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This Article ACCEPTED PREPRINT Full Text (PDF) All Versions of this Article: ps.036236.108v1 17/9/1513    most recent Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Havukainen, H. Articles by Papageorgiou, A. C. PubMed PubMed Citation Articles by Havukainen, H. Articles by Papageorgiou, A. C. Social Bookmarking                   What's this?

Structural basis of the zinc- and terbium-mediated inhibition of ferroxidase activity in Dps ferritin-like proteins

¹ Turku Centre for Biotechnology, University of Turku;
² Department of Medical Biochemistry and Molecular Biology, University of Turku

(RECEIVED May 6, 2008; ACCEPTED June 6, 2008)

Streptococcus suis Dpr is an iron-binding protein involved in oxidative stress resistance. It belongs to the bacterial Dps protein family whose members form dodecameric assemblies. Previous studies have shown that zinc and terbium inhibit iron incorporation in Listeria innocua Dps protein. In order to gain structural insights into the inhibitory effect of zinc and terbium, the crystal structures of Streptococcus suis Dpr complexes with these ions were determined at 1.8 Å and 2.1 Å, respectively. Both ions were found to bind at the ferroxidase center and in the same location as iron. In addition, a novel zinc-binding site formed by His40 and His44 was identified. Both His residues were found to be present within all known Streptococcus suis Dpr variants and in Streptococcus pneumoniae, Streptococcus gordonii and Streptococcus sanguinis Dpr proteins. Amino-acid sequence alignment of Dpr with other Dps family members revealed that His44 is highly conserved in contrast to His40. The inhibitory effect of zinc and terbium on iron oxidation in Dpr was studied in vitro and it was found that both ions at concentrations above 0.2 mM almost completely abolish iron binding. These results provide a structural basis for the inhibitory effect of zinc and terbium in the Dps family of proteins, and suggest a potential role of the Dps proteins in zinc detoxification mechanisms involving the second zinc-binding site.

Keywords: Active sites; Metalloproteins; Structure; Crystallography

³ E-mail: tassos.papageorgiou{at}btk.fi

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