1fov
From Proteopedia
(New page: 200px<br /><applet load="1fov" size="450" color="white" frame="true" align="right" spinBox="true" caption="1fov" /> '''GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE ...) |
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| - | [[Image:1fov.gif|left|200px]]<br /><applet load="1fov" size=" | + | [[Image:1fov.gif|left|200px]]<br /><applet load="1fov" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1fov" /> | caption="1fov" /> | ||
'''GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM'''<br /> | '''GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM'''<br /> | ||
==Overview== | ==Overview== | ||
| - | A high precision NMR structure of oxidized glutaredoxin 3 [C65Y] from | + | A high precision NMR structure of oxidized glutaredoxin 3 [C65Y] from Escherichia coli has been determined. The conformation of the active site including the disulphide bridge is highly similar to those in glutaredoxins from pig liver and T4 phage. A comparison with the previously determined structure of glutaredoxin 3 [C14S, C65Y] in a complex with glutathione reveals conformational changes between the free and substrate-bound form which includes the sidechain of the conserved, active site tyrosine residue. In the oxidized form this tyrosine is solvent exposed, while it adopts a less exposed conformation, stabilized by hydrogen bonds, in the mixed disulfide with glutathione. The structures further suggest that the formation of a covalent linkage between glutathione and glutaredoxin 3 is necessary in order to induce these structural changes upon binding of the glutathione peptide. This could explain the observed low affinity of glutaredoxins for S-blocked glutathione analogues, in spite of the fact that glutaredoxins are highly specific reductants of glutathione mixed disulfides. |
==About this Structure== | ==About this Structure== | ||
| - | 1FOV is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http:// | + | 1FOV is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FOV OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Aslund, F.]] | [[Category: Aslund, F.]] | ||
| - | [[Category: Berndt, K | + | [[Category: Berndt, K D.]] |
[[Category: Holmgren, A.]] | [[Category: Holmgren, A.]] | ||
[[Category: Nordstrand, K.]] | [[Category: Nordstrand, K.]] | ||
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[[Category: cis pro 53]] | [[Category: cis pro 53]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:40:57 2008'' |
Revision as of 10:40, 21 February 2008
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GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM
Overview
A high precision NMR structure of oxidized glutaredoxin 3 [C65Y] from Escherichia coli has been determined. The conformation of the active site including the disulphide bridge is highly similar to those in glutaredoxins from pig liver and T4 phage. A comparison with the previously determined structure of glutaredoxin 3 [C14S, C65Y] in a complex with glutathione reveals conformational changes between the free and substrate-bound form which includes the sidechain of the conserved, active site tyrosine residue. In the oxidized form this tyrosine is solvent exposed, while it adopts a less exposed conformation, stabilized by hydrogen bonds, in the mixed disulfide with glutathione. The structures further suggest that the formation of a covalent linkage between glutathione and glutaredoxin 3 is necessary in order to induce these structural changes upon binding of the glutathione peptide. This could explain the observed low affinity of glutaredoxins for S-blocked glutathione analogues, in spite of the fact that glutaredoxins are highly specific reductants of glutathione mixed disulfides.
About this Structure
1FOV is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
NMR structure of oxidized glutaredoxin 3 from Escherichia coli., Nordstrand K, Sandstrom A, Aslund F, Holmgren A, Otting G, Berndt KD, J Mol Biol. 2000 Oct 27;303(3):423-32. PMID:11031118
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