Catalysis of decarboxylation by a preorganized heterogeneous microenvironment: crystal structures of abzyme 21D8.Hotta, K., Lange, H., Tantillo, D.J., Houk, K.N., Hilvert, D., Wilson, I.A.
(2000) J Mol Biol 302: 1213-1225
- PubMed: 11183784
- DOI: https://doi.org/10.1006/jmbi.2000.4503
- Primary Citation of Related Structures:
- PubMed Abstract:
Antibody 21D8 catalyzes the solvent-sensitive decarboxylation of 3-carboxybenzisoxazoles. The crystal structure of chimeric Fab 21D8 with and without hapten at 1.61 A and 2.10 A, respectively, together with computational analysis, shows how a melange of polar and non-polar sites are exploited to achieve both substrate binding and acceleration of a reaction normally facilitated by purely aprotic dipolar media. The striking similarity of the decarboxylase and a series of unrelated esterase antibodies also highlights the chemical versatility of structurally conserved anion binding sites and the relatively subtle changes involved in fine-tuning the immunoglobulin pocket for recognition of different ligands and catalysis of different reactions.
Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.