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'''GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM''' | '''GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM''' | ||
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[[Category: Otting, G.]] | [[Category: Otting, G.]] | ||
[[Category: Sandstrom, A.]] | [[Category: Sandstrom, A.]] | ||
[[Category: | [[Category: Active site disulfide]] | ||
[[Category: | [[Category: Cis pro 53]] | ||
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Revision as of 16:35, 2 May 2008
GLUTAREDOXIN 3 FROM ESCHERICHIA COLI IN THE FULLY OXIDIZED FORM
OverviewOverview
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 StructureAbout this Structure
1FOV is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
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 Page seeded by OCA on Fri May 2 16:35:18 2008