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Homology Modeling of Cry1Ac Toxin-binding Alkaline Phosphatase Receptor from Helicoverpa armigera and Its Functional Interpretation
Authors:Shan Shiping  Xia Liqiu  Ding Xuezhi  Zhang Youming  Hu Shengbiao  Sun Yunjun  Yu Ziquan  Han Lizhen
Institution:1. Key Laboratory of Microbial Molecular Biology of Hunan Province, College of Life Science, Hunan Normal University, Changsha, Hunan 410081, China;2. College of Life Science, Guizhou University, Guiyang, Guizhou 550025, China
Abstract:Alkaline phosphatases (ALPs) attached to the midgut membrane with glycosyl phosphotidyl inositol (GPI) have been proposed as the putative Cry1Ac toxin receptor in Helicoverpa armigera. Activated toxins bind to ALP receptors on the brush border membrane vesicle (BBMV) of the midgut epithelium, which activates intracellular oncotic pathways and leads to cell death. However, with the long‐term use of Cry toxin, insects can develop a strong resistance to insecticidal delta‐endotoxins. Although the molecular mechanism of insect resistance has not been fully understood, insects develop resistance to biopesticides due to changes of toxins binding to midgut receptors. So, it is a good idea to investigate the molecular mechanism of insect resistance by analyzing ALP receptor from Helicoverpa armigera (Ha‐ALP). Based on crystal structure of shrimp alkaline phosphatase, the three‐dimensional structure of the Cry1Ac toxin‐binding Ha‐ALP receptor was obtained by homology modeling and the model was further evaluated using PROSA energy and ERRAT. The important role of binding of toxin to GalNAc on Ha‐ALP was discussed in the aspect of Cry1Ac toxicity. Specific recognition sites of the binding of oligosaccharides to Ha‐ALP were predicted. Post‐translational modification of ALP provides insights into the functional properties of ALP and leads to profound understanding of receptor and toxin interactions.
Keywords:alkaline phosphatase  receptor  brush border membrane vesicle  GalNAc  oligosacchride
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