes, nolMNO. RNA dot blot analysis showed that nolO transcription is nodD1-dependent and that a polar mutation in nodS, located 5 kilobases upstream of nolO, blocks the transcription of nolO. Coupled with the host-inducible nature of nolO...

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