Inhibitors | Comment | Organism | Structure |
---|---|---|---|
2-mercaptoethanol | competitive | Urtica dioica | |
benzoic acid | noncompetitive | Urtica dioica | |
glutathione | competitive | Urtica dioica | |
L-ascorbic acid | competitive | Urtica dioica | |
L-cysteine chloride | competitive | Urtica dioica | |
salicylic acid | uncompetitive | Urtica dioica | |
Sodium azide | noncompetitive | Urtica dioica | |
Sodium cyanide | noncompetitive | Urtica dioica | |
Sodium diethyl dithiocarbamate | cstrong competitive inhibitor | Urtica dioica | |
Sodium metabisulfite | competitive | Urtica dioica | |
Thiourea | competitive | Urtica dioica |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.54 | - |
trans-cinnamic acid | pH 3.5, 25°C | Urtica dioica | |
0.79 | - |
L-tyrosine | pH 4.5, 25°C | Urtica dioica | |
21.4 | - |
L-Dopa | pH 3.5, 25°C | Urtica dioica |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Urtica dioica | - |
two isozymes | - |
Purification (Comment) | Organism |
---|---|
native enzyme 17.8fold by (NH4)2SO4 precipitation, dialysis, and ion exchange chromatography | Urtica dioica |
Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|
42.57 | - |
purified enzyme | Urtica dioica |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
4-cresol + O2 | - |
Urtica dioica | ? | - |
? | |
L-tyrosine + L-dopa + O2 | high activity, best substrate | Urtica dioica | L-dopa + dopaquinone + H2O | - |
? | |
additional information | substrate specificity, overview, activity with phenolic and diphenolic substrates, also performing the reaction of tyrosinase, a ortho-hydroxylation of monophenols, EC 1.14.18.1, and the oxidation of catechols to ortho-quinones, the diphenolase activity, EC 1.10.3.1, overview | Urtica dioica | ? | - |
? | |
trans-cinnamic acid + O2 | - |
Urtica dioica | ? | - |
? |
Synonyms | Comment | Organism |
---|---|---|
More | cf. EC 1.10.3.1 | Urtica dioica |
polyphenol oxidase | - |
Urtica dioica |
PPO | - |
Urtica dioica |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
30 | 65 | dependent on the substrate, overview | Urtica dioica |
Temperature Minimum [°C] | Temperature Maximum [°C] | Comment | Organism |
---|---|---|---|
5 | 80 | - |
Urtica dioica |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
80 | - |
purified enzyme, complete inactivation within 3 min | Urtica dioica |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
3.5 | 4.5 | dependent on the substrate, overview | Urtica dioica |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
3 | 5.5 | - |
Urtica dioica |
Ki Value [mM] | Ki Value maximum [mM] | Inhibitor | Comment | Organism | Structure |
---|---|---|---|---|---|
0.00000179 | - |
Sodium diethyl dithiocarbamate | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.00137 | - |
L-cysteine chloride | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.0131 | - |
benzoic acid | pH 6.5, 35°C | Urtica dioica | |
0.0164 | - |
Sodium metabisulfite | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.0168 | - |
L-ascorbic acid | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.074 | - |
Sodium cyanide | pH 6.5, 35°C | Urtica dioica | |
0.084 | - |
2-mercaptoethanol | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.213 | - |
Thiourea | pH 6.5, 35°C, versus L-tyrosine | Urtica dioica | |
0.25 | - |
Sodium azide | pH 6.5, 35°C | Urtica dioica | |
0.67 | - |
salicylic acid | pH 6.5, 35°C | Urtica dioica |