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Crystal structure of Klebsiella aerogenes UreE, a nickel- binding metallochaperone for urease activation


Huber,  R.
Huber, Robert / Structure Research, Max Planck Institute of Biochemistry, Max Planck Society;

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Song, H. K., Mulrooney, S. B., Huber, R., & Hausinger, R. P. (2001). Crystal structure of Klebsiella aerogenes UreE, a nickel- binding metallochaperone for urease activation. Journal of Biological Chemistry, 276(52), 49359-49364.

UreE is proposed to be a metallochaperone that delivers nickel ions to urease during activation of this bacterial virulence factor. Wild-type Klebsiella aerogenes UreE binds approximately six nickel ions per homodimer, whereas H144*UreE (a functional C-terminal truncated variant) was previously reported to bind two. We determined the structure of H144*UreE by multi- wavelength anomalous diffraction and refined it to 1.5 Angstrom resolution. The present structure reveals an Hsp40-like peptide-binding domain, an wAtx1-like metal-binding domain, and a flexible C terminus. Three metal-binding sites per dimer, defined by structural analysis of Cu-H144*UreE, are on the opposite face of the Atx1-like domain than observed in the copper metallochaperone. One metal bridges the two subunits via the pair of His-96 residues, whereas the other two sites involve metal coordination by His-110 and His-112 within each subunit. In contrast to the copper metallochaperone mechanism involving thiol ligand exchanges between structurally similar chaperones and target proteins, we propose that the Hsp40-like module interacts with urease apoprotein and/or other urease accessory proteins, while the Atx1-like domain delivers histidyl-bound nickel to the urease active site.