›› 2018, Vol. 61 ›› Issue (6): 657-667.doi: 10.16380/j.kcxb.2018.06.004

• 研究论文 • 上一篇    下一篇


孙佳斌1, 刘乃勇2, 李双美1, 闫祺1, 董双林1,*   

  1. (1. 南京农业大学植物保护学院, 农业部作物病虫害监测与防控重点开放实验室, 南京 210095;  2. 西南林业大学, 云南省森林灾害预警与控制重点实验室, 昆明 650224)
  • 出版日期:2018-06-20 发布日期:2018-06-20

Molecular cloning, tissue expression profiling and binding characterization of the pheromone binding protein SlitPBP4 from Spodoptera litura (Lepidoptera: Noctuidae)

SUN Jia-Bin1, LIU Nai-Yong2, LI Shuang-Mei1, YAN Qi1, DONG Shuang-Lin1,*    

  1.  (1. Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; 2. Key Laboratory of Forest Disaster Warning and Control of Yunnan Province, Southwest Forestry University, Kunming 650224, China)
  • Online:2018-06-20 Published:2018-06-20

摘要: 【目的】鉴定斜纹夜蛾Spodoptera litura新的信息素结合蛋白(pheromone binding protein, PBP)基因,明确其在斜纹夜蛾不同组织中的表达水平并探讨其功能。【方法】基于已报道的烟草天蛾 Manduca sexta、家蚕Bombyx mori、君主斑蝶Danaus plexippus和庆网蛱蝶Melitaea cinxia 4种非夜蛾科昆虫PBP4同源基因的序列特点及与其他PBP基因在染色体上的相邻关系,通过分析实验室先前克隆到的斜纹夜蛾PBP/GOBP基因序列,克隆斜纹夜蛾PBP4同源基因;通过RT-PCR和qPCR技术测定该基因在斜纹夜蛾雌雄成虫不同组织中的表达水平;利用体外表达和荧光竞争性结合实验测定斜纹夜蛾PBP4蛋白对性信息素组分和植物气味物质的结合能力。【结果】在夜蛾科昆虫斜纹夜蛾中鉴定到首个PBP4基因,命名为SlitPBP4(GenBank登录号: MG356847),cDNA编码210个氨基酸,具有N末端信号肽、疏水性气味分子结合域及6个保守半胱氨酸等PBP的典型序列特征,其基因组DNA在保守位置也含有2个内含子;但和已报道的斜纹夜蛾3个PBP相比,PBP4的C末端明显较长。SlitPBP4在雄成虫腹部(生殖系统)极高表达,在雌雄成虫触角及其他组织中仅微弱表达或不表达。荧光竞争性结合实验结果表明,SlitPBP4蛋白与被测定的信息素组分及植物气味物质均没有明显结合能力。【结论】报道了夜蛾科昆虫的首个PBP4基因,该基因可能主要参与雄虫生殖相关的生理过程而非嗅觉功能。

关键词: 斜纹夜蛾, SlitPBP4, 组织表达分析, 原核表达, 荧光竞争结合实验

Abstract:  【Aim】 This study aims to identify the new pheromone binding protein (PBP) gene of Spodoptera litura, to clarify its tissue expression pattern and to explore its functions. 【Methods】 Based on the sequence characteristics of PBP4 homologues and their vicinity with other PBP genes on the chromosome in four non-noctuid species (Manduca sexta, Bombyx mori, Danausplexippus and Melitaea cinxia) reported previously, a PBP4 gene was obtained from S. litura by analyzing S. litura PBP/GOBP genes previously cloned by our laboratory. The tissue expression patterns of this gene in male and female adults were determined by RT-PCR and qPCR. The binding properties of the recombinant PBP4 protein to sex pheromone components and plant odorants were measured by fluorescence competitive binding assay. 【Results】 The first PBP4 gene in Noctuidae was identified from S. litura and named SlitPBP4, which was deposited in GenBank under accession number MG356847. The cDNA sequence of SlitPBP4 encodes 210 amino acids, with the typical sequence features of PBPs, including an N terminal signal peptide, several hydrophobic regions, six conserved cysteines, and two introns inserted at the conserved positions in the genomic DNA. However, SlitPBP4 has a C terminus much longer than that of the other three reported SlitPBPs. SlitPBP4 showed predominantly high expression level in the male abdomen (the reproductive systems) but nearly undetectable in the antennae and other adult tissues. Fluorescence competitive binding assay showed that SlitPBP4 protein had no obvious binding ability to the tested pheromone components and plant odors. 【Conclusion】 The first PBP4 gene of noctuids was reported. SlitPBP4 is likely to be involved primarily in the reproduction-related physiological processes in male adults, rather than the olfactory function of other reported PBP genes in noctuids.

Key words: Spodoptera litura, SlitPBP4, tissue expression, prokaryotic expression, fluorescence competitive binding assay