Structural evidence for a programmed general base in the active site of a catalytic antibody.Golinelli-Pimpaneau, B., Goncalves, O., Dintinger, T., Blanchard, D., Knossow, M., Tellier, C.
(2000) Proc Natl Acad Sci U S A 97: 9892-9895
- PubMed: 10963661
- DOI: 10.1073/pnas.97.18.9892
- Structures With Same Primary Citation
- PubMed Abstract:
- Mechanism of an Antibody-Catalysed Allylic Isomerization.
Goncalves, O., Dintinger, T., Lebreton, J., Blanchard, D., Tellier, C.
(2000) Biochem J 346: 691
The crystal structure of the complex of a catalytic antibody with its cationic hapten at 1.9-A resolution demonstrates that the hapten amidinium group is stabilized through an ionic pair interaction with the carboxylate of a combining-site residue. T ...
The crystal structure of the complex of a catalytic antibody with its cationic hapten at 1.9-A resolution demonstrates that the hapten amidinium group is stabilized through an ionic pair interaction with the carboxylate of a combining-site residue. The location of this carboxylate allows it to act as a general base in an allylic rearrangement. When compared with structures of other antibody complexes in which the positive moiety of the hapten is stabilized mostly by cation-pi interactions, this structure shows that the amidinium moiety is a useful candidate to elicit a carboxylate in an antibody combining site at a predetermined location with respect to the hapten. More generally, this structure highlights the advantage of a bidentate hapten for the programmed positioning of a chemically reactive residue in an antibody through charge complementarity to the hapten.
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