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Polyphenoloxidase
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Phenolase, genauer chloroplastische Polyphenoloxidase (PPO), auch Catecholoxidase I, heiΓt das Homolog der Tyrosinase in Pflanzen. ZusΓ€tzlich zu den Reaktionen der Tyrosinase ist sie in der Lage, Phenole und Catechole zu oxidieren. Diese Reaktionen sorgen fΓΌr die BrΓ€unung von Pflanzenmaterial nach Verletzung und Kontakt mit Luftsauerstoff. Die entstehenden Chinone sind giftig fΓΌr pathogene Mikroorganismen.cite-ref-1[1]
Contents
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Enzymatische Katalyse
Bei der Oxidation von Brenzcatechin in Anwesenheit von Phenolase als Katalysator wird das Dihydroxybenzol in Benzochinon umgewandelt:
Einzelnachweise
cite-note-11. β Mayer AM: Polyphenol oxidases in plants and fungi: going places? A review. In: Phytochemistry. 67. Jahrgang, Nr. 21, November 2006, S. 2318β2331, doi:10.1016/j.phytochem.2006.08.006, PMID 16973188.