Synthesis of an opine-like compound, a rhizopine, in alfalfa nodules is symbiotically regulated.
- 1 December 1988
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 85 (23) , 9133-9137
- https://doi.org/10.1073/pnas.85.23.9133
Abstract
We show that the promoter of the mos locus, which encodes genes required for the synthesis of a nodule-specific, opine-like compound, a rhizopine, in alfalfa nodules is regulated by the symbiotic nitrogen-fixation regulatory gene nifA. The 5''-regulatory region and amino-terminal end of the first open reading frame of the mos locus are highly homologous to the 5''-regulatory region and amino-terminal portion of the Rhizobium meliloti nifH gene. The coordinate regulation of mos and nif genes suggests that the mos locus plays a symbiotic role. We propose that the rhizopine enhances the survival of the bacterial partner in the symbiosis.Keywords
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