1axs

MATURE OXY-COPE CATALYTIC ANTIBODY WITH HAPTEN

spinqualitylabelsall models 1axs, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1axs is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: CD, HOP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7Z3Y4_HUMAN Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Antibody catalysis provides an opportunity to examine the evolution of binding energy and its relation to catalytic function in a system that has many parallels with natural enzymes. Here we report such a study involving an antibody AZ-28 that catalyses an oxy-Cope rearrangement, a pericyclic reaction that belongs to a well studied and widely used class of reactions in organic chemistry. Immunization with transition state analogue 1 results in a germline-encoded antibody that catalyses the rearrangement of hexadiene 2 to aldehyde 3 with a rate approaching that of a related pericyclic reaction catalysed by the enzyme chorismate mutase. Affinity maturation gives antibody AZ-28, which has six amino acid substitutions, one of which results in a decrease in catalytic rate. To understand the relationship between binding and catalytic rate in this system we characterized a series of active-site mutants and determined the three-dimensional crystal structure of the complex of AZ-28 with the transition state analogue. This analysis indicates that the activation energy depends on a complex balance of several stereoelectronic effects which are controlled by an extensive network of binding interactions in the active site. Thus in this instance the combinatorial diversity of the immune system provided both an efficient catalyst for a reaction where no enzyme is known, as well as an opportunity to explore the mechanisms and evolution of biological catalysis. The interplay between binding energy and catalysis in the evolution of a catalytic antibody.,Ulrich HD, Mundorff E, Santarsiero BD, Driggers EM, Stevens RC, Schultz PG Nature. 1997 Sep 18;389(6648):271-5. PMID:9305839 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Monoclonal Antibodies 3D structures

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