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Part of the book series: Recent Advances in Phytochemistry ((RAPT,volume 28))

Abstract

Polyphenol oxidases (PPO) catalyze the one- and two- electron oxidation of phenols to quinones at the expense of O2. PPOs are copper metalloproteins catalyzing the o- hydroxylation of a monophenol, followed by its oxidation to the o-diquinone (cresolase activity), or the oxidation of an o-dihydroxyphenol to the o-diquinone (catecholase activity). The quinonoid reaction products formed by PPO are familiar to anyone who has homogenized plant tissues. PPO-generated quinones are highly reactive, electrophilic molecules which covalently modify and crosslink a variety of cellular constituents, including nucleophiles of proteins such as sulfhydryl, amine, amide, indole and imidazole substituents. The formation of quinone adducts (usually brown or black colored) represents the primary detrimental effect of PPO in food processing and postharvest physiology of plant products and is the primary reason for PPO’s importance in food technology.1 Conversely, the potential for quinones to covalently modify and reduce the nutritive value of plant proteins has also generated interest in PPO-based strategies to increase the herbivore resistance of plants.2 Although the function of PPO in plant metabolism is not well understood, the recent cloning of PPO presents opportunities to explore its function in plants as well as to explore the extent, to which its expression can be manipulated. The purpose of this paper is to review current progress toward understanding the structure and function of PPO, and to describe initial results of attempts to modify PPO expression.

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J.C.S. dedicates this chapter to the memory of Frederick Steffens

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Steffens, J.C., Harel, E., Hunt, M.D. (1994). Polyphenol Oxidase. In: Ellis, B.E., Kuroki, G.W., Stafford, H.A. (eds) Genetic Engineering of Plant Secondary Metabolism. Recent Advances in Phytochemistry, vol 28. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2544-8_11

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