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The importance of quantitative Mössbauer spectroscopy of MoFe-protein from Azotobacter vinelandii.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dunham, William R. Hagen, Wilfred R. Braaksma, A. Grande, Hans Haaker, H. |
| Copyright Year | 1985 |
| Abstract | The Mössbauer spectra of MoFe-protein of Azotobacter vinelandii, as isolated under dithionite and taken at temperatures from 125 K to 175 K, are the sums of four resolved quadrupole doublets. Our results indicate that the currently accepted interpretation of these doublets can be questioned. Our data reduction method converts the Mössbauer transmission spectra to source lineshape deconvolved absorption spectra linear in iron. We used these absorption spectra to determine the stoichiometry of the Fe clusters in MoFe-protein and we obtained much better fits if we assumed that there are four iron atoms in the 'Fe2+, doublet, two iron atoms in the 'S' doublet, twelve iron atoms in the 'D' doublet and sixteen iron atoms in the 'M' doublet. Therefore we propose that the MoFe-cofactor contains one molybdenum and eight iron atoms ('M'). We also argue that none of the previous Mössbauer spectroscopic studies have been performed on the highest-activity preparation now obtainable, nor has there been any study to prove that the Mössbauer spectra are independent of activity. We consider that the Mössbauer spectroscopic studies of the MoFe-protein of nitrogenase are a re-opened and unsolved problem. |
| Starting Page | 497 |
| Ending Page | 501 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://deepblue.lib.umich.edu/bitstream/handle/2027.42/65965/j.1432-1033.1985.tb08679.x.pdf;sequence=1 |
| PubMed reference number | 3855748v1 |
| Volume Number | 146 |
| Issue Number | 3 |
| Journal | European journal of biochemistry |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Assumed Dithionite Ferrous FesII protein, Azotobacter vinelandii Iron Molybdenum Nitrogenase Quadrupole Seizures Sixteen chemical cofactor |
| Content Type | Text |
| Resource Type | Article |
