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Characterization of the [NiFe] hydrogenase from the sulfate reducer Desulfovibrio vulgaris Hildenborough.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Romão, Célia V. Pereira, I. A. Xavier, António V. Legall, Jean Teixeira, Miguel |
| Copyright Year | 1997 |
| Abstract | The [NiFe] hydrogenase from Desulfovibrio vulgaris Hildenborough was isolated from the cytoplasmic membranes and characterized by EPR spectroscopy. It has a total molecular mass of 98.7 kDa (subunits of 66.4 and 32.3 kDa), and contains 1 nickel and 12 Fe atoms per heterodimer. The catalytic activities for hydrogen consumption and production were determined to be 174 and 89 mumol H2.min-1.mg-1, respectively. As isolated, under aerobic conditions, this hydrogenase exhibits EPR signals characteristic of the nickel centers in [NiFe] hydrogenases (Ni-A signal at gx,y,z = 2.32, 2.23 and approximately 2.0 and Ni-B signal at gx,y,z = 2.33, 2.16 and approximately 2.0) as well as an intense quasi-isotropic signal centered at g = 2.02 due to the oxidized [3Fe-4S] center. The redox profile under hydrogen atmosphere is remarkably similar to that of other [NiFe] hydrogenases. The signals observed for the oxidized state disappear, first being substituted by the Ni-C type signal (gx,y,z = 2.19, 2.14, approximately 2.01), which upon long incubation under hydrogen yields the split Ni-C signal due to interaction with the reduced [4Fe-4S] centers. |
| File Format | PDF HTM / HTML |
| DOI | 10.1006/bbrc.1997.7598 |
| Alternate Webpage(s) | https://run.unl.pt/bitstream/10362/4758/1/1997_BBRC_HaseNiFe.pdf |
| PubMed reference number | 9367885 |
| Alternate Webpage(s) | https://doi.org/10.1006/bbrc.1997.7598 |
| Journal | Medline |
| Volume Number | 240 |
| Issue Number | 1 |
| Journal | Biochemical and biophysical research communications |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
