Activating Compound | Comment | Organism | Structure |
---|---|---|---|
SDS | PPO from membrane shows no diphenolase activity unless it is activated by trypsin or sodium dodecyl sulfate | Beta vulgaris | |
Trypsin | PPO from membrane shows no diphenolase activity unless it is activated by trypsin or sodium dodecyl sulfate, kinetics of the activation process of latent PPO by trypsin | Beta vulgaris |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | kinetics of the activation process of latent PPO by trypsin, Michaelis-Menten mechanism with double intermediate | Beta vulgaris |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
membrane | PPO from membrane shows no diphenolase activity unless it is activated by trypsin or sodium dodecyl sulfate | Beta vulgaris | 16020 | - |
soluble | solubel PPO isozyme | Beta vulgaris | - |
- |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Cu2+ | two Cu2+ ions per catalytic center | Beta vulgaris |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
32000 | - |
x * 36000, latent, nonactivated membrane isozyme, SDS-PAGE, x * 32000, trypsin-activated membrane isozyme, SDS-PAGE | Beta vulgaris |
36000 | - |
x * 36000, latent, nonactivated membrane isozyme, SDS-PAGE, x * 32000, trypsin-activated membrane isozyme, SDS-PAGE | Beta vulgaris |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Beta vulgaris | - |
red beet | - |
Posttranslational Modification | Comment | Organism |
---|---|---|
proteolytic modification | PPO from membrane shows no diphenolase activity unless it is roteolytically activated by trypsin, kinetics of the activation process of latent PPO by trypsin at pH 7.0 and 25°C | Beta vulgaris |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
root | - |
Beta vulgaris | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
dopamine + 1/2 O2 | - |
Beta vulgaris | dopamine quinone + H2O | - |
? | |
additional information | the enzyme catalyses two different reactions, each using molecular oxygen: the hydroxylation of monophenols to o-diphenols, monophenolase activity, and the oxidation of o-diphenols to o-quinones, diphenolase, overview | Beta vulgaris | ? | - |
? |
Subunits | Comment | Organism |
---|---|---|
? | x * 36000, latent, nonactivated membrane isozyme, SDS-PAGE, x * 32000, trypsin-activated membrane isozyme, SDS-PAGE | Beta vulgaris |
Synonyms | Comment | Organism |
---|---|---|
diphenolase | - |
Beta vulgaris |
More | cf. EC 1.14.18.1 | Beta vulgaris |
polyphenol oxidase | - |
Beta vulgaris |
PPO | - |
Beta vulgaris |
tyrosinase | - |
Beta vulgaris |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
25 | - |
assay at | Beta vulgaris |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
4.5 | - |
latent, nonactivated membrane isozyme | Beta vulgaris |
6.5 | - |
activated membrane isozyme | Beta vulgaris |
6.5 | 7 | latent, nonactivated soluble isozyme | Beta vulgaris |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
additional information | - |
pH profile for the trypsin-activated PPO, pH is a determining factor in the expression of enzyme activity, it alters the ionization state of amino acid side chains or of the substrate, overview | Beta vulgaris |