1axt
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(New page: 200px<br /> <applet load="1axt" size="450" color="white" frame="true" align="right" spinBox="true" caption="1axt, resolution 2.15Å" /> '''IMMUNE VERSUS NATUR...)
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Revision as of 07:19, 18 November 2007
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IMMUNE VERSUS NATURAL SELECTION: ANTIBODY ALDOLASES WITH THE RATES OF NATURAL ENZYMES
Overview
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 pKa.
About this Structure
1AXT is a Protein complex structure of sequences from Mus musculus. Full crystallographic information is available from OCA.
Reference
Immune versus natural selection: antibody aldolases with enzymic rates but broader scope., Barbas CF 3rd, Heine A, Zhong G, Hoffmann T, Gramatikova S, Bjornestedt R, List B, Anderson J, Stura EA, Wilson IA, Lerner RA, Science. 1997 Dec 19;278(5346):2085-92. PMID:9405338
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