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Mutational Analysis of Potential Zinc-Binding Residues in the Active Site of the Enterococcal d-Ala-d-Ala Dipeptidase VanX

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Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115
Cite this: Biochemistry 1997, 36, 34, 10498–10505
Publication Date (Web):August 26, 1997
Copyright © 1997 American Chemical Society

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    VanX, one of the five proteins required for the vancomycin-resistant phenotype in clinically pathogenic Enterococci, is a zinc-containing d-Ala-d-Ala dipeptidase. To identify potential zinc ligands and begin defining the active site residues, we have mutated the 2 cysteine, 5 histidine, and 4 of the 28 aspartate and glutamate residues in the 202 residue VanX protein. Of 10 mutations, 3 cause inactivation and greater than 90% loss of zinc in purified enzyme samples, implicating His116, Asp123, and His184 as zinc-coordinating residues. Homology searches using the 10 amino acid sequence SxHxxGxAxD, in which histidine and aspartate residues are putative zinc ligands, identified the metal coordinating ligands in the N-terminal domain of the murine Sonic hedgehog protein, which also exhibits an architecture for metal coordination identical to that observed in thermolysin from Bacillus thermoproteolyticus. Furthermore, this 10 amino acid consensus sequence is found in the Streptomycesalbus G zinc-dependent N-acyl-d-Ala-d-Ala carboxypeptidase, an enzyme catalyzing essentially the same d-Ala-d-Ala dipeptide bond cleavage as VanX, suggesting equivalent mechanisms and zinc catalytic site architectures. VanX residue Glu181 is analogous to the Glu143 catalytic base in B. thermoproteolyticus thermolysin, and the E181A VanX mutant has no detectable dipeptidase activity, yet maintains near-stoichiometric zinc content, a result consistent with the participation of the residue as a catalytic base.

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     This research was supported by NIH Grant GM 49338 to C.T.W. I.A.D.L. received postdoctoral fellowship support from the Natural Sciences and Engineering Research Council of Canada.

     D.G.M. and I.A.D.L. contributed equally to this work.


     Corresponding author. Phone:  617-432-1715. FAX:  617-432-0556. E-mail:  [email protected].

     Abstract published in Advance ACS Abstracts, August 1, 1997.

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