Dictionary » P » Polyphenol oxidase

Polyphenol oxidase

Definition

noun

A copper-containing enzyme that catalyzes the o-hydroxylation of monophenols to o-diphenols, as well as the oxidation of o-diphenols to o-quinones.


Supplement

This enzyme is found commonly in fruits. It is responsible for the fruits to turn brown. The rapid polymerization of o-quinones results in the formation of black, brown or red pigments (polyphenols), which cause fruit browning.

Tyrosine may also be oxidized by the action of polyphenol oxidase to form o-quinone. Hence, polyphenol oxidase may also be referred to as tyrosinase.

Word origin: Greek, polýs, many + phenol.

Abbreviation: POP

Synonyms:

See also: phenol oxidase.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Re: Catechol Oxidase, Polyphenol Oxidase and Tyrosinase

Complete and the full length cDNA sequence of poly phenol oxidase, cDNA from grape Vitis vinifera L., cv Grenache, was found to encode a translated protein of amino acids with an expected molecular weight of ca.kDa and a predicted pI of 6.83. The translated ...

See entire post
by aricpole
Thu Apr 22, 2010 6:28 pm
 
Forum: Molecular Biology
Topic: Catechol Oxidase, Polyphenol Oxidase and Tyrosinase
Replies: 6
Views: 7982

Catechol Oxidase, Polyphenol Oxidase and Tyrosinase

Hi, Are Catechol Oxidase, Polyphenol Oxidase and Tyrosinase the same enzyme? Many thanks JT80

See entire post
by JTeighty
Tue Apr 20, 2010 9:37 pm
 
Forum: Molecular Biology
Topic: Catechol Oxidase, Polyphenol Oxidase and Tyrosinase
Replies: 6
Views: 7982

Biology Hangman Game

... a few days and thus would be keeping the game on halt. But anyway... polyphenol oxidase Now my word. Biochemical pathway. -----------------

See entire post
by MrMistery
Wed Jul 09, 2008 8:42 am
 
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 582
Views: 192093

Re: Polyphenol oxidase???

You want to use a blender to break the cells of a potatoes, or several. Then use a centrifuge to separate the supernatant liquid from the pellet, this liquid will contain the enzyme that naturally occurs in potatoes... Hope this helps.

See entire post
by mzaks
Sat Mar 29, 2008 5:33 pm
 
Forum: Molecular Biology
Topic: Polyphenol oxidase???
Replies: 2
Views: 1733

Polyphenol oxidase???

... hard obstacle to get rid of. My partner and I are trying to find out if polyphenol oxidase in the potato can prevent E.Coli from attaching its cells to the chemical substance's. ...

See entire post
by shana23
Fri Nov 10, 2006 10:52 pm
 
Forum: Molecular Biology
Topic: Polyphenol oxidase???
Replies: 2
Views: 1733


This page was last modified 01:11, 29 November 2008. This page has been accessed 20,191 times. 
What links here | Related changes | Permanent link