Protein Variants | Comment | Organism |
---|---|---|
E730A | crystal structure determination and analysis, comparison with wild-type enzyme structure, the sulfido is replaced with an oxo ligand in the inactive E730A mutant, further showing another oxo and one Mo-OH ligand at Mo, which are independent of pH | Rhodobacter capsulatus |
additional information | the enzyme mutants show alterations in the Mo site structure, which changes in a pH range of 5-10, and in the influence of amino acids (Glu730 and Gln179) close to molybdenum cofactor in wild-type, and Q179A and E730A mutants, enzyme kinetics and quantum chemical studies, overview | Rhodobacter capsulatus |
Q179A | crystal structure determination and analysis, comparison with wild-type enzyme structure, a similar acidic pK for the wild-type and Q179A variants, as well as the metrical parameters of the Mo site and density functional theory calculations, suggested protonation at the equatorial oxo group. Oxidized wild-type and mutant Q179A reveal a similar Mo(VI) ion with each one molybdopterin, Mo=O, Mo-O-, and Mo=S ligand, and a weak Mo-O(E730) bond at alkaline pH | Rhodobacter capsulatus |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Molybdenum | in the molybdenum cofactor, the metal ion binds a molybdopterin (MPT) molecule via its dithiolene function and terminal sulfur and oxygen groups. Oxidized wild-type and mutant Q179A reveal a similar Mo(VI) ion with each one molybdopterin, Mo=O, Mo-O-, and Mo=S ligand, and a weak Mo-O(E730) bond at alkaline pH | Rhodobacter capsulatus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
xanthine + NAD+ + H2O | Rhodobacter capsulatus | - |
urate + NADH + H+ | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Rhodobacter capsulatus | - |
- |
- |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
xanthine + NAD+ + H2O = urate + NADH + H+ | a reaction mechanism for XDH is suggested in which an initial oxo rather than a hydroxo group and the sulfido ligand are essential for xanthine oxidation | Rhodobacter capsulatus |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
xanthine + NAD+ + H2O | - |
Rhodobacter capsulatus | urate + NADH + H+ | - |
? |
Synonyms | Comment | Organism |
---|---|---|
XDH | - |
Rhodobacter capsulatus |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
molybdenum cofactor | MoCo, the metal ion binds a molybdopterin (MPT) molecule via its dithiolene function and terminal sulfur and oxygen groups | Rhodobacter capsulatus | |
[2Fe-2S]-center | - |
Rhodobacter capsulatus |
General Information | Comment | Organism |
---|---|---|
evolution | the enzyme belongs to the xanthine oxidase family | Rhodobacter capsulatus |
additional information | analysis of the mechanism of transfer of an oxygen atom to the substrate | Rhodobacter capsulatus |