1BQR image
Deposition Date 1998-08-17
Release Date 1999-08-17
Last Version Date 2024-05-22
Entry Detail
PDB ID:
1BQR
Title:
REDUCED PSEUDOAZURIN
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PSEUDOAZURIN
Gene (Uniprot):bcp
Chain IDs:A
Chain Length:124
Number of Molecules:1
Biological Source:Achromobacter cycloclastes
Ligand Molecules
Primary Citation
Crystal structure determinations of oxidized and reduced pseudoazurins from Achromobacter cycloclastes. Concerted movement of copper site in redox forms with the rearrangement of hydrogen bond at a remote histidine.
J.Biol.Chem. 274 17845 17852 (1999)
PMID: 10364229 DOI: 10.1074/jbc.274.25.17845

Abstact

The crystal structures of oxidized and reduced pseudoazurins from a denitrifying bacterium, Achromobacter cycloclastes IAM1013, have been determined at 1.35- and 1.6-A resolutions, respectively. The copper site in the oxidized state exhibits a distorted tetrahedral structure like those of other pseudoazurins. However, not only a small change of the copper geometry, but concerted peptide bond flips are identified. The imidazole ring of remote His6 has a hydrogen bonding distance of 2.73 A between N-delta1(His6) and O-gamma1(Thr36) in the oxidized protein. When the protein is reduced at pH 6.0, the imidazole ring rotates by 30.3 degrees and moves 1.00 A away from the position of the oxidized state. A new hydrogen bond between N-epsilon2(His6) and O-epsilon1(Glu4) is formed with a distance of 3.03 A, while the hydrogen bond between N-delta1(His6)-O-gamma1(Thr36) is maintained with an interatomic distance of 2.81 A. A concomitant peptide bond flip of main chain between Ile34 and Thr36 occurs.

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Primary Citation of related structures