PMID: 8981973Jan 1, 1997Paper

Transcriptional regulation and locations of Agrobacterium tumefaciens genes required for complete catabolism of octopine

Journal of Bacteriology
K ChoS C Winans

Abstract

By screening for octopine-inducible gene expression, we previously identified all the genes required for utilization of octopine as a source of carbon, nitrogen, and energy. They are (i) octopine oxidase, which converts octopine to arginine and pyruvate and is encoded by the ooxAB operon, (ii) arginase, which converts arginine to ornithine and urea and is encoded by arcA, (iii) ornithine cyclodeaminase, which converts ornithine to proline and ammonia and is encoded by the homologous arcB and ocd genes, and (iv) proline dehydrogenase, which converts proline to glutamate and is encoded by putA. Here we describe the regulation and localization of each of these genes. The ooxA-ooxB-ocd operon was previously shown to reside on the Ti plasmid and to be directly inducible by octopine. The arcAB operon is directly inducible by arginine, while it is induced by octopine only in strains that can convert octopine to arginine. Ornithine may also be a direct inducer of arcAB. putA is directly inducible by proline, while induction by octopine and by arginine (and probably by ornithine) requires their conversion to proline. Genetic studies indicate that arcAB and putA are localized on a conjugal genetic element. This element can be transferred...Continue Reading

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Citations

Apr 29, 1999·Proceedings of the National Academy of Sciences of the United States of America·J Zhu, S C Winans
Jun 8, 2012·Evolution; International Journal of Organic Evolution·Thomas G PlattJames D Bever
Jun 28, 2003·Molecular Microbiology·Katherine M Pappas, Stephen C Winans
Aug 2, 2001·Proceedings of the National Academy of Sciences of the United States of America·M J BarnettS R Long
Dec 1, 2000·Applied and Environmental Microbiology·S VílchezJ L Ramos
Oct 6, 2005·Applied and Environmental Microbiology·Lynn L WilliamsonJo Handelsman
Jun 24, 2021·FEMS Microbiology Reviews·Victor M HernándezMichael F Dunn

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