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Front Physiol

Title:		Functional Analysis of the Chemosensory Protein MsepCSP8 From the Oriental Armyworm Mythimna separata
Author(s):		Younas A; Waris MI; Tahir Ul Qamar M; Shaaban M; Prager SM; Wang MQ;
Address:		"College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China. College of Informatics, Huazhong Agricultural University, Wuhan, China. College of Resources and Environment, Huazhong Agricultural University, Wuhan, China. Department of Plant Sciences, University of Saskatchewan, Saskatoon, SK, Canada"
Journal Title:		Front Physiol
Year:		2018
Volume:		20180712
Issue:
Page Number:		872 -
DOI:		10.3389/fphys.2018.00872
ISSN/ISBN:		1664-042X (Print) 1664-042X (Electronic) 1664-042X (Linking)
Abstract:		"Chemosensory proteins (CSPs) play important roles in chemosensation in insects, but their exact physiological functions remain elusive. In order to investigate the functions of CSPs in the oriental armyworm Mythimna separata, in the present study we explored expression patterns and binding characteristics of the CSP, MsepCSP8. The distinctive functions of MsepCSP8 were also validated by RNAi. The results showed that MsepCSP8 shares high sequence similarity with CSPs of other insect family members, including the characteristic four-cysteine signature motif. MsepCSP8 mRNA was specifically expressed in antennae of females at levels well above those in other tissues. Competitive binding assays confirmed that 20 out of 56 ligands bound more strongly to MsepCSP8 at pH 7.4 than at pH 5.0. Protein structure modeling and molecular docking analyses identified amino acid residues involved in binding volatile compounds, and behavioral response experiments showed that M. separata elicited significant responses to five volatiles from compounds displaying high binding affinity to MsepCSP8. MsepCSP8 transcript abundance was decreased by dsMsepCSP8 injection, which affected the behavioral responses of M. separata to representative semiochemicals. Our findings demonstrate that MsepCSP8 likely contributes to mediating responses of M. separata adults to plant volatiles"
Keywords:		RNAi behavioral response chemosensory protein fluorescence competitive binding assay molecular docking;
Notes:		"PubMed-not-MEDLINEYounas, Aneela Waris, Muhammad I Tahir Ul Qamar, Muhammad Shaaban, Muhammad Prager, Sean M Wang, Man-Qun eng Switzerland 2018/07/28 Front Physiol. 2018 Jul 12; 9:872. doi: 10.3389/fphys.2018.00872. eCollection 2018"