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NiFe hydrogenase properties

The multifrequency EPR and Mdssbauer properties of the [FesSJ in C. vinosum NiFe-hydrogenase are particularly interesting since they provide evidence of magnetic interactions with nearby paramagnetic species (151, 154, 155). The magnetically isolated form exhibits a well-resolved, almost axial EPR signal, g = 2.018, 2.016, 2.002, indicative of minimal conformational heterogeneity. However, a com-... [Pg.26]

Working hypothesis to explain the EPR-spectroscopic properties of the [NiFe] hydrogenase from M. voltae... [Pg.10]

The system made of the Ni-Fe centre and of the proximal [4Fe-4S] centre constitutes the basic functional unit of all [NiFe] hydrogenases. It is therefore especially interesting to investigate its properties by analysing the spin-spin interactions between these centres. Applying this strategy to the Nig-C form of the D. gigas enzyme yielded... [Pg.155]

Figure 7.16 Working hypothesis to explain the EPR-spectroscopic properties of the [NiFe] hydrogenases from M. vo/toe.Thick black lines denote orbitals with d 2 or dy2 yi symmetry bearing the unpaired electron. The direction of the electronic z-axis is indicated by a thin, solid black arrow.The question mark stands for an unknown ligand. See text for further details. (Adapted from Sorgenfrei et al. 1997.)... [Pg.161]

Franco, R., Moura, I., LeGall, J., Peck, H. D. Jr, Huynh, B. H. and Moura, J. J. (1993) Characterization of D. desulfuricans (ATCC 27774) [NiFe] hydrogenase EPR and redox properties of the native and the dihydrogen reacted states. Biocbim. Biopbys. Acta, 1144, 302-8. [Pg.263]

It follows that if an enzyme has a very high turnover frequency, it may be difficult to determine its inherent catalytic properties. The [NiFe]-hydrogenase from Allochromatium vinosum is a good example. A film of this enzyme formed on a PGE electrode displays very high activity for Hz oxidation and, for an atmosphere of 10% Hz, the catalytic current varies with... [Pg.103]

Oudart Y, Artero V, Norel L, Train C, Pecaut J, Fontecave M. Synthesis, crystal structure, magnetic properties and reactivity of a Ni-Ru model of NiFe hydrogenases with apentacoordinatedtriplet (5 = l)Ni(II) center. 7 Organomet Chem 2009 694 2866-2869. [Pg.107]

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See also in sourсe #XX -- [ Pg.5 , Pg.15 , Pg.16 ]



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Hydrogenase

NiFe

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