Cloned (Comment) | Organism |
---|---|
expression of Fe-QDO in Escherichia coli | Bacillus subtilis |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | kinetics, modeling, overview | Bacillus subtilis | |
0.004 | - |
quercetin | pH 7.0, temperature not specified in the publication | Bacillus subtilis |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Co2+ | can partly substitute for Mn2+ | Bacillus subtilis | |
Cu2+ | can partly substitute for Mn2+ | Bacillus subtilis | |
Fe2+ | can partly substitute for Mn2+ | Bacillus subtilis | |
HNO | nitrosyl hydride replaces dioxygen in nitroxygenase activity of manganese quercetin dioxygenase resulting in the incorporation of both N and O atoms into the product. Turnover is demonstrated by consumption of quercetin and other related substrates under anaerobic conditions in the presence of HNO-releasing compounds and the enzyme. As with dioxygenase activity, a nonenzymatic base-catalyzed reaction of quercetin with HNO isobserved above pH 7, but no enhancement of this basal reactivity is found upon addition of divalent metal salts. Unique and regioselective N-containing products are characterized by MS analysis for both the enzymatic and nonenzymatic reactions | Bacillus subtilis | |
Mn2+ | preferred divalent metal ion | Bacillus subtilis | |
additional information | the enzyme from Bacillus subtilis is active with several divalent metal cofactors such as Fe, Mn, and Co, although Mn(II) is the preferred cofactor for this enzyme | Bacillus subtilis | |
Ni2+ | can partly substitute for Mn2+. Nickel is a poor cofactor. | Bacillus subtilis |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
quercetin + O2 | Bacillus subtilis | quercetin dioxygenase catalyzes the oxidation of the flavonol quercetin with dioxygen, cleaving the central heterocyclic ring and releasing CO | 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO + H+ | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Bacillus subtilis | - |
- |
- |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
quercetin + O2 | - |
Bacillus subtilis | 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO + H+ | - |
? | |
quercetin + O2 | quercetin dioxygenase catalyzes the oxidation of the flavonol quercetin with dioxygen, cleaving the central heterocyclic ring and releasing CO | Bacillus subtilis | 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO + H+ | - |
? |
Synonyms | Comment | Organism |
---|---|---|
Co-QDO | - |
Bacillus subtilis |
Fe-QDO | - |
Bacillus subtilis |
manganese quercetin dioxygenase | - |
Bacillus subtilis |
Mn-QDO | - |
Bacillus subtilis |
QDO | - |
Bacillus subtilis |
quercetin dioxygenase | - |
Bacillus subtilis |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7 | - |
assay at | Bacillus subtilis |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
additional information | - |
nonenzymatic, basal reactivity of sodium trioxodinitrate/Na2N2O3 (Angeli's salt) as HNO donor with quercetin initiates above pH 7.0 | Bacillus subtilis |
kcat/KM Value [1/mMs-1] | kcat/KM Value Maximum [1/mMs-1] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
33000 | - |
quercetin | pH 7.0, temperature not specified in the publication | Bacillus subtilis |