Download MendeleyStructural basis for a disfavored elimination reaction in catalytic antibody 1D4.
Larsen, N.A., Heine, A., Crane, L., Cravatt, B.F., Lerner, R.A., Wilson, I.A.(2001) J Mol Biol 314: 93-102
- PubMed: 11724535
- DOI: https://doi.org/10.1006/jmbi.2001.5112
- Primary Citation of Related Structures:
1JGU, 1JGV - PubMed Abstract:
Murine antibody 1D4 selectively catalyzes a highly disfavored beta-elimination reaction. Crystal structures of unliganded 1D4 and 1D4 in complex with a transition-state analog (TSA) have elucidated a possible general base mode of catalysis. The structures of the unliganded and liganded Fabs were determined to 1.80 and 1.85 A resolution, respectively. The structure of the complex reveals a binding pocket with high shape complementarity to the TSA, which is recruited to coerce the substrate into the sterically demanding, eclipsed conformation that is required for catalysis. A histidine residue and two water molecules are likely involved in the catalysis. The structure supports either a concerted E2 or stepwise E1cB-like mechanism for elimination. Finally, the liganded 1D4 structure shows minor conformational rearrangements in CDR H2, indicative of induced-fit binding of the hapten. 1D4 has pushed the boundaries of antibody-mediated catalysis into the realm of disfavored reactions and, hence, represents an important milestone in the development of this technology.
Organizational Affiliation:
Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037, USA.
