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. 1986 Jan;80(1):130–133. doi: 10.1104/pp.80.1.130

Oxidase Reactions of Tomato Anionic Peroxidase 1

James L Brooks 1
PMCID: PMC1075069  PMID: 16664567

Abstract

Tomato (Lycopersicon esculentum Mill) anionic peroxidase was found to catalyze oxidase reactions with NADH, glutathione, dithiothreitol, oxaloacetate, and hydroquinone as substrates with a mean activity 30% that of horseradish peroxidase; this is in contrast to the negligible activity of the tomato enzyme as compared to the horseradish enzyme in catalyzing an indoleacetic acid-oxidase reaction with only Mn2+ and a phenol as cofactors. Substitution of Ce3+ for Mn2+ produced an 18-fold larger response with the tomato enzyme than with the horseradish enzyme, suggesting a significant difference in the autocatalytic indoleacetic acid-oxidase reactions with these two enzymes. In attempting to compare enzyme activities with 2,4-dichlorophenol as a cofactor, it was found that reaction rates increased exponentially with both increasing cofactor concentration and increasing enzyme concentration. While the former response may be analogous to allosteric control of enzyme activity, the latter response is contrary to the principle that reaction rate is proportional to enzyme concentration, and additionally makes any comparison of enzyme activity difficult.

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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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