1yka
From Proteopedia
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'''Solution structure of Grx4, a monothiol glutaredoxin from E. coli.''' | '''Solution structure of Grx4, a monothiol glutaredoxin from E. coli.''' | ||
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[[Category: Sunnerhagen, M.]] | [[Category: Sunnerhagen, M.]] | ||
[[Category: Vlamis-Gardikas, A.]] | [[Category: Vlamis-Gardikas, A.]] | ||
| - | [[Category: | + | [[Category: Mixed alpha/beta fold]] |
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:25:44 2008'' | |
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Revision as of 13:25, 3 May 2008
Solution structure of Grx4, a monothiol glutaredoxin from E. coli.
Overview
The ubiquitous glutaredoxin protein family is present in both prokaryotes and eukaryotes, and is closely related to the thioredoxins, which reduce their substrates using a dithiol mechanism as part of the cellular defense against oxidative stress. Recently identified monothiol glutaredoxins, which must use a different functional mechanism, appear to be essential in both Escherichia coli and yeast and are well conserved in higher order genomes. We have employed high resolution NMR to determine the three-dimensional solution structure of a monothiol glutaredoxin, the reduced E. coli Grx4. The Grx4 structure comprises a glutaredoxin-like alpha-beta fold, founded on a limited set of strictly conserved and structurally critical residues. A tight hydrophobic core, together with a stringent set of secondary structure elements, is thus likely to be present in all monothiol glutaredoxins. A set of exposed and conserved residues form a surface region, implied in glutathione binding from a known structure of E. coli Grx3. The absence of glutaredoxin activity in E. coli Grx4 can be understood based on small but significant differences in the glutathione binding region, and through the lack of a conserved second GSH binding site. MALDI experiments suggest that disulfide formation on glutathionylation is accompanied by significant structural changes, in contrast with dithiol thioredoxins and glutaredoxins, where differences between oxidized and reduced forms are subtle and local. Structural and functional implications are discussed with particular emphasis on identifying common monothiol glutaredoxin properties in substrate specificity and ligand binding events, linking the thioredoxin and glutaredoxin systems.
About this Structure
1YKA is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Molecular mapping of functionalities in the solution structure of reduced Grx4, a monothiol glutaredoxin from Escherichia coli., Fladvad M, Bellanda M, Fernandes AP, Mammi S, Vlamis-Gardikas A, Holmgren A, Sunnerhagen M, J Biol Chem. 2005 Jul 1;280(26):24553-61. Epub 2005 Apr 18. PMID:15840565 Page seeded by OCA on Sat May 3 16:25:44 2008
