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. 1978 Sep;62(3):363–367. doi: 10.1104/pp.62.3.363

Characterization of the Enzyme Responsible for Nopaline and Ornaline Synthesis in Sunflower Crown Gall Tissues 1

Dennis W Sutton 1, John D Kemp 1, Ethan Hack 1
PMCID: PMC1092127  PMID: 16660518

Abstract

Extracts prepared from sunflower (Helianthus annuus L.) crown gall tissues induced by Agrobacterium tumefaciens strains C58 and T37 (nopaline utilizers) catalyze the synthesis of nopaline and ornaline. These compounds are not synthesized in extracts of crown gall tissues induced by strains B6, 15955 (octopine utilizers), and AT1 (utilizes neither octopine nor nopaline) or in extracts of habituated sunflower callus. Both synthetic activities require NADPH, α-ketoglutarate, and either arginine or ornithine; histidine and lysine will not substitute. Incorporation of arginine or ornithine into product is inhibited by the other substrate but not by histidine or lysine. On the basis of inhibition and Km data, both activities appear to be catalyzed by one enzyme and the same enzyme is apparently present in crown gall tissues induced by strains C58 and T37.

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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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