1f22
From Proteopedia
(New page: 200px<br /><applet load="1f22" size="450" color="white" frame="true" align="right" spinBox="true" caption="1f22" /> '''A PROTON-NMR INVESTIGATION OF THE FULLY REDU...) |
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| - | [[Image:1f22.jpg|left|200px]]<br /><applet load="1f22" size=" | + | [[Image:1f22.jpg|left|200px]]<br /><applet load="1f22" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1f22" /> | caption="1f22" /> | ||
'''A PROTON-NMR INVESTIGATION OF THE FULLY REDUCED CYTOCHROME C7 FROM DESULFUROMONAS ACETOXIDANS. COMPARISON BETWEEN THE REDUCED AND THE OXIDIZED FORMS.'''<br /> | '''A PROTON-NMR INVESTIGATION OF THE FULLY REDUCED CYTOCHROME C7 FROM DESULFUROMONAS ACETOXIDANS. COMPARISON BETWEEN THE REDUCED AND THE OXIDIZED FORMS.'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The solution structure via 1H NMR of the fully reduced form of cytochrome | + | The solution structure via 1H NMR of the fully reduced form of cytochrome c7 has been obtained. The protein sample was kept reduced by addition of catalytic amounts of Desulfovibrio gigas iron hydrogenase in H2 atmosphere after it had been checked that the presence of the hydrogenase did not affect the NMR spectrum. A final family of 35 conformers with rmsd values with respect to the mean structure of 8.7 +/- 1.5 nm and 12.4 +/- 1.3 nm for the backbone and heavy atoms, respectively, was obtained. A highly disordered loop involving residues 54-61 is present. If this loop is ignored, the rmsd values are 6.2 +/- 1.1 nm and 10.2 +/- 1.0 nm for the backbone and heavy atoms, respectively, which represent a reasonable resolution. The structure was analyzed and compared with the already available structure of the fully oxidized protein. Within the indetermination of the two solution structures, the result for the two redox forms is quite similar, confirming the special structural features of the three-heme cluster. A useful comparison can be made with the available crystal structures of cytochromes c3, which appear to be highly homologous except for the presence of a further heme. Finally, an analysis of the factors affecting the reduction potentials of the heme irons was performed, revealing the importance of net charges in differentiating the reduction potential when the other parameters are kept constant. |
==About this Structure== | ==About this Structure== | ||
| - | 1F22 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Desulfuromonas_acetoxidans Desulfuromonas acetoxidans] with HEC as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1F22 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Desulfuromonas_acetoxidans Desulfuromonas acetoxidans] with <scene name='pdbligand=HEC:'>HEC</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F22 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Bertini, I.]] | [[Category: Bertini, I.]] | ||
[[Category: Bruschi, M.]] | [[Category: Bruschi, M.]] | ||
| - | [[Category: Giudici-Orticoni, M | + | [[Category: Giudici-Orticoni, M T.]] |
[[Category: HEC]] | [[Category: HEC]] | ||
[[Category: triheme]] | [[Category: triheme]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:33:55 2008'' |
Revision as of 10:33, 21 February 2008
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A PROTON-NMR INVESTIGATION OF THE FULLY REDUCED CYTOCHROME C7 FROM DESULFUROMONAS ACETOXIDANS. COMPARISON BETWEEN THE REDUCED AND THE OXIDIZED FORMS.
Overview
The solution structure via 1H NMR of the fully reduced form of cytochrome c7 has been obtained. The protein sample was kept reduced by addition of catalytic amounts of Desulfovibrio gigas iron hydrogenase in H2 atmosphere after it had been checked that the presence of the hydrogenase did not affect the NMR spectrum. A final family of 35 conformers with rmsd values with respect to the mean structure of 8.7 +/- 1.5 nm and 12.4 +/- 1.3 nm for the backbone and heavy atoms, respectively, was obtained. A highly disordered loop involving residues 54-61 is present. If this loop is ignored, the rmsd values are 6.2 +/- 1.1 nm and 10.2 +/- 1.0 nm for the backbone and heavy atoms, respectively, which represent a reasonable resolution. The structure was analyzed and compared with the already available structure of the fully oxidized protein. Within the indetermination of the two solution structures, the result for the two redox forms is quite similar, confirming the special structural features of the three-heme cluster. A useful comparison can be made with the available crystal structures of cytochromes c3, which appear to be highly homologous except for the presence of a further heme. Finally, an analysis of the factors affecting the reduction potentials of the heme irons was performed, revealing the importance of net charges in differentiating the reduction potential when the other parameters are kept constant.
About this Structure
1F22 is a Single protein structure of sequence from Desulfuromonas acetoxidans with as ligand. Full crystallographic information is available from OCA.
Reference
A proton-NMR investigation of the fully reduced cytochrome c7 from Desulfuromonas acetoxidans. Comparison between the reduced and the oxidized forms., Assfalg M, Banci L, Bertini I, Bruschi M, Giudici-Orticoni MT, Turano P, Eur J Biochem. 1999 Dec;266(2):634-43. PMID:10561607
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