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1hd2

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{{STRUCTURE_1hd2| PDB=1hd2 | SCENE= }}
{{STRUCTURE_1hd2| PDB=1hd2 | SCENE= }}
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'''HUMAN PEROXIREDOXIN 5'''
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===HUMAN PEROXIREDOXIN 5===
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==Overview==
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The peroxiredoxins define an emerging family of peroxidases able to reduce hydrogen peroxide and alkyl hydroperoxides with the use of reducing equivalents derived from thiol-containing donor molecules such as thioredoxin, glutathione, trypanothione and AhpF. Peroxiredoxins have been identified in prokaryotes as well as in eukaryotes. Peroxiredoxin 5 (PRDX5) is a novel type of mammalian thioredoxin peroxidase widely expressed in tissues and located cellularly to mitochondria, peroxisomes and cytosol. Functionally, PRDX5 has been implicated in antioxidant protective mechanisms as well as in signal transduction in cells. We report here the 1.5 A resolution crystal structure of human PRDX5 in its reduced form. The crystal structure reveals that PRDX5 presents a thioredoxin-like domain. Interestingly, the crystal structure shows also that PRDX5 does not form a dimer like other mammalian members of the peroxiredoxin family. In the reduced form of PRDX5, Cys47 and Cys151 are distant of 13.8 A although these two cysteine residues are thought to be involved in peroxide reductase activity by forming an intramolecular disulfide intermediate in the oxidized enzyme. These data suggest that the enzyme would necessitate a conformational change to form a disulfide bond between catalytic Cys47 and Cys151 upon oxidation according to proposed peroxide reduction mechanisms. Moreover, the presence of a benzoate ion, a hydroxyl radical scavenger, was noted close to the active-site pocket. The possible role of benzoate in the antioxidant activity of PRDX5 is discussed.
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(as it appears on PubMed at http://www.pubmed.gov), where 11518528 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11518528}}
==About this Structure==
==About this Structure==
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[[Category: Thioredoxin fold]]
[[Category: Thioredoxin fold]]
[[Category: Thioredoxin peroxidase]]
[[Category: Thioredoxin peroxidase]]
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Revision as of 05:00, 1 July 2008

Image:1hd2.png

Template:STRUCTURE 1hd2

HUMAN PEROXIREDOXIN 5

Template:ABSTRACT PUBMED 11518528

About this Structure

1HD2 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of human peroxiredoxin 5, a novel type of mammalian peroxiredoxin at 1.5 A resolution., Declercq JP, Evrard C, Clippe A, Stricht DV, Bernard A, Knoops B, J Mol Biol. 2001 Aug 24;311(4):751-9. PMID:11518528

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