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Zhou, Yanan; Huang, Cong; Fu, Guanjun; Tang, Rui; Yang, Nianwan; Liu, Wanxue; Qian, Wanqiang; Wan, Fanghao
International journal of molecular sciences, 2024-Feb-01, 2024-02-01, 20240201, Letnik: 25, Številka: 3Journal Article
General odorant-binding proteins (GOBPs) play a crucial role in the detection of host plant volatiles and pheromones by lepidopterans. Previous studies identified two duplications in the gene in . In this study, we employed qRT-PCR, protein purification, and fluorescence competitive binding assays to investigate the functions of three genes in . Our findings reveal that and are specifically highly expressed in antennae, while exhibits high specific expression in wings, suggesting a potential divergence in their functions. Recombinant proteins of CpomGOBP2a, CpomGOBP2b, and CpomGOBP2c were successfully expressed and purified, enabling an in-depth exploration of their functions. Competitive binding assays with 20 host plant volatiles and the sex pheromone (codlemone) demonstrated that CpomGOBP2a exhibits strong binding to four compounds, namely butyl octanoate, ethyl ( , )-deca-2,4-dienoate (pear ester), codlemone, and geranylacetone, with corresponding dissolution constants (Ki) of 8.59993 μM, 9.14704 μM, 22.66298 μM, and 22.86923 μM, respectively. CpomGOBP2b showed specific binding to pear ester (Ki = 17.37481 μM), while CpomGOBP2c did not exhibit binding to any tested compounds. In conclusion, our results indicate a functional divergence among , , and . These findings contribute valuable insights for the development of novel prevention and control technologies and enhance our understanding of the evolutionary mechanisms of olfactory genes in .
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