Cloned (Comment) | Organism |
---|---|
gene ppoA, the full-length and truncated enzyme is overexpressed in Escherichia coli strain Rosetta 2(DE3) and BL21(DE3) with and without a C-terminal His6-tag, method optimization, overview | Marinomonas mediterranea |
Protein Variants | Comment | Organism |
---|---|---|
additional information | elimination of the N-terminal sequence in mutant rMmPPOA-637 decreases the specific activity 15fold, which is partially restored in the presence of 1 M NaCl, and alters the secondary and tertiary structures and the pH dependence of optimal stability | Marinomonas mediterranea |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
additional information | the recombinant His-tagged MmPPOA-695 shows a strong resistance to NaCl, DMSO, and Tween-80 | Marinomonas mediterranea |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | Michaelis-Menten kinetics | Marinomonas mediterranea | |
0.011 | - |
catechol | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea | |
0.018 | - |
catechol | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
0.022 | - |
catechol | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
0.172 | - |
2,6-dimethoxyphenol | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
0.293 | - |
2,6-dimethoxyphenol | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.163 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.263 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.413 | - |
2,6-dimethoxyphenol | recombinant mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea | |
1.478 | - |
catechol | recombinant mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea | |
1.84 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea | |
1.98 | - |
2,6-dimethoxyphenol | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea | |
3.295 | - |
2,6-dimethoxyphenol | recombinant His-tagged mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
membrane | membrane-bound. Adding nonionic detergents (Triton X100 and Tween-20) does not solubilize the enzyme from the cell membrane. The highest solubilization of MmPPOA is achieved by adding 1% SDS to the lysis buffer | Marinomonas mediterranea | 16020 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Cu2+ | a multi-copper laccase | Marinomonas mediterranea | |
NaCl | native wild-type MmPPOA and recombinant wild-type MmPPOA-695-His (both the crude extract and the pure enzyme preparations) retain substantial part of the enzymatic activity in the presence of 1 M NaCl, while recombinant mutant His-tagged MmPPOA-637 activity shows a 90% decrease at 100 mM NaCl and about 20% increase at 1 M NaCl | Marinomonas mediterranea |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Marinomonas mediterranea | Q9KJB8 | - |
- |
Marinomonas mediterranea MMB-1 | Q9KJB8 | - |
- |
Purification (Comment) | Organism |
---|---|
recombinant His6-tagged wild-type and truncated mutant enzymes from Escherichia coli strain Rosetta 2(DE3) and BL21(DE3) by nickel affinity chromatography, dialysis, ultrafiltration, gel filtration, and again dialysis. The wild-type enzyme is purified by 16fold, the mutant enzyme by 3fold | Marinomonas mediterranea |
Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|
1.34 | - |
purified recombinant enzyme, substrate 2,6-dimethoxyphenol, pH 5.0, 25°C | Marinomonas mediterranea |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
2 catechol + O2 | - |
Marinomonas mediterranea | 2 1,2-benzoquinone + 2 H2O | - |
? | |
2 catechol + O2 | - |
Marinomonas mediterranea MMB-1 | 2 1,2-benzoquinone + 2 H2O | - |
? | |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) + O2 | - |
Marinomonas mediterranea | ? | - |
? | |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) + O2 | - |
Marinomonas mediterranea MMB-1 | ? | - |
? | |
2,6-dimethoxyphenol + O2 | - |
Marinomonas mediterranea | ? | - |
? | |
2,6-dimethoxyphenol + O2 | - |
Marinomonas mediterranea MMB-1 | ? | - |
? | |
additional information | the enzyme shows broad substrate specificity. The recombinant His-tagged MmPPOA-695 shows kinetic properties on catechol higher than for known laccases. Laccase belongs to the group of blue, multicopper oxidases which couple the four-electron reduction of dioxygen to water with the oxidation of a broad range of substrates (including phenols, polyphenols, arylamines, anilines, hydroxyindols, and thiols) | Marinomonas mediterranea | ? | - |
? | |
additional information | the enzyme shows broad substrate specificity. The recombinant His-tagged MmPPOA-695 shows kinetic properties on catechol higher than for known laccases. Laccase belongs to the group of blue, multicopper oxidases which couple the four-electron reduction of dioxygen to water with the oxidation of a broad range of substrates (including phenols, polyphenols, arylamines, anilines, hydroxyindols, and thiols) | Marinomonas mediterranea MMB-1 | ? | - |
? |
Subunits | Comment | Organism |
---|---|---|
? | x * 70000, recombinant His-tagged MmPPOA-637 mutant, SDS-PAGE | Marinomonas mediterranea |
Synonyms | Comment | Organism |
---|---|---|
laccase | - |
Marinomonas mediterranea |
MmPPO laccase | - |
Marinomonas mediterranea |
MmPPOA | - |
Marinomonas mediterranea |
More | cf. EC 1.14.18.1 | Marinomonas mediterranea |
polyphenol oxidase A | - |
Marinomonas mediterranea |
PpoA | - |
Marinomonas mediterranea |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
25 | - |
assay at | Marinomonas mediterranea |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
additional information | - |
the recombinant His-tagged MmPPOA-695 shows a very high thermal stabilit | Marinomonas mediterranea |
90 | - |
above, high thermal stability of purified wild-type rMmPPOA-695-His and mutant rMmPPOA-637-His enzymes | Marinomonas mediterranea |
100 | - |
inactivation through protein unfolding. The enzyme is refolded at 25°C but rests catalytically inactive | Marinomonas mediterranea |
Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.084 | - |
catechol | recombinant mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea | |
0.1 | - |
2,6-dimethoxyphenol | recombinant mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea | |
0.21 | - |
2,6-dimethoxyphenol | recombinant His-tagged mutant enzyme MmPPOA-637, pH 5.0, 25°C | Marinomonas mediterranea | |
0.92 | - |
2,6-dimethoxyphenol | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.53 | - |
catechol | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.74 | - |
2,6-dimethoxyphenol | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
1.98 | - |
2,6-dimethoxyphenol | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea | |
2 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
2.18 | - |
catechol | recombinant His-tagged enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
2.5 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | recombinant wild-type enzyme MmPPOA-695, pH 5.0, 25°C | Marinomonas mediterranea | |
4.2 | - |
catechol | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea | |
4.5 | - |
2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) | native wild-type enzyme, pH 5.0, 25°C | Marinomonas mediterranea |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
3 | 9 | recombinant wild-type enzyme, broad optimum | Marinomonas mediterranea |
4 | - |
recombinant mutant enzyme MmPPOA-637 | Marinomonas mediterranea |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
3 | 8 | recombinant mutant enzyme MmPPOA-637, inactivation at pH 8.0 and above | Marinomonas mediterranea |
3 | 9 | recombinant wild-type enzyme, active range and broad optimum | Marinomonas mediterranea |
General Information | Comment | Organism |
---|---|---|
malfunction | elimination of the N-terminal sequence decreases the specific activity 15fold, which is partially restored in the presence of 1 M NaCl, and alters the secondary and tertiary structures and the pH dependence of optimal stability | Marinomonas mediterranea |
additional information | the enzyme has a high redox potential | Marinomonas mediterranea |