1jpr: Difference between revisions

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[[Image:1jpr.jpg|left|200px]]
{{Seed}}
[[Image:1jpr.png|left|200px]]


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{{STRUCTURE_1jpr|  PDB=1jpr  |  SCENE=  }}  
{{STRUCTURE_1jpr|  PDB=1jpr  |  SCENE=  }}  


'''Mn substituted Ribonucleotide reductase R2 from E. coli oxidized by nitric oxide'''
===Mn substituted Ribonucleotide reductase R2 from E. coli oxidized by nitric oxide===




==Overview==
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The di-iron carboxylate proteins constitute a diverse class of non-heme iron enzymes performing a multitude of redox reactions. These reactions usually involve high-valent Fe-oxo species and are thought to be controlled by carboxylate shifts. Owing to their short lifetime, the intermediate structures have so far escaped structural characterization by X-ray crystallography. In an attempt to map the carboxylate conformations available to the protein during different redox states and different ligand environments, we have studied metal-substituted forms of the R2 protein of ribonucleotide reductase from Escherichia coli. In the present work we have solved the crystal structures of Mn-substituted R2 oxidized in two different ways. Oxidation was performed using either nitric oxide or a combination of hydrogen peroxide and hydroxylamine. The two structures are virtually identical, indicating that the oxidation states are the same, most likely a mixed-valent MnII-MnIII centre. One of the carboxylate ligands (D84) adopts a new, so far unseen, conformation, which could participate in the mechanism for radical generation in R2. E238 adopts a bridging-chelating conformation proposed to be important for proper O2 activation but not previously observed in the wild-type enzyme. Probable catalase activity was also observed during the oxidation with H2O2, indicating mechanistic similarities to the di-Mn catalases.
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{{ABSTRACT_PUBMED_11315567}}


==About this Structure==
==About this Structure==
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[[Category: Oxidized by no]]
[[Category: Oxidized by no]]
[[Category: Radical protein]]
[[Category: Radical protein]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:34:15 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:36:41 2008''

Revision as of 17:36, 1 July 2008

File:1jpr.png


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1jpr, resolution 1.88Å (default scene)
Ligands: HG, MN
Activity: Ribonucleoside-diphosphate reductase, with EC number 1.17.4.1
Related: 1jqc
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Mn substituted Ribonucleotide reductase R2 from E. coli oxidized by nitric oxide

Template:ABSTRACT PUBMED 11315567

About this Structure

1JPR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structures of oxidized dinuclear manganese centres in Mn-substituted class I ribonucleotide reductase from Escherichia coli: carboxylate shifts with implications for O2 activation and radical generation., Hogbom M, Andersson ME, Nordlund P, J Biol Inorg Chem. 2001 Mar;6(3):315-23. PMID:11315567

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