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| | {{STRUCTURE_1h2a| PDB=1h2a | SCENE= }} | | {{STRUCTURE_1h2a| PDB=1h2a | SCENE= }} |
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| - | '''SINGLE CRYSTALS OF HYDROGENASE FROM DESULFOVIBRIO VULGARIS'''
| + | ===SINGLE CRYSTALS OF HYDROGENASE FROM DESULFOVIBRIO VULGARIS=== |
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| - | ==Overview==
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| - | BACKGROUND: The hydrogenase of Desulfovibrio sp. catalyzes the reversible oxidoreduction of molecular hydrogen, in conjunction with a specific electron acceptor, cytochrome c3. The Ni-Fe active center of Desulfovibrio hydrogenase has an unusual ligand structure with non-protein ligands. An atomic model at high resolution is required to make concrete assignment of the ligands which coordinate the Ni-Fe center. These in turn will provide insight into the mechanism of electron transfer, during the reaction catalysed by hydrogenase. RESULTS: The X-ray structure of the hydrogenase from Desulfovibrio vulgaris Miyazaki has been solved at 1.8 A resolution and refined to a crystallographic R factor of 0.229. The overall folding pattern and the spatial arrangement of the metal centers are very similar to those found in Desulfovibrio gigas hydrogenase. This high resolution crystal structure enabled us to assign the non-protein ligands to the Fe atom in the Ni-Fe site and revealed the presence of a Mg center, located approximately 13 A from the Ni-Fe active center. CONCLUSIONS: From the nature of the electron-density map, stereochemical geometry and atomic parameters of the refined structure, the most probable candidates for the four ligands, coordinating the Ni-Fe center, have been proposed to be diatomic S=O, C triple bond O and C triple bond N molecules and one sulfur atom. The assignment was supported by pyrolysis mass spectrometry measurements. These ligands may have a role as an electron sink during the electron transfer reaction between the hydrogenase and its biological counterparts, and they could stabilize the redox state of Fe(II), which may not change during the catalytic cycle and is independent of the redox transition of the Ni. The hydrogen-bonding system between the Ni-Fe and the Mg centers suggests the possible.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_9438867}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 9438867 is the PubMed ID number. |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Oxidoreductase]] | | [[Category: Oxidoreductase]] |
| | [[Category: So ligand]] | | [[Category: So ligand]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:19:52 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:30:11 2008'' |
Revision as of 03:30, 1 July 2008
Template:STRUCTURE 1h2a
SINGLE CRYSTALS OF HYDROGENASE FROM DESULFOVIBRIO VULGARIS
Template:ABSTRACT PUBMED 9438867
About this Structure
1H2A is a Protein complex structure of sequences from Desulfovibrio vulgaris. Full crystallographic information is available from OCA.
Reference
Unusual ligand structure in Ni-Fe active center and an additional Mg site in hydrogenase revealed by high resolution X-ray structure analysis., Higuchi Y, Yagi T, Yasuoka N, Structure. 1997 Dec 15;5(12):1671-80. PMID:9438867
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