L-lysine epsilon-oxidase from Marinomonas mediterranea and similar proteins
L-lysine epsilon-oxidase is responsible for oxidative deamination of L-lysine, producing L-2-aminoadipate-6-semialdehyde. Hydrogen peroxide is a side-product of this enzymatic reaction, which requires the cofactor CTQ (cysteine tryptophylquinone). CTQ most likely forms a Schiff base with the free amino acid substrate. The protein is also called marinocine, for its broad-spectrum antibacterial activity; the latter is most likely caused by hydrogen peroxide synthesis. Homologs of LodA have been detected in various gram-negative bacteria, and they appear to be associated with the formation of biofilms.
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