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NADPH-cytochrome P450 reductase knockdown decreases the response to precocene I in the migratory locust Locusta migratoria. | LitMetric

AI Article Synopsis

  • Precocene I is a juvenile hormone antagonist that requires activation through oxidative biotransformation facilitated by cytochrome P450 (CYP), with the role of NADPH-cytochrome P450 reductase (CPR) in this process not previously studied.
  • Analysis of the CPR gene in Locusta migratoria (LmCPR) showed key interactions with NADPH, FAD, and FMN, and treatment with precocene I reduced juvenile hormone levels significantly in nymphs, leading to a higher rate of precocious adult development.
  • Knockdown of LmCPR resulted in a reduced response to precocene I, confirming its involvement in the activation process, while a functional recombinant LmCPR protein was successfully created for further

Article Abstract

Precocene I is a juvenile hormone antagonist that needs to be activated via oxidative biotransformation catalyzed by cytochrome P450 (CYP). NADPH-cytochrome P450 reductase (CPR) supplies CYP with electrons in the oxidation-reduction process; however, its functional role in the activation of precocene I remains unexplored. Here, the representative characteristics of CPRs were analyzed in the CPR gene of Locusta migratoria (LmCPR), the result of model docking indicated that the hydrogen bonds were formed between reduced nicotinamide adenine dinucleotide phosphate (NADPH), flavin adenine dinucleotide (FAD), flavin mononucleotide (FMN) and NADPH-, FAD-, FMN-domains of LmCPR, respectively. Treating the fourth-instar nymphs with precocene I decreased the juvenile hormone titers of nymphs to 0.55-fold of that in acetone-treated controls, and extended the interval time between fourth- and fifth-instar nymphs. 68.75% of the treated fourth-instar nymphs developed into precocious adults in the fifth-instar. LmCPR knockdown decreased the response to precocene I in the nymphs, the occurrence rate of precocious adults induced by precocene I treatment reduced by 23.11%. Therefore, LmCPR may be involved in the activation of precocene I in L. migratoria. In addition, we generated an active recombinant LmCPR protein using a prokaryotic expression system, its activity in reducing cytochrome c was 33.13 ± 11.50 nmol CytCred/min/μg protein. This study lays the foundation for further research on the role of LmCPR in precocene I activation.

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Source
http://dx.doi.org/10.1016/j.pestbp.2023.105337DOI Listing

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