Conserved chemosensory proteins in the proboscis and eyes of Lepidoptera
文献类型: 外文期刊
第一作者: Liu, Yang
作者: Liu, Yang;Pelosi, Paolo;Wang, Guirong;Iovinella, Immacolata;Liu, Yu-Ling;Huang, Ling-Qiao;Wang, Chen-Zhu;Iovinella, Immacolata;Dani, Francesca Romana
作者机构:
关键词: Odorant-binding protein;Chemosensory protein;Proboscis;Lepidoptera;Proteomics;Vision
期刊名称:INTERNATIONAL JOURNAL OF BIOLOGICAL SCIENCES ( 影响因子:6.58; 五年影响因子:6.478 )
ISSN: 1449-2288
年卷期: 2016 年 12 卷 11 期
页码:
收录情况: SCI
摘要: Odorant-binding proteins (OBPs) and chemosensory proteins (CSPs) are endowed with several different functions besides being carriers for pheromones and odorants. Based on a previous report of a CSP acting as surfactant in the proboscis of the moth Helicoverpa armigera, we revealed the presence of orthologue proteins in two other moths Plutella xylostella and Chilo suppressalis, as well as two butterflies Papilio machaon and Pieris rapae, using immunodetection and proteomic analysis. The unusual conservation of these proteins across large phylogenetic distances indicated a common specific function for these CSPs. This fact prompted us to search for other functions of these proteins and discovered that CSPs are abundantly expressed in the eyes of H. armigera and possibly involved as carriers for carotenoids and visual pigments. This hypothesis is supported by ligand-binding experiments and docking simulations with retinol and beta-carotene. This last orange pigment, occurring in many fruits and vegetables, is an antioxidant and the precursor of visual pigments. We propose that structurally related CSPs solubilise nutritionally important carotenoids in the proboscis, while they act as carriers of both beta-carotene and its derived products 3-hydroxyretinol and 3-hydroxyretinal in the eye. The use of soluble olfactory proteins, such as CSPs, as carriers for visual pigments in insects, here reported for the first time, parallels the function of retinol-binding protein in vertebrates, a lipocalin structurally related to vertebrate odorant-binding proteins.
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