Bacterial luciferase system (luxCDABE) (luxCDABE)

The luxCDABE system is a genetic operon derived from bioluminescent bacteria, such as Aliivibrio fischeri and Photorhabdus luminescens, that enables autonomous light production (Meighen, 1991, PMID: 2067440). It comprises five essential genes: luxA and luxB, which encode the alpha and beta subunits of the luciferase enzyme, and luxC, luxD, and luxE, which encode the fatty acid reductase complex required to generate the long-chain aldehyde substrate (Close et al., 2012, PMID: 22368477). The luciferase enzyme catalyzes the oxidation of reduced flavin mononucleotide (FMNH2) and a long-chain aliphatic aldehyde in the presence of molecular oxygen, resulting in the emission of blue-green light at approximately 490 nm (Winson et al., 1998, PMID: 9729251). While not a traditional therapeutic target for human disease, the luxCDABE system is extensively utilized as a real-time, non-invasive reporter in drug discovery, environmental toxicology, and the study of bacterial pathogenesis (Francis et al., 2001, PMID: 11237011). It allows researchers to monitor bacterial growth, metabolic activity, and gene expression in both in vitro and in vivo models without the need for exogenous substrate addition, making it a vital tool for evaluating antibiotic efficacy and pathogen colonization (Andreu et al., 2011, PMID: 21402803).

Other names

lux operonBacterial bioluminescence pathwayAlkanal monooxygenase (FMN-linked) systemLuxAB luciferaseFatty acid reductase complex

Not applicable as this is a reporter system, not a therapeutic target. The biochemical mechanism involves the luciferase-catalyzed oxidation of FMNH2 and a long-chain aldehyde into FMN and a fatty acid, releasing light (Meighen, 1991, PMID: 2067440).