Abstract
Chemosensory proteins (CSPs) have been proposed to capture and transport hydrophobic chemicals to receptors on sensory neurons. We identified and cloned 24 CSP genes to better understand the physiological function of CSPs in Helicoverpa armigera. Quantitative real-time polymerase chain reaction assays indicate that CSP genes are ubiquitously expressed in adult H. armigera tissues. Broad expression patterns in adult tissues suggest that CSPs are involved in a diverse range of cellular processes, including chemosensation as well as other functions not related to chemosensation. The H. armigera CSPs that were highly transcribed in sensory organs or pheromone glands (HarmCSPs 6, 9, 18, 19), were recombinantly expressed in bacteria to explore their function. Fluorescent competitive binding assays were used to measure the binding affinities of these CSPs against 85 plant volatiles and 4 pheromone components. HarmCSP6 displays high binding affinity for pheromone components, whereas the other three proteins do not show affinities for any of the compounds tested. HarmCSP6 is expressed in numerous cells located in or close to long sensilla trichodea on the antennae of both males and females. These results suggest that HarmCSP6 may be involved in transporting female sex pheromones in H. armigera.
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Abbreviations
- CSP:
-
Chemosensory protein
- OBP:
-
odorant-binding protein
- OS-D:
-
olfactory specific protein-D
- qRT-PCR:
-
quantitative real-time polymerase chain reaction
- Nr:
-
Non-redundant protein sequences database
- 1-NPN:
-
1-N-phenylnaphthylamine
- Ki:
-
Dissociation constant
- PBP:
-
Pheromone binding protein
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Acknowledgment
We thank Nai-Yong Liu (Nanjing Agricultural University, China) for help in 3-D structural modeling, and professer Guirong Wang and Mengbo Guo for help in the in situ hybridization experiments. This study was funded by research grants from the Ministry of Agriculture of China (2014ZX08011-002) and the National Natural Science Foundation of China (31071978).
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Li, ZQ., Zhang, S., Luo, JY. et al. Expression Analysis and Binding Assays in the Chemosensory Protein Gene Family Indicate Multiple Roles in Helicoverpa armigera . J Chem Ecol 41, 473–485 (2015). https://doi.org/10.1007/s10886-015-0574-x
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DOI: https://doi.org/10.1007/s10886-015-0574-x