Reduced and oxidized cytochrome c4 exhibit differences in dynamics
| Autor: | Anne Marie Jørgensen, Hans Erik Mølager Christensen, Fritz G. Parak |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Cytochrome
biology Protein Conformation Cytochrome c Iron Analytical chemistry Temperature General Physics and Astronomy Cytochrome c Group Atmospheric temperature range biology.organism_classification Pseudomonas stutzeri law.invention Crystallography chemistry.chemical_compound Spectroscopy Mossbauer chemistry law Mössbauer spectroscopy biology.protein Recombinant DNA Electron configuration Physical and Theoretical Chemistry Heme Oxidation-Reduction |
| Zdroj: | Physical chemistry chemical physics : PCCP. 7(19) |
| ISSN: | 1463-9076 |
| Popis: | The temperature-dependent dynamics of the fully reduced and fully oxidized forms of Pseudomonas stutzeri cytochrome c4 have been studied by Mössbauer spectroscopy. Prior to the dynamic analysis, an efficient labelling strategy has been developed for the expression of highly enriched (57)Fe recombinant cytochrome c4. Subsequently, the protein has been purified to apparent homogeneity. Mössbauer measurements were recorded in the temperature range 77-240 K for both protein forms. A detailed analysis of the high quality spectra is presented. Based on the information obtained from Mössbauer spectroscopy, similarities and differences between cytochrome c4, cytochrome c and HiPIP are discussed. The obtained results reveal that (a) cytochrome c4 exists in pure low spin electronic configuration in both oxidation states in the temperature range 77-240 K, (b) the heme pocket is more relaxed in cytochrome c4 than in cytochrome c, (c) the reduced cytochrome c4 is the most flexible at low temperatures, and (d) protein specific dynamics are most distinct in the oxidized protein. |
| Databáze: | OpenAIRE |
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