1s24
From Proteopedia
(New page: 200px<br /><applet load="1s24" size="450" color="white" frame="true" align="right" spinBox="true" caption="1s24" /> '''Rubredoxin domain II from Pseudomonas oleovo...) |
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| - | [[Image:1s24.gif|left|200px]]<br /><applet load="1s24" size=" | + | [[Image:1s24.gif|left|200px]]<br /><applet load="1s24" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1s24" /> | caption="1s24" /> | ||
'''Rubredoxin domain II from Pseudomonas oleovorans'''<br /> | '''Rubredoxin domain II from Pseudomonas oleovorans'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Here we provide insights into the molecular structure of the two-iron | + | Here we provide insights into the molecular structure of the two-iron 19-kDa rubredoxin (AlkG) of Pseudomonas oleovorans using solution-state nuclear magnetic resonance (NMR) and small-angle X-ray scattering studies. Sequence alignment and biochemical studies have suggested that AlkG comprises two rubredoxin folds connected by a linker region of approximately 70 amino acid residues. The C-terminal domain (C-Rb) of this unusual rubredoxin, together with approximately 35 amino acid residues of the predicted linker region, was expressed in Escherichia coli, purified in the one-iron form and the structure of the cadmium-substituted form determined at high-resolution by NMR spectroscopy. The structure shows that the C-Rb domain is similar in fold to the conventional one-iron rubredoxins from other organisms, whereas the linker region does not have any discernible structure. This tandem "flexible-folded" structure of the polypeptide chain derived for the C-Rb protein was confirmed using solution X-ray scattering methods. X-ray scattering studies of AlkG indicated that the 70-amino acid residue linker forms a structured, yet mobile, polypeptide segment connecting the globular N- and C-terminal domains. The X-ray scattering studies also showed that the N-terminal domain (N-Rb) has a molecular conformation similar to that of C-Rb. The restored molecular shape indicates that the folded N-Rb and C-Rb domains of AlkG are noticeably separated, suggesting some domain movement on complex formation with rubredoxin reductase to allow interdomain electron transfer between the metal centers in AlkG. This study demonstrates the advantage of combining X-ray scattering and NMR methods in structural studies of dynamic, multidomain proteins that are not suited to crystallographic analysis. The study forms a structural foundation for functional studies of the interaction and electron-transfer reactions of AlkG with rubredoxin reductase, also reported herein. |
==About this Structure== | ==About this Structure== | ||
| - | 1S24 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_oleovorans Pseudomonas oleovorans] with CD as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1S24 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_oleovorans Pseudomonas oleovorans] with <scene name='pdbligand=CD:'>CD</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S24 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Pseudomonas oleovorans]] | [[Category: Pseudomonas oleovorans]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Grossmann, J | + | [[Category: Grossmann, J G.]] |
| - | [[Category: Lian, L | + | [[Category: Lian, L Y.]] |
[[Category: Perry, A.]] | [[Category: Perry, A.]] | ||
| - | [[Category: Scrutton, N | + | [[Category: Scrutton, N S.]] |
[[Category: Tambyrajah, W.]] | [[Category: Tambyrajah, W.]] | ||
[[Category: CD]] | [[Category: CD]] | ||
[[Category: rubredoxin]] | [[Category: rubredoxin]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:57:05 2008'' |
Revision as of 12:57, 21 February 2008
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Rubredoxin domain II from Pseudomonas oleovorans
Overview
Here we provide insights into the molecular structure of the two-iron 19-kDa rubredoxin (AlkG) of Pseudomonas oleovorans using solution-state nuclear magnetic resonance (NMR) and small-angle X-ray scattering studies. Sequence alignment and biochemical studies have suggested that AlkG comprises two rubredoxin folds connected by a linker region of approximately 70 amino acid residues. The C-terminal domain (C-Rb) of this unusual rubredoxin, together with approximately 35 amino acid residues of the predicted linker region, was expressed in Escherichia coli, purified in the one-iron form and the structure of the cadmium-substituted form determined at high-resolution by NMR spectroscopy. The structure shows that the C-Rb domain is similar in fold to the conventional one-iron rubredoxins from other organisms, whereas the linker region does not have any discernible structure. This tandem "flexible-folded" structure of the polypeptide chain derived for the C-Rb protein was confirmed using solution X-ray scattering methods. X-ray scattering studies of AlkG indicated that the 70-amino acid residue linker forms a structured, yet mobile, polypeptide segment connecting the globular N- and C-terminal domains. The X-ray scattering studies also showed that the N-terminal domain (N-Rb) has a molecular conformation similar to that of C-Rb. The restored molecular shape indicates that the folded N-Rb and C-Rb domains of AlkG are noticeably separated, suggesting some domain movement on complex formation with rubredoxin reductase to allow interdomain electron transfer between the metal centers in AlkG. This study demonstrates the advantage of combining X-ray scattering and NMR methods in structural studies of dynamic, multidomain proteins that are not suited to crystallographic analysis. The study forms a structural foundation for functional studies of the interaction and electron-transfer reactions of AlkG with rubredoxin reductase, also reported herein.
About this Structure
1S24 is a Single protein structure of sequence from Pseudomonas oleovorans with as ligand. Full crystallographic information is available from OCA.
Reference
Solution structure of the two-iron rubredoxin of Pseudomonas oleovorans determined by NMR spectroscopy and solution X-ray scattering and interactions with rubredoxin reductase., Perry A, Tambyrajah W, Grossmann JG, Lian LY, Scrutton NS, Biochemistry. 2004 Mar 23;43(11):3167-82. PMID:15023067
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