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. 1986 Apr;166(1):44–50. doi: 10.1128/jb.166.1.44-50.1986

Arginine catabolism in Agrobacterium strains: role of the Ti plasmid.

Y Dessaux, A Petit, J Tempé, M Demarez, C Legrain, J M Wiame
PMCID: PMC214554  PMID: 3957872

Abstract

We present a study of the enzymatic activities involved in the pathway for arginine catabolism by Agrobacterium tumefaciens. Nitrogen from arginine is recovered through the arginase-urease pathway; the genes for these two activities are probably chromosomally born. Arginase was found to be inducible during growth in the presence of arginine or ornithine. Urease was constitutively expressed. Ornithine, resulting from the action of arginase on arginine, could be used as a nitrogen source via transamination to delta 1-pyrroline-5-carboxylate and reduction of the latter compound to proline by a reductase (both enzymatic activities are probably chromosomally encoded). Ornithine could also be used as a carbon source. Thus, we identified an ornithine cyclase activity that was responsible for direct conversion of ornithine to proline. This activity was found to be Ti plasmid encoded and inducible by growth in medium containing octopine or nopaline. The same activity was also chromosomally encoded in some Agrobacterium strains. In such strains, this activity was inducible during growth in arginine-containing medium.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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