X-Ray crystallographic evidence for the presence of the cysteine tryptophylquinone cofactor in L-lysine {varepsilon}-oxidase from Marinomonas mediterranea
Okazaki, S., Nakano, S., Matsui, D., Akaji, S., Inagaki, K., Asano, Y.(2013) J Biochem 154: 233-236
- PubMed: 23908359 
- DOI: https://doi.org/10.1093/jb/mvt070
- Primary Citation of Related Structures:  
3WEU, 3WEV - PubMed Abstract: 
We have determined the x-ray crystal structure of L-lysine ε-oxidase from Marinomonas mediterranea in its native and L-lysine-complex forms at 1.94- and 1.99-Å resolution, respectively. In the native enzyme, electron densities clearly indicate the presence of cysteine tryptophylquinone (CTQ) previously identified in quinohemoprotein amine dehydrogenase. In the L-lysine-complex, an electron density corresponding to the bound L-lysine shows that its ε-amino group is attached to the C6 carbonyl group of CTQ, suggesting the formation of a Schiff-base intermediate. Collectively, the present crystal structure provides the first example of an enzyme employing a tryptophylquinone cofactor in an amine oxidase.
Organizational Affiliation: 
Biotechnology Research Center and Department of Biotechnology, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan.