Abstract
Marinomonas mediterranea is a marine gamma-proteobacterium that synthesizes LodA, a novel l-lysine-ε-oxidase (E.C. 1.4.3.20). This enzyme oxidizes L-lysine generating 2-aminoadipate 6-semialdehyde, ammonium, and hydrogen peroxide. Unlike other l-amino acid oxidases, LodA is not a flavoprotein but contains a quinone cofactor. LodA is encoded by an operon with two genes, lodA and lodB. In the native system, LodB is required for the synthesis of a functional LodA. In this study, we report the recombinant expression of LodA in Escherichia coli using vectors that allow its expression and accumulation in the cytoplasm. To reveal the l-lysine-ε-oxidase activity using the Amplex Red method for hydrogen peroxide detection, it is necessary to first remove the E. coli cytoplasmic catalases. The flavoprotein LodB is the only M. mediterranea protein required in the recombinant system for the generation of the cofactor of LodA. In the absence of LodB, LodA does not contain the quinone cofactor and remains in an inactive form. The results presented indicate that LodB participates in the posttranslational modification of LodA that generates the quinone cofactor.
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Acknowledgments
This work has been supported by grants BIO2010-15226 (Ministerio de Ciencia e Innovación, Spain) and 11867/PI/09 (Fundación Séneca, CARM, Spain) (co-financed by the European Commission, FEDER funds).
We thank Alejandro Torrecillas and the Molecular Biology Service of the University of Murcia for their support on MS analysis.
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Chacón-Verdú, M.D., Gómez, D., Solano, F. et al. LodB is required for the recombinant synthesis of the quinoprotein l-lysine-ε-oxidase from Marinomonas mediterranea . Appl Microbiol Biotechnol 98, 2981–2989 (2014). https://doi.org/10.1007/s00253-013-5168-3
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DOI: https://doi.org/10.1007/s00253-013-5168-3