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1.10.3.1: catechol oxidase

This is an abbreviated version!
For detailed information about catechol oxidase, go to the full flat file.

Word Map on EC 1.10.3.1

Reaction

2 catechol +

O2
= 2 1,2-benzoquinone + 2 H2O

Synonyms

1,2-benzene: oxygen oxidoreductase, 1,2-benzenediol:oxygen oxidoreductase, AoCO4, catalase-phenol oxidase, catechol oxidase, catecholase, catecholoxidase, CATPO, CO, copper-S100B, cresolase, dihydroxy-L-phenylalanine:oxygen oxidoreductase, Diphenol oxidase, diphenolase, dopa oxidase, germin-like protein, GLP, hemocyanin, ibCO, LsPPO, mettyrosinase, monophenol, o-diphenol: oxygen oxidoreductase, monophenol, o-diphenol:oxygen oxidoreductase, More, MppO, o-diphenol oxidoreductase, o-diphenol: dioxygen oxidoreductase, dehydrogenating, o-diphenol:oxygen oxidoreductase, o-diphenolase, o-diphenoloxidase, oxytyrosinase, phenol oxidase, phenolase, phenoloxidase, polyphenol oxidase, polyphenoloxidase, PPO, PPO 1, PPO 2, PPO II, PPO-6, pyrocatechol oxidase, TYR3, tyrosinase

ECTree

     1 Oxidoreductases
         1.10 Acting on diphenols and related substances as donors
             1.10.3 With oxygen as acceptor
                1.10.3.1 catechol oxidase

pH Stability

pH Stability on EC 1.10.3.1 - catechol oxidase

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pH STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
2.5 - 3.5
-
purified enzyme, most unstable at, less than 10% activity remaining after 2 h
675167
3 - 10
-
the enzyme is stable within pH 8.0-10.0, retaining more than 80% of its activity. The enzyme is almost unstable and inactive when pH is below 3.0, only remaining less than 20% of its activity
727570
3 - 6
-
at pH 6.0, all cultivars are stable with an increase of activity from 6 to 8% around 30 min, but at 120 min the activity decreases by about 30%. At pH 3.0, PPO activity decreases quickly and strongly (about 60% after 120 min of treatment), whereas at pH 4.0 it is quite stable in each cultivar (about 20% after 120 min of treatment)
712219
4
-
1 h, purified recombinant enzyme, complete loss of activity
673560
4.5
-
purified enzyme, over 50% activity reamining after 24 h
675167
4.6 - 6.3
-
unstable below pH 3.0 and above pH 6.6, loss of 50% activity at both pH 2.4 and pH 7.0
440428
5 - 11
5 - 6
-
enzyme retains 95% of its activity
701760
5 - 7.5
5.6 - 6.5
-
purified enzyme, most stable at, over 50% remaining activity after 72 h
675167
6
-
purified enzyme, most stable at, unstable at acidic pH
673785
6 - 7
-
enzyme retains 95% of its activity
701760
7
-
stable at
673560
8 - 8.5
-
purified enzyme, over 50% activity reamining after 24 h
675167
9
-
purified enzyme, over 50% activity reamining after 4 h
675167
additional information
-
highest activity and stability within a neutral and alkaline pH range
673560