Metalloantibodies: mercury(II)-dependent acyl transferases. |
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Authors: | O Brümmer T Z Hoffman K D Janda |
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Institution: | Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. |
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Abstract: | A new approach for the elicitation of metal-dependent catalytic antibodies for ester hydrolysis is described. A coordinatively unsaturated mercury complex 1-(Hg), has been utilized as a hapten to elicit antibodies that incorporate mercury(II) as a Lewis acid cofactor. From a panel of monoclonal antibodies generated to 1-(Hg), antibody 38G2 was found to hydrolyze the ester 3 in the presence of HgCl(2) K(m)app(3)=345 microM; K(m)app(Hg(2+))=87 microM; k(cat)app/k(uncat)=3 x 10(2)]. This is the first example of a biocatalyst that enlists mercuric ion as a cofactor and it is anticipated that this approach will open new avenues for exploitation of metals thought previously beyond the scope of protein catalysts. |
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