title: Stereoselectivity behavior of the AZ28 antibody catalyzed oxy-Cope rearrangement.
abstract: Catalytic antibodies are very interesting not only because of the rate enhancement of the reactions that they catalyze but also because of the selectivities they can achieve that are sometimes not present in natural enzyme processes. We have selected the study of the stereoselectivity of the matured AZ28 that catalyzes an oxy-Cope rearrangement. For this particular case, the presence of a chiral center in the substrate provokes the existence of two different enantiomers, R and S. Furthermore, it is also possible to locate two different orientations for the hydroxyl group in the central ring of the substrate in the transition state, equatorial and axial, rendering two different conformers. In this paper we present the free energy profiles obtained for different substrate isomers in the cavity created by the matured catalytic antibody. Our simulations have reproduced the stereoselectivity of the matured AZ28, differentiating between the axial or equatorial orientations and preferentially stabilizing the S forms, at a qualitative level. Finally, the inclusion of the substrate-CA interactions in a flexible molecular model has allowed us to observe the different pattern of interactions that are related to different interaction energies, which seem to be crucial in the stereoselectivity behavior of the catalytic antibody.
authors.affiliation: Departament de Ciències Experimentals, Universitat Jaume I, Box 224, Castellón Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: Martí
authors.forename: Juan
authors.initials: J
authors.lastname: Andrés
authors.forename: Vicent
authors.initials: V
authors.lastname: Moliner
authors.forename: Estanislao
authors.initials: E
authors.lastname: Silla
authors.forename: Iñaki
authors.initials: I
authors.lastname: Tuñón
authors.forename: Juan
authors.initials: J
authors.lastname: Bertrán
mesh_terms: D017151:Antibodies, Catalytic / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D002384:Catalysis; D003198:Computer Simulation; D008958:Models, Molecular; D013237:Stereoisomerism; D013379:Substrate Specificity
chemical_list: D017151:Antibodies, Catalytic