6NFS image
Deposition Date 2018-12-20
Release Date 2019-04-24
Last Version Date 2023-10-11
Entry Detail
PDB ID:
6NFS
Title:
CopC from Pseudomonas fluorescens
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.50 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CopC
Chain IDs:A
Chain Length:122
Number of Molecules:1
Biological Source:Pseudomonas fluorescens
Primary Citation
The crystal structure of the CopC protein from Pseudomonas fluorescens reveals amended classifications for the CopC protein family.
J. Inorg. Biochem. 195 194 200 (2019)
PMID: 30981030 DOI: 10.1016/j.jinorgbio.2019.03.007

Abstact

The bacterial CopC family of proteins are periplasmic copper binding proteins that act in copper detoxification. These proteins contain Cu(I) and/or Cu(II) binding sites, with the family that binds Cu(II) only the most prevalent, based on sequence analyses. Here we present three crystal structures of the CopC protein from Pseudomonas fluorescens (Pf-CopC) that include the wild type protein bound to Cu(II) and two variant proteins, where Cu(II) coordinating ligands were mutated, in Cu-free states. We show that the Cu(II) atom in Pf-CopC is coordinated by two His residues, an Asp residue and the N-terminus of the protein (therefore a 3N + O site). This coordination structure is consistent with all structurally characterized proteins from the CopC family to date. Structural and sequence analyses of the CopC family allow a relationship between protein sequence and the Cu(II) binding affinity of these proteins to be proposed.

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Primary Citation of related structures