Deamination of L-ornithine to L-proline by ornithine cyclodeaminase is an unusual enzyme reaction that has been shown to occur in only a few bacteria. Rhizobium meliloti strains GR4, 2011 and 41 are able to use ornithine as the sole carbon and nitrogen source. The main pathway of ornithine utilization in strain GR4 depends on ornithine cyclodeaminase activity. In addition, this enzymatic activity has been found to be dependent on NAD+ and L-arginine similar to Agrobacterium ornithine cyclodeaminases. The ornithine cyclodeaminase activity is also expressed in R. meliloti strains 2011 and 41 growing with L-ornithine.
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Soto et al. (1994) studied this question.
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