A modelling study of a non-concerted hydrolytic cycloaddition reaction by the catalytic antibody H11

Clark, R.L. and Johnston, B.F. and Suckling, C.J. and Mackay, S.P. (2006) A modelling study of a non-concerted hydrolytic cycloaddition reaction by the catalytic antibody H11. Bioorganic and Medicinal Chemistry Letters, 14. pp. 2674-2683. ISSN 0960-894X

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Abstract

H11 is the first antibody reported to have dual activity as a non-concerted, Diels-Alderase and hydrolytic catalyst. It was previously shown to catalyse the cycloaddition of acetoxybutadiene 1a to N-alkyl maleimides 2 to afford hydroxy-substituted bicyclic adducts 3 with a 30% ee of a major isomer. To better understand this mechanism and the partial stereospecificity, a homology model of H11 was constructed and used in docking studies to evaluate potential antibody-ligand complexes. The model suggested the hydrolytic nature of H11 was due to Glu 95H acting as a catalytic base, and evaluation of the shape complementarity of the proposed antibody-ligand complexes confirmed at a semi-quantitative level the observation that the major enantiomer is produced in a 30% ee.