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• W2114626677 abstract "We evaluated by the semiempirical method PM3 possible mechanisms of a putative interaction between a cereal allelochemical, the cyclic hydroxamic acid 2,4-dihydroxy-7-metoxy-2H-1,4-benzoxazin-3(4H)-one (DIMBOA), and the tripeptide glutathione (GSH) inside the active site of a theta-class glutathione S-transferase. Based on a preliminary study of transition states from DIMBOA reactions with methanethiolate as a simple model of GSH, we investigated the roles of catalytic residues of the enzyme during nucleophilic additions of GSH to the carbonyl groups of DIMBOA and of its phenol/aldehyde isomer inside the active site model. Our results suggest that a tyrosine residue, Tyr113, makes the most important contributions for the catalytic mechanism. In the modeled reaction steps, Tyr113 behaves as a double hydrogen bond donor catalyst for nucleophilic additions of GSH to substrates: It initially helps stabilize the strongly nucleophilic reduced GSH with a hydrogen bond intermediated by a water molecule; during substrate approach, small conformational changes enable the residue to make a direct hydrogen bond to the substrate group that develop negative charge after addition of reduced GSH. © 2002 Wiley Periodicals, Inc.; Int J Quantum Chem, 2002" @default.
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• W2114626677 date "2002-01-01" @default.
• W2114626677 modified "2023-10-16" @default.
• W2114626677 title "Semiempirical simulation of a theta-class glutathione S-transferase-catalyzed glutathione attack to the allelochemical DIMBOA" @default.
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• W2114626677 doi "https://doi.org/10.1002/qua.10133" @default.
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