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Microorganisms 2019, 7(1), 1; https://doi.org/10.3390/microorganisms7010001

Characterised Flavin-Dependent Two-Component Monooxygenases from the CAM Plasmid of Pseudomonas putida ATCC 17453 (NCIMB 10007): ketolactonases by Another Name

1
College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QG, UK
2
Curnow Consultancies, Helston TR13 9PQ, UK
Received: 26 November 2018 / Revised: 15 December 2018 / Accepted: 16 December 2018 / Published: 20 December 2018
(This article belongs to the Section Microbial Biotechnology)
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Abstract

The CAM plasmid-coded isoenzymic diketocamphane monooxygenases induced in Pseudomonas putida ATCC 17453 (NCIMB 10007) by growth of the bacterium on the bicyclic monoterpene (rac)-camphor are notable both for their interesting history, and their strategic importance in chemoenzymatic syntheses. Originally named ‘ketolactonase—an enzyme system for cyclic lactonization’ because of its characterised mode of action, (+)-camphor-induced 2,5-diketocamphane 1,2-monooxygenase was the first example of a Baeyer-Villiger monooxygenase activity to be confirmed in vitro. Both this enzyme and the enantiocomplementary (−)-camphor-induced 3,6-diketocamphane 1,6-monooxygenase were mistakenly classified and studied as coenzyme-containing flavoproteins for nearly 40 years before being correctly recognised and reinvestigated as FMN-dependent two-component monooxygenases. As has subsequently become evident, both the nature and number of flavin reductases able to supply the requisite reduced flavin co-substrate for the monooxygenases changes progressively throughout the different phases of camphor-dependent growth. Highly purified preparations of the enantiocomplementary monooxygenases have been exploited successfully for undertaking both nucleophilic and electrophilic biooxidations generating various enantiopure lactones and sulfoxides of value as chiral synthons and auxiliaries, respectively. In this review the chequered history, current functional understanding, and scope and value as biocatalysts of the diketocamphane monooxygenases are discussed. View Full-Text
Keywords: ketolactonase; diketocamphane monooxygenase; flavin-dependent two-component monooxygenase; enantiocomplementary enzymes; enantiodivergent biotransformation ketolactonase; diketocamphane monooxygenase; flavin-dependent two-component monooxygenase; enantiocomplementary enzymes; enantiodivergent biotransformation
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Willetts, A. Characterised Flavin-Dependent Two-Component Monooxygenases from the CAM Plasmid of Pseudomonas putida ATCC 17453 (NCIMB 10007): ketolactonases by Another Name. Microorganisms 2019, 7, 1.

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