1axs: Difference between revisions

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[[Image:1axs.gif|left|200px]]
{{Seed}}
[[Image:1axs.png|left|200px]]


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{{STRUCTURE_1axs|  PDB=1axs  |  SCENE=  }}  
{{STRUCTURE_1axs|  PDB=1axs  |  SCENE=  }}  


'''MATURE OXY-COPE CATALYTIC ANTIBODY WITH HAPTEN'''
===MATURE OXY-COPE CATALYTIC ANTIBODY WITH HAPTEN===




==Overview==
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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.
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{{ABSTRACT_PUBMED_9305839}}


==About this Structure==
==About this Structure==
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[[Category: Fab fragment]]
[[Category: Fab fragment]]
[[Category: Oxy-cope]]
[[Category: Oxy-cope]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 10:49:18 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 17:49:23 2008''

Revision as of 14:49, 30 June 2008

File:1axs.png

Template:STRUCTURE 1axs

MATURE OXY-COPE CATALYTIC ANTIBODY WITH HAPTEN

Template:ABSTRACT PUBMED 9305839

About this Structure

1AXS is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

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

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