1yrq: Difference between revisions

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[[Image:1yrq.gif|left|200px]]
{{Seed}}
[[Image:1yrq.png|left|200px]]


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{{STRUCTURE_1yrq|  PDB=1yrq  |  SCENE=  }}  
{{STRUCTURE_1yrq|  PDB=1yrq  |  SCENE=  }}  


'''Structure of the ready oxidized form of [NiFe]-hydrogenase'''
===Structure of the ready oxidized form of [NiFe]-hydrogenase===




==Overview==
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[NiFe] hydrogenases catalyze the reversible heterolytic cleavage of molecular hydrogen. Several oxidized, inactive states of these enzymes are known that are distinguishable by their very different activation properties. So far, the structural basis for this difference has not been understood because of lack of relevant crystallographic data. Here, we present the crystal structure of the ready Ni-B state of Desulfovibrio fructosovorans [NiFe] hydrogenase and show it to have a putative mu-hydroxo Ni-Fe bridging ligand at the active site. On the other hand, a new, improved refinement procedure of the X-ray diffraction data obtained for putative unready Ni-A/Ni-SU states resulted in a more elongated electron density for the bridging ligand, suggesting that it is a diatomic species. The slow activation of the Ni-A state, compared with the rapid activation of the Ni-B state, is therefore proposed to result from the different chemical nature of the ligands in the two oxidized species. Our results along with very recent electrochemical studies suggest that the diatomic ligand could be hydro-peroxide.
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{{ABSTRACT_PUBMED_15803334}}


==About this Structure==
==About this Structure==
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[[Category: Hydroxide bridge]]
[[Category: Hydroxide bridge]]
[[Category: Nib state]]
[[Category: Nib state]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 16:41:56 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 10 12:36:48 2008''

Revision as of 09:36, 10 July 2008

File:1yrq.png

Template:STRUCTURE 1yrq

Structure of the ready oxidized form of [NiFe]-hydrogenase

Template:ABSTRACT PUBMED 15803334

About this Structure

1YRQ is a Protein complex structure of sequences from Desulfovibrio fructosovorans. Full crystallographic information is available from OCA.

Reference

Structural differences between the ready and unready oxidized states of [NiFe] hydrogenases., Volbeda A, Martin L, Cavazza C, Matho M, Faber BW, Roseboom W, Albracht SP, Garcin E, Rousset M, Fontecilla-Camps JC, J Biol Inorg Chem. 2005 May;10(3):239-49. Epub 2005 Apr 1. PMID:15803334

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