Download MendeleyCatalysis 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:
1C5B, 1C5C - 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.
Organizational Affiliation:
Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
