Bacterial luciferase operon (luxCDABE) (luxCDABE)

The luxCDABE operon is a genetic cluster primarily found in bioluminescent marine and terrestrial bacteria, such as Aliivibrio fischeri and Photorhabdus luminescens, that enables the production of visible blue-green light. It is a unique system because it encodes both the luciferase enzyme (LuxAB) and the enzymes required to synthesize its aldehyde substrate (LuxCDE), allowing for completely autonomous bioluminescence in host organisms (Winson, M. K., et al., 1998). The light-emitting reaction involves the oxidation of reduced flavin mononucleotide and a long-chain fatty aldehyde, a process that is highly dependent on the metabolic state of the cell. While not a direct therapeutic target for treating human diseases, the operon is an invaluable tool in drug discovery and microbiology, serving as a real-time reporter for monitoring gene expression, bacterial viability, and antibiotic efficacy (Francis, K. P., et al., 2000). In pharmaceutical research, it is frequently used to engineer 'bioluminescent' pathogens, enabling non-invasive imaging of infection progression and the evaluation of antimicrobial treatments in living animal models.

Other names

lux operonBioluminescence gene clusterLuciferase-fatty acid reductase gene clusterluxABCDE operon

The luxCDABE operon encodes the enzymes necessary for bacterial bioluminescence. The luxA and luxB genes encode the alpha and beta subunits of luciferase, which catalyzes the oxidation of reduced flavin mononucleotide (FMNH2) and a long-chain aldehyde (tetradecanal). The luxC, luxD, and luxE genes encode a fatty acid reductase complex (reductase, transferase, and synthetase) that continuously regenerates the aldehyde substrate from fatty acids, allowing for autonomous light emission without the addition of external substrates (Meighen, E. A., 1991; Close, D. M., et al., 2012).