Immune Versus Natural Selection: Antibody Aldolases with Enzymic Rates But Broader Scope

Structural and mechanistic studies show that when the selection criteria of the immune system are changed, catalytic antibodies that have the efficiency of natural enzymes evolve, but the catalytic antibodies are much more accepting of a wide range of substrates. The catalytic antibodies were prepar...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 1997-12, Vol.278 (5346), p.2085-2092
Hauptverfasser: Barbas, Carlos F., Heine, Andreas, Zhong, Guofu, Hoffmann, Torsten, Gramatikova, Svetlana, Björnestedt, Robert, List, Benjamin, Anderson, James, Stura, Enrico A., Wilson, Ian A., Lerner, Richard A.
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container_end_page 2092
container_issue 5346
container_start_page 2085
container_title Science (American Association for the Advancement of Science)
container_volume 278
creator Barbas, Carlos F.
Heine, Andreas
Zhong, Guofu
Hoffmann, Torsten
Gramatikova, Svetlana
Björnestedt, Robert
List, Benjamin
Anderson, James
Stura, Enrico A.
Wilson, Ian A.
Lerner, Richard A.
description Structural and mechanistic studies show that when the selection criteria of the immune system are changed, catalytic antibodies that have the efficiency of natural enzymes evolve, but the catalytic antibodies are much more accepting of a wide range of substrates. The catalytic antibodies were prepared by reactive immunization, a process whereby the selection criteria of the immune system are changed from simple binding to chemical reactivity. This process yielded aldolase catalytic antibodies that approximated the rate acceleration of the natural enzyme used in glycolysis. Unlike the natural enzyme, however, the antibody aldolases catalyzed a variety of aldol reactions and decarboxylations. The crystal structure of one of these antibodies identified the reactive lysine residue that was selected in the immunization process. This lysine is deeply buried in a hydrophobic pocket at the base of the binding site, thereby accounting for its perturbed pK$_a$.
doi_str_mv 10.1126/science.278.5346.2085
format Article
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fulltext fulltext
identifier ISSN: 0036-8075
ispartof Science (American Association for the Advancement of Science), 1997-12, Vol.278 (5346), p.2085-2092
issn 0036-8075
1095-9203
language eng
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source MEDLINE; Science Magazine; Jstor Complete Legacy
subjects Active sites
Amino acids
Animals
Antibodies
Antibodies, Catalytic - chemistry
Antibodies, Catalytic - immunology
Antibodies, Catalytic - metabolism
Binding Sites
Biochemistry
Biological and medical sciences
Biotechnology
Catalysis
Catalysts
Catalytic antibodies
Chemistry
Crystallography, X-Ray
Decarboxylation
Enzyme synthesis
Enzymes
Evolution, Molecular
Fructose-Bisphosphate Aldolase - chemistry
Fructose-Bisphosphate Aldolase - immunology
Fructose-Bisphosphate Aldolase - metabolism
Fundamental and applied biological sciences. Psychology
Glycolysis
Hydrogen-Ion Concentration
Immune response
Immune response regulation
Immune system
Immunization
Immunoglobulin Fab Fragments - chemistry
Immunoglobulin Fab Fragments - immunology
Immunoglobulin Fab Fragments - metabolism
Ketones
Kinetics
Lysine - chemistry
Lysine - metabolism
Methods. Procedures. Technologies
Mice
Models, Molecular
Molecules
Organic Chemistry
Physiological aspects
Protein Conformation
Protein engineering
Pyridoxal - metabolism
Reactivity
Regulation
Reprography
Selection Criteria
Selection, Genetic
Substrate Specificity
Synthesis
title Immune Versus Natural Selection: Antibody Aldolases with Enzymic Rates But Broader Scope
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