| Literature DB >> 2116666 |
B L Iverson1, S A Iverson, V A Roberts, E D Getzoff, J A Tainer, S J Benkovic, R A Lerner.
Abstract
A metalloantibody has been constructed with a coordination site for metals in the antigen binding pocket. The Zn(II) binding site from carbonic anhydrase B was used as a model. Three histidine residues have been placed in the light chain complementarity determining regions of a single chain antibody molecule. In contrast to the native protein, the mutant displayed metal-dependent fluorescence-quenching behavior. This response was interpreted as evidence for metal binding in the three-histidine site with relative affinities in the order Cu(II) greater than Zn(II) greater than Cd(II). The presence of metal cofactors in immunoglobulins should facilitate antibody catalysis of redox and hydrolytic reactions.Entities:
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Year: 1990 PMID： 2116666 DOI： 10.1126/science.2116666
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728