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OSU chemist developing solution to nerve agent exposure
Date:5/3/2011

residue is left behind in the AChE active site. Relatively unstudied in nerve agents, this process, called dealkylation, makes the nerve agent/AChE molecule unreceptive to oximes an unfortunate situation, considering that certain nerve agents (e.g., soman) can undergo aging within minutes of exposure to AChE.

Hadad's study is focused on the identification of compounds that would return an appropriate alkyl group to the aged nerve agent/AChE molecule, thus allowing treatment with oximes to provide for complete recovery. The project is investigating common OP nerve agents Tabun, VX, VR, Sarin, Soman, Cyclosarin and Paraoxon, all of which take on a similar molecular structure upon aging.

"Computational studies of the interaction of the alkylating compounds with AChE were used to provide insight for the design of selective reagents," Hadad explained. "Ligand-receptor docking, followed by molecular dynamics simulations of the interactions of alkylating compounds with aged OP-AChE, was carried out in conjunction with experimental studies to investigate the binding of alkylating compounds to AChE. These results were then used to suggest interactions that aided in the orientation of alkylating compounds for maximal efficacy."

Throughout the project, Hadad employed computational studies to guide the progress of each objective, as well as to rationalize the observed experimental results.

"Dr. Hadad's work on this project has made use of a range of the tools of electronic structure theory, molecular docking, molecular dynamics and hybrid quantum mechanical/molecular mechanical methods," said Ashok Krishnamurthy, interim co-executive director of OSC. "It was by design that OSC's flagship system, the Glenn IBM 1350 Opteron cluster, was developed to meet the needs of the bioscience research investigators, such as Dr. Hadad."


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Contact: Jamie Abel
jabel@osc.edu
614-292-6495
Ohio Supercomputer Center
Source:Eurekalert  

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