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1oc3

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[[Image:1oc3.gif|left|200px]]
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{{STRUCTURE_1oc3| PDB=1oc3 | SCENE= }}
{{STRUCTURE_1oc3| PDB=1oc3 | SCENE= }}
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'''HUMAN PEROXIREDOXIN 5'''
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===HUMAN PEROXIREDOXIN 5===
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==Overview==
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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 A 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 the 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 alpha2 helix, which, in the reduced form, contains the peroxidatic Cys47 and the alpha6 helix, which is sequentially close to the resolving residue Cys151. In each monomer of the oxidized chain, the C-terminal part including the alpha6 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.
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The line below this paragraph, {{ABSTRACT_PUBMED_15046979}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 15046979 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15046979}}
==About this Structure==
==About this Structure==
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[[Category: Thioredoxin peroxidase]]
[[Category: Thioredoxin peroxidase]]
[[Category: Transit peptide]]
[[Category: Transit peptide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:39:06 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 16:35:12 2008''

Revision as of 13:35, 28 July 2008

Image:1oc3.png

Template:STRUCTURE 1oc3

HUMAN PEROXIREDOXIN 5

Template:ABSTRACT PUBMED 15046979

About this Structure

1OC3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of a dimeric oxidized form of human peroxiredoxin 5., Evrard C, Capron A, Marchand C, Clippe A, Wattiez R, Soumillion P, Knoops B, Declercq JP, J Mol Biol. 2004 Apr 9;337(5):1079-90. PMID:15046979

Page seeded by OCA on Mon Jul 28 16:35:12 2008

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