Molecular characterization of cytochrome P450 CYP6B47 cDNAs and 5鈥?flanking sequence from Spodoptera litura (Lepidoptera: Noctuidae): Its response to lead stress

详细信息	查看全文 | 推荐本文 |

• 作者：Jialiang Zhou ; Guren Zhang ; Qiang Zhou ; ^{lsszhou@mail.sysu.edu.cn}
• 关键词：Cytochrome P450 ; 5&prime ; -Flanking sequence ; Lead (Pb) ; Developmental expression
• 刊名：Journal of Insect Physiology
• 出版年：2012
• 期刊代码：92_00221910
• 类别：bio
• 出版时间：May, 2012
• 卷：58
• 期：5
• 页码：726-736
• 文件大小：1623 K

摘要

In insects, P450s are responsible for the oxidative metabolism of structurally diverse endogenous and exogenous compounds including plant allelochemicals and insecticides. A novel full-length P450 cDNA, CYP6B47, was cloned from Spodoptera litura (Lepidoptera: Noctuidae). The sequence is 1718 bp in length with an ORF of 1509 bp encoding 503 amino acid residues. The phylogenetic analysis indicated that CYP6B47 belongs to CYP3 clan and second clade of CYP6Bs which contain 11 P450s from Noctuidae. Quantitative real-time PCR showed that CYP6B47 was expressed only in larvae stages and had a high level of transcription in the midgut and fat body. In addition, we cloned a 2141-bp 5鈥?flanking regions and presented the basal luciferase activities of promoter. We also predicted multiple putative elements for transcription factors binding in the 5鈥?flanking region. Interestingly, the expression of CYP6B47 significantly increased in the midgut and fat body after lead (Pb) exposure for 5 generations. Larvae tolerance to the alpha-cypermethrin (35%increased in LC₅₀) and fenvalerate (52%increased in LC₅₀) were improved after pre-exposure to 50 mg/kg Pb. These dates suggested that lead increased tolerance of larvae to insecticides mainly through transcriptional induction of detoxification genes including CYP6B47.