1H75 image
Deposition Date 2001-07-03
Release Date 2001-08-09
Last Version Date 2024-10-23
Entry Detail
PDB ID:
1H75
Title:
Structural basis for the thioredoxin-like activity profile of the glutaredoxin-like protein NrdH-redoxin from Escherichia coli.
Biological Source:
Source Organism:
ESCHERICHIA COLI (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.21
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:GLUTAREDOXIN-LIKE PROTEIN NRDH
Chain IDs:A
Chain Length:81
Number of Molecules:1
Biological Source:ESCHERICHIA COLI
Primary Citation
Structural Basis for the Thioredoxin-Like Activity Profile of the Glutaredoxin-Like Nrdh-Redoxin from Escherichia Coli
J.Biol.Chem. 276 35836 ? (2001)
PMID: 11441020 DOI: 10.1074/JBC.M105094200

Abstact

NrdH-redoxin is a representative of a class of small redox proteins that contain a conserved CXXC motif and are characterized by a glutaredoxin-like amino acid sequence and thioredoxin-like activity profile. The crystal structure of recombinant Escherichia coli NrdH-redoxin in the oxidized state has been determined at 1.7 A resolution by multiwavelength anomalous diffraction. NrdH-redoxin belongs to the thioredoxin superfamily and is structurally most similar to E. coli glutaredoxin 3 and phage T4 glutaredoxin. The angle between the C-terminal helix alpha3 and strand beta4, which differs between thioredoxin and glutaredoxin, has an intermediate value in NrdH-redoxin. The orientation of this helix is to a large extent determined by an extended hydrogen-bond network involving the highly conserved sequence motif (61)WSGFRP(D/E)(67), which is unique to this subclass of the thioredoxin superfamily. Residues that bind glutathione in glutaredoxins are in general not conserved in NrdH-redoxin, and no glutathione-binding cleft is present. Instead, NrdH-redoxin contains a wide hydrophobic pocket at the surface, similar to thioredoxin. Modeling studies suggest that NrdH-redoxin can interact with E. coli thioredoxin reductase at this pocket and also via a loop that is complementary to a crevice in the reductase in a similar manner as observed in the E. coli thioredoxin-thioredoxin reductase complex.

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