2MRY

NMR solution structure of copper binding protein in the apo form


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The S2 Cu(i) site in CupA from Streptococcus pneumoniae is required for cellular copper resistance.

Fu, Y.Bruce, K.E.Wu, H.Giedroc, D.P.

(2016) Metallomics 8: 61-70

  • DOI: 10.1039/c5mt00221d

  • PubMed Abstract: 
  • Pathogenic bacteria have evolved copper homeostasis and resistance systems for fighting copper toxicity imposed by the human immune system. Streptococcus pneumoniae is a respiratory pathogen that encodes an obligatorily membrane-anchored Cu(i) bindin ...

    Pathogenic bacteria have evolved copper homeostasis and resistance systems for fighting copper toxicity imposed by the human immune system. Streptococcus pneumoniae is a respiratory pathogen that encodes an obligatorily membrane-anchored Cu(i) binding protein, CupA, and a P1B-type ATPase efflux transporter, CopA. The soluble, cytoplasmic domain of CupA (sCupA) contains a binuclear Cu(i) cluster consisting of S1 and S2 Cu(i) ions. The NMR solution structure of apo-sCupA reveals the same cupredoxin fold of Cu2-sCupA, except that the Cu(i) binding loop (residues 112-116, harboring S2 Cu ligands M113 and M115) is highly dynamic as documented by both backbone and side chain methionine methyl order parameters. In contrast to the more solvent exposed, lower affinity S2 Cu site, the high affinity S1 Cu-coordinating cysteines (C74, C111) are pre-organized in the apo-sCupA structure. Biological experiments reveal that the S1 site is largely dispensable for cellular Cu resistance and may be involved in buffering low cytoplasmic Cu(i). In contrast, the S2 site is essential for Cu resistance. Expression of a chimeric CopZ chaperone fused to the CupA transmembrane helix does not protect S. pneumoniae from copper toxicity and substitution of a predicted cytoplasm-facing Cu(i) entry metal-binding site (MBS) on CopA also gives rise to a Cu-sensitivity phenotype. These findings suggest that CupA and CopA may interact and filling of the CupA S2 site with Cu(i) results in stimulation of cellular copper efflux by CopA.


    Organizational Affiliation

    Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, USA. giedroc@indiana.edu and Graduate Program in Biochemistry, Indiana University, Bloomington, Indiana 47405-7102, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein
A
98Streptococcus pneumoniae serotype 2 (strain D39 / NCTC 7466)Gene Names: spd0634
Find proteins for A0A0M3KKS5 (Streptococcus pneumoniae serotype 2 (strain D39 / NCTC 7466))
Go to UniProtKB:  A0A0M3KKS5
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2017-07-12
    Type: Database references