In human pathogenic bacteria, nickel is required for the activation of two enzymes, urease and [NiFe]-hydrogenase, necessary for host infection. Acquisition of Ni(II) is mediated by either permeases or ABC-importers, the latter including a subclass t ...
In human pathogenic bacteria, nickel is required for the activation of two enzymes, urease and [NiFe]-hydrogenase, necessary for host infection. Acquisition of Ni(II) is mediated by either permeases or ABC-importers, the latter including a subclass that involves an extracytoplasmic nickel-binding protein, Ni-BP. This study reports on the structure of three Ni-BPs from a diversity of human pathogens and on the existence of three new nickel-binding motifs. These are different from that previously described for Escherichia coli Ni-BP NikA, known to bind nickel via a nickelophore, and indicate a variegated ligand selectivity for Ni-BPs. The structures are consistent with ligand affinities measured in solution by calorimetry and challenge the hypothesis of a general requirement of nickelophores for nickel uptake by canonical ABC importers. Phylogenetic analyses showed that Ni-BPs have different evolutionary origins and emerged independently from peptide-binding proteins, possibly explaining the promiscuous behavior of this class of Ni(II) carriers.
Organizational Affiliation:
University Grenoble Alpes, LCBM, 17, Avenue des Martyrs, 38054 Grenoble Cedex 09, France. Electronic address: christine.cavazza@cea.fr.,Département de Microbiologie, Unité Pathogenèse de Helicobacter, Institut Pasteur, 75724 Paris Cedex 15, France.,Université de Lyon, Université Lyon 1, CNRS, UMR5558, Laboratoire de Biométrie et Biologie Evolutive, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France.,Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Viale Giuseppe Fanin, 40, 40127 Bologna, Italy.,University Grenoble Alpes, Institut de Biologie Structurale (IBS), 38044 Grenoble, France; CNRS, IBS, 38044 Grenoble, France; CEA, IBS, 38044 Grenoble, France.,Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, Viale Giuseppe Fanin, 40, 40127 Bologna, Italy. Electronic address: stefano.ciurli@unibo.it.,INRA, UMR 1319 Micalis, 78350 Jouy en Josas, France; Agro ParisTech, UMR Micalis, 78350 Jouy en Josas, France.
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