Reference : Crystal structure of a dimeric oxidized form of human peroxiredoxin 5
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/2268/64083
Crystal structure of a dimeric oxidized form of human peroxiredoxin 5
English
Evrard, Christine mailto [Université Catholique de Louvain - UCL > Département de Chimie > Unité de Chimie Structurale (CSTR) > >]
Capron, Arnaud [Université Catholique de Louvain - UCL > Département de Chimie > Unité de Chimie Structurale (CSTR) > >]
Marchand, Cécile [Université Catholique de Louvain - UCL > > Institut des sciences de la vie - ISV > >]
Clippe, André mailto [Université Catholique de Louvain - UCL > > Institut des sciences de la vie - ISV > >]
Wattiez, Ruddy mailto [Université de Mons-Hainaut - UMH > > > >]
Soumillion, Patrice mailto [Université Catholique de Louvain - UCL > > Institut des sciences de la vie - ISV > >]
Knoops, Bernard mailto [Université Catholique de Louvain - UCL > > Institut des sciences de la vie - ISV > >]
Declercq, Jean-Paul mailto [Université Catholique de Louvain - UCL > Département de Chimie > Unité de Chimie Structurale (CSTR) > >]
2004
Journal of Molecular Biology
Academic Press
337
1079-1090
Yes (verified by ORBi)
International
0022-2836
1089-8638
London
United Kingdom
[en] antioxidant enzyme ; peroxiredoxin ; thioredoxin fold ; thioredoxin peroxidase ; crystal structure
[en] Peroxiredoxin 5 is the last discovered mammalian member of an ubiquitous family of peroxidases widely distributed among prokaryotes and eukaryotes. Mammalian peroxiredoxin 5 has been recently classified as an atypical 2-Cys peroxiredoxin due to the presence of a conserved peroxidatic N-terminal cysteine (Cys47) and an unconserved resolving C-terminal cysteine residue (Cys151) forming an intramolecular disulfide intermediate in the oxidized enzyme. We have recently reported the crystal structure of human peroxiredoxin 5 in its reduced form. Here, a new crystal form of human peroxiredoxin 5 is described at 2.0 Ǻ resolution. The asymmetric unit contains three polypeptide chains. Surprisingly, beside two reduced chains, the third one is oxidized although the enzyme was crystallized under initial reducing conditions in presence of 1 mM 1,4-dithio-DL-threitol. The oxidized polypeptide chain forms an homodimer with a symmetry related one through intermolecular disulfide bonds between Cys47 and Cys151. The formation of these disulfide bonds is accompanied by the partial unwinding of the N-terminal parts of the a2 helix, which in the reduced form, contains the peroxidatic Cys47 and the α6 helix, which is sequentially close to the resolving residue Cys151. In each monomer of the oxidized chain, the C-terminal part including the α6 helix is completely reorganized and is isolated from the rest of the protein on an extended arm. In the oxidized dimer, the arm belonging to the first monomer now appears at the surface of the second subunit and vice versa.
http://hdl.handle.net/2268/64083
http://www.elsevier.com/wps/find/journaldescription.cws_home/622890/description#description

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