Tissue expression profiling and ligandbinding properties of <em>HarmOBP</em>16 of the cotton bollworm, <em>Helicoverpa armigera</em> (Lepidoptera: Noctuidae)
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ACTA ENTOMOLOGICA SINICA  2017, Vol. 60 Issue (8): 891-899    DOI: 10.16380/j.kcxb.2017.08.005
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Tissue expression profiling and ligandbinding properties of HarmOBP16 of the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)
LI Zhao-Qun1,2, ZHANG Shuai1, ZHOU Shu-Fen3, LUO Jun-Yu1, CUI Jin-Jie1,*
 (1. Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, Henan 455000, China; 2. Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; 3. Agricultural Bureau of Yanzhou District, Jining, Shandong 272100, China)
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Abstract 【Aim】 This study aims to reveal the tissue expression patterns of the odorant binding protein (OBP) gene HarmOBP16 in the cotton bollworm, Helicoverpa armigera, and the binding properties of its recombinant protein with plant volatiles. 【Methods】 According to the antenna transcriptome data, the OBP gene was cloned from the antennae of H. armigera adults and subjected to bioinformatical and phylogenetic analysis. The tissue expression patterns of the gene in adult head (without antennae and probosis), thorax, abdomen, legs, wings, antennae and proboscis were assayed by qPCR. The recombinant protein was expressed and purified with prokaryotic expression system. The binding characteristics of this recombinant protein to 85 candidate plant volatiles were measured by fluorescence competitive binding assay. 【Results】 An atypical OBP gene, HarmOBP16 (GenBank accession no.: JQ753074), was identified and cloned from the antennae of H. armigera adults by PCR. It contains a 441 bp open reading frame (ORF) encoding a protein of 146 amino acids with 10 conserved cysteine residues and the isoelectric point value of 6.87. The tissue expression patterns showed that HarmOBP16 was highly expressed in wings of the female adults. The competitive fluorescence binding assay of the expressed and purified recombinant HarmOBP16 showed that HarmOBP16 exhibited higher binding affinities to geranylacetone (Ki=14.2 μmol/L), β-ionone (Ki=15.2 μmol/L), octyl aldehyde (Ki=15.3 μmol/L), (+/-)-linalool (Ki=16.8 μmol/L), (R)-(+)-limonene (Ki=14.9 μmol/L), and (+)-β-pinene (Ki=17.3 μmol/L). 【Conclusion】 The results suggest that HarmOBP16 may play a role in the host seeking of H. armigera, which may provide a potential molecular target for the development of attractants or repellents in H. armigera.
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LI Zhao-Qun
ZHANG Shuai
ZHOU Shu-Fen
LUO Jun-Yu
CUI Jin-Jie
Key wordsHelicoverpa armigera; odorant binding protein   tissue expression patterns   in vitro expression   competitive fluorescence binding assay     
Cite this article:   
LI Zhao-Qun,ZHANG Shuai,ZHOU Shu-Fen et al. Tissue expression profiling and ligandbinding properties of HarmOBP16 of the cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)[J]. ACTA ENTOMOLOGICA SINICA, 2017, 60(8): 891-899.
URL:  
http://www.insect.org.cn/EN/10.16380/j.kcxb.2017.08.005      or     http://www.insect.org.cn/EN/Y2017/V60/I8/891
 
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