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About: Polyphenol oxidase     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Unit109465459, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: ThingBiomoleculeBiomoleculeEnzymeyago:WikicatCopperEnzymesyago:Abstraction100002137yago:Activator114723079yago:Catalyst114723628yago:Chemical114806838yago:Compound114818238yago:Enzyme114732946yago:Macromolecule114944888yago:Material114580897yago:Matter100020827yago:Molecule114682133yago:OrganicCompound114727670yago:Part113809207yago:PhysicalEntity100001930yago:Protein114728724yago:Relation100031921chemical compoundenzymeyago:Substance100019613yago:Thing100002452yago:Unit109465459 New Facet based on Instances of this Class

Polyphenol oxidase (PPO; also polyphenol oxidase i, chloroplastic), an enzyme involved in fruit browning, is a tetramer that contains four atoms of copper per molecule. PPO may accept monophenols and/or o-diphenols as substrates. The enzyme works by catalyzing the o-hydroxylation of monophenol molecules in which the benzene ring contains a single hydroxyl substituent to o-diphenols (phenol molecules containing two hydroxyl substituents at the 1, 2 positions, with no carbon between). It can also further catalyse the oxidation of o-diphenols to produce o-quinones. PPO catalyses the rapid polymerization of o-quinones to produce black, brown or red pigments (polyphenols) that cause fruit browning.