1YQW

Structure of the Oxidized Unready Form of Ni-Fe Hydrogenase

Summary for 1YQW

• Entry DOI: 10.2210/pdb1yqw/pdb
• Related: 1FRF 1YRQ
• Descriptor: Periplasmic [NiFe] hydrogenase small subunit, CARBONMONOXIDE-(DICYANO) IRON, PEROXIDE ION, ... (12 entities in total)
• Functional Keywords: ni-fe hydrogenase unready state, oxidoreductase
• Biological source: Desulfovibrio fructosovorans; More
• Total number of polymer chains: 6
• Total formula weight: 269725.91

Authors

Volbeda, A. (deposition date: 2005-02-02, release date: 2005-04-19, Last modification date: 2024-10-30)

Primary citation

Volbeda, A.,Martin, L.,Cavazza, C.,Matho, M.,Faber, B.W.,Roseboom, W.,Albracht, S.P.,Garcin, E.,Rousset, M.,Fontecilla-Camps, J.C.
Structural differences between the ready and unready oxidized states of [NiFe] hydrogenases.
J.Biol.Inorg.Chem., 10:239-249, 2005

PubMed Abstract: [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.

PubMed: 15803334
DOI: 10.1007/s00775-005-0632-x

Experimental method

X-RAY DIFFRACTION (1.83 Å)