Class 1 · Oxidoreductases 2009
DOI: 10.1007/978-3-540-85188-2_60
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Violaxanthin de-epoxidase

Abstract: Violaxanthin de-epoxidase catalyzes the de-epoxidation of violaxanthin to antheraxanthin and zeaxanthin in the xanthophyll cycle. Its activity is optimal at approximately pH 5.2 and requires ascorbate. In conjunction with the transthylakoid pH gradient, the formation of antheraxanthin and zeaxanthin reduces the photochemical efficiency of photosystem II by increasing the nonradiative (heat) dissipation of energy i n the antennae. Previously, violaxanthin de-epoxidase had been partially purified. Here we report… Show more

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