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. The dimerization interface observed in the available 3D structure does not seem to be conserved. Homologs of LodA have been detected in various gram-negative bacteria, and they appear to be associated with the formation of biofilms.
Jiyao W et al.(2023). "The conserved domain database in 2023.",