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2hls

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{{STRUCTURE_2hls| PDB=2hls | SCENE= }}
{{STRUCTURE_2hls| PDB=2hls | SCENE= }}
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'''The crystal structure of a protein disulfide oxidoreductase from Aeropyrum pernix k1'''
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===The crystal structure of a protein disulfide oxidoreductase from Aeropyrum pernix k1===
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==Overview==
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The formation of disulfide bonds between cysteine residues is a rate-limiting step in protein folding. To control this oxidative process, different organisms have developed different systems. In bacteria, disulfide bond formation is assisted by the Dsb protein family; in eukarya, disulfide bond formation and rearrangement are catalyzed by PDI. In thermophilic organisms, a potential key role in disulfide bond formation has recently been ascribed to a new cytosolic Protein Disulphide Oxidoreductase family whose members have a molecular mass of about 26 kDa and are characterized by two thioredoxin folds comprising a CXXC active site motif each. Here we report on the functional and structural characterization of ApPDO, a new member of this family, which was isolated from the archaeon Aeropyrum pernix K1. Functional studies have revealed that ApPDO can catalyze the reduction, oxidation and isomerization of disulfide bridges. Structural studies have shown that this protein has two CXXC active sites with fairly similar geometrical parameters typical of a stable conformation. Finally, a theoretical calculation of the cysteine pK(a) values has suggested that the two active sites have similar functional properties and each of them can impart activity to the enzyme. Our results are evidence of functional similarity between the members of the Protein Disulphide Oxidoreductase family and the eukaryotic enzyme PDI. However, as the different three-dimensional features of these two biological systems strongly suggest significantly different mechanisms of action, further experimental studies will be needed to make clear how different three-dimensional structures can result in systems with similar functional behavior.
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(as it appears on PubMed at http://www.pubmed.gov), where 16934838 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16934838}}
==About this Structure==
==About this Structure==
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[[Category: Protein disulfide oxidoreductase]]
[[Category: Protein disulfide oxidoreductase]]
[[Category: Thioredoxin fold]]
[[Category: Thioredoxin fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:24:01 2008''

Revision as of 09:24, 28 July 2008

Image:2hls.png

Template:STRUCTURE 2hls

The crystal structure of a protein disulfide oxidoreductase from Aeropyrum pernix k1

Template:ABSTRACT PUBMED 16934838

About this Structure

2HLS is a Single protein structure of sequence from Aeropyrum pernix. Full crystallographic information is available from OCA.

Reference

A novel member of the protein disulfide oxidoreductase family from Aeropyrum pernix K1: structure, function and electrostatics., D'Ambrosio K, Pedone E, Langella E, De Simone G, Rossi M, Pedone C, Bartolucci S, J Mol Biol. 2006 Sep 29;362(4):743-52. Epub 2006 Jul 28. PMID:16934838

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