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J Exp Biol

Title:		Unique function of a chemosensory protein in the proboscis of two Helicoverpa species
Author(s):		Liu YL; Guo H; Huang LQ; Pelosi P; Wang CZ;
Address:		"State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China ppelosi@agr.unipi.it czwang@ioz.ac.cn"
Journal Title:		J Exp Biol
Year:		2014
Volume:		20140313
Issue:		Pt 10
Page Number:		1821 - 1826
DOI:		10.1242/jeb.102020
ISSN/ISBN:		1477-9145 (Electronic) 0022-0949 (Linking)
Abstract:		"Chemosensory proteins (CSPs) are soluble proteins found only in arthropods. Some of them fill the lumen of chemosensilla and are believed to play a role similar to that of odorant-binding proteins in the detection of semiochemicals. Other members of the CSP family have been reported to perform different functions, from delivery of pheromones to development. This report is focused on a member (CSP4) of the family that is highly and almost exclusively present in the proboscis of two sibling noctuid species, Helicoverpa armigera and H. assulta. We expressed the protein in bacteria and measured binding to terpenoids and related compounds. Using specific antibodies, we found that when the moths suck on a sugar solution, CSP4 is partly extruded from the proboscis. A solution of protein can also fill a hydrophobic tube of same length and diameter as the proboscis by capillary action. On this basis, we suggest that CSP4 acts as a wetting agent to reduce the surface tension of aqueous solutions and consequently the pressure involved in sucking"
Keywords:		"Animals Carbohydrate Metabolism Female Insect Proteins/analysis/*metabolism Male Models, Molecular Moths/chemistry/*metabolism Pheromones/*metabolism Protein Binding Receptors, Odorant/analysis/*metabolism Species Specificity Surface-Active Agents/analysi;"
Notes:		"MedlineLiu, Yu-Ling Guo, Hao Huang, Ling-Qiao Pelosi, Paolo Wang, Chen-Zhu eng Research Support, Non-U.S. Gov't England 2014/03/15 J Exp Biol. 2014 May 15; 217(Pt 10):1821-6. doi: 10.1242/jeb.102020. Epub 2014 Mar 13"