Publication date: July 2016
Source:International Journal of Biological Macromolecules, Volume 88
Author(s): Bhagath Kumar P., Kasi Viswanath K., Tuleshwori Devi S., Sampath Kumar R., Daniel Doucet, Arthur Retnakaran, Peter J. Krell, Qili Feng, Dinakara Rao Ampasala
At the end of each stadium, insects undergo a precisely orchestrated process known as ecdysis which results in the replacement of the old cuticle with a new one. This physiological event is necessary to accommodate growth in arthropods since they have a rigid chitinous exoskeleton. Ecdysis is initiated by the direct action of Ecdysis Triggering Hormones on the central nervous system. Choristoneura fumiferana is a major defoliator of coniferous forests in Eastern North America. It is assumed that, studies on the ecdysis behavior of this pest might lead to the development of novel pest management strategies. Hence in this study, the cDNA of CfETH was cloned. The open reading frame of the cDNA sequence was found to encode three putative peptides viz., Pre-Ecdysis Triggering Hormone (PETH), Ecdysis Triggering Hormone (ETH), and Ecdysis Triggering Hormone Associated Peptide (ETH-AP). The CfETH transcript was detected in the epidermal tissue of larval and pupal stages, but not in eggs and adults. In order to explore the structural conformation of ETH, ab initio modelling and Molecular Dynamics (MD) Simulations were performed. Further, a library of insecticides was generated and virtual screening was performed to identify the compounds displaying high binding capacity to ETH.
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