Insect cytochrome P450 monooxygenase and related detoxification enzymes (CYP/GST/COE)

Insect cytochrome P450 monooxygenases (CYPs), along with related detoxification enzymes such as glutathione S-transferases (GSTs) and carboxyl/cholinesterases (CCEs), constitute the primary biochemical defense system in insects against xenobiotics. These enzymes facilitate the phase I and phase II metabolism of a wide array of synthetic insecticides and natural plant toxins, rendering them more polar and easier to excrete (Feyereisen, R., 2012, Insect Molecular Biology and Biochemistry). Beyond detoxification, CYPs are essential for the biosynthesis and degradation of vital insect hormones, including ecdysteroids and juvenile hormones, which regulate growth, development, and reproduction (Scott, J. G., 1999, Insect Biochemistry and Molecular Biology). In medical and agricultural entomology, the over-expression or mutation of these enzymes is a major mechanism of insecticide resistance, significantly impacting the control of disease vectors like Anopheles mosquitoes (Li, X., et al., 2007, Annual Review of Entomology). Pharmacological intervention typically involves the use of synergists, such as piperonyl butoxide, which covalently bind to and inhibit CYP enzymes to prevent the breakdown of co-administered insecticides (Nauen, R., 2007, Pest Management Science). Understanding these enzyme systems is crucial for developing new pest control strategies and managing the spread of vector-borne diseases. These enzymes are also involved in the activation of pro-insecticides, making them dual-purpose targets in chemical design. Their diversity and rapid evolution pose significant challenges for long-term pest management and public health initiatives.

Other names

CYP450Mixed-function oxidaseMFOGlutathione S-transferaseGSTCarboxylesteraseCOEPhase I and II detoxification enzymesHeme-thiolate protein

Inhibition of metabolic detoxification to enhance insecticide potency (synergism) or metabolic activation of pro-insecticides into their toxic forms (Nauen, R., 2007, Pest Management Science).