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Journal of Integrative Agriculture  2022, Vol. 21 Issue (3): 781-796    DOI: 10.1016/S2095-3119(20)63494-3
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Molecular and in vitro biochemical assessment of chemosensory protein 10 from the brown planthopper Nilaparvata lugens at acidic pH
Muhammad Irfan WARIS1, Aneela YOUNAS1, Rana Muhammad Kaleem ULLAH1, Fatima RASOOL2, Muhammad Muzammal ADEEL3, WANG Man-qun
1 College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R.China
2 National Center for Bioinformatics, Quaid-i-Azam University, Islamaba 45320, Pakistan 
3 College of Informatics, Huazhong Agricultural University, Wuhan 430070, P.R.China
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Chemosensory proteins (CSPs) are important molecular components of the insect olfactory system, which are involved in capturing, binding, and transporting hydrophobic odour molecules across the sensillum in sensillar lymph in regulating insect behavior.  This protein family (CSPs) is also involved in many other systems that are not linked to olfactory receptors in olfactory sensilla.  The brown planthopper (BPH) is a monophagous pest of rice that causes damage by sucking phloem sap and transmitting a number of diseases caused by viruses.  In this study, fluorescence competitive binding assay and fluorescence quenching assay at acidic pH were performed as well as homology modelling to describe the binding affinity of NlugCSP10.  Fluorescence competitive binding assay (FCBA) demonstrated that NlugCSP10 bound strongly to nonadecane, farnesene, and 2-tridecanone at acidic pH.  The results of FCBA indicated that NlugCSP10 bound different ligands at the physiological pH (5.0) of the bulk sensillum lymph.  Fluorescence quenching assay demonstrated that NlugCSP10 generated a stable complex with 2-tridecanone, while two ligands nonadecane and farnesene collided due to molecular collisions.  The interaction of selected ligands with the modelled structure of NlugCSP10 was also analyzed, which found the key amino acids (Gln23, Gln24, Gln25, Asn27, Met33, Ser34, Ile35, Tyr36, Asn42, Met43, Val45, Asn46, Asn93, Arg96, Ala97, Lys99, and Ala100) in NlugCSP10 that were involved in binding of volatile compounds.  The present study contributes to the binding profile of NlugCSP10 that promotes the development of behaviorally active ligands based on BPH olfactory system.
Keywords:  insect olfaction        chemosensory protein        Nilaparvata lugens        fluorescence competitive binding assay        fluorescence quenching assay        molecular docking  
Received: 05 July 2020   Accepted: 03 November 2020
Fund: This study was supported and funded by the National Key Research and Development Program of China (2017YFE0113900) and the Special Technical Innovation of Hubei Province, China (2017ABA146).
About author:  Correspondence WANG Man-qun, E-mail:

Cite this article: 

Muhammad Irfan WARIS, Aneela YOUNAS, Rana Muhammad Kaleem ULLAH, Fatima RASOOL, Muhammad Muzammal ADEEL, WANG Man-qun. 2022. Molecular and in vitro biochemical assessment of chemosensory protein 10 from the brown planthopper Nilaparvata lugens at acidic pH. Journal of Integrative Agriculture, 21(3): 781-796.

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