D-amino acid dehydrogenase (quinone) (, DadA) is an enzyme with systematic name D-amino acid:quinone oxidoreductase (deaminating). This enzyme catalyses the following chemical reaction
D-amino acid + H2O + quinone 2-oxo carboxylate + NH3 + quinol
For example, the bacterium Escherichia coli B acts on D-phenylalanine:
This enzyme is iron-sulfur flavoprotein.
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