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An antennal-specific OBP mediates bait odorant perception in fire ants

文献类型： 外文期刊

作者： Liu, Jinlong 1 ; Zhao, Wenzhen 1 ; Hu, Changyuan 1 ; Xia, Yidan 1 ; Li, Lei 2 ; Zhang, Fangping 2 ; Wang, Man-Qun 1 ; Zhou, Aiming 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Integrated Pest Management Trop Crops, Minist Agr & Rural Affairs, Haikou 571101, Peoples R China

关键词： Odorant binding protein; Bait odorants; Odorant receptor neuron signaling

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2025 年 293 卷

页码：

收录情况： SCI

摘要： Odorant binding proteins (OBPs) play a key role in the crosstalk between the external environment and dendritic neuron activation. Ham sausage is an efficient bait widely used for monitoring the invasive ant Solenopsis invicta in the field, whereas the chemoreceptors involved in bait odorant perception in S. invicta have not been functionally characterized. Here, we investigated the role of SiOBP2, an OBP specifically expressed in the antenna, from S. invicta in detecting bait odorants. SiOBP2 was specifically expressed in sensillum basiconca in S. invicta antennae and displayed strong binding affinity and diverse binding mechanisms with specific bait odorants, such as static quenching and multiple binding characteristics with 3-mercapto-2-butanone and furfuryl mercaptan. Knockdown of SiOBP2 abolished the electroantennogram and behavioral responses of S. invicta to these odorants. S. invicta with SiOBP2 knockdown exhibited inactivation of odorant receptor neuron signaling and reduced bait searching efficiency. Foraging behavior and sensory cone responses to bait odorant stimuli in S. invicta demonstrate the sensillum basiconca is particularly tuned to 3-mercapto-2-butanone and furfuryl mercaptan. Collectively, SiOBP2 is essential for the perception of S. invicta on bait odorants and can be used as an important molecular target to develop novel attractants for S. invicta.

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