3ZK8

CRYSTAL STRUCTURE OF PNEUMOCOCCAL SURFACE ANTIGEN PSAA E205Q IN THE METAL-FREE, OPEN STATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.149 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Imperfect Coordination Chemistry Facilitates Metal Ion Release in the Psa Permease.

Counago, R.M.Ween, M.P.Begg, S.L.Bajaj, M.Zuegg, J.O'Mara, M.L.Cooper, M.A.Mcewan, A.G.Paton, J.C.Kobe, B.Mcdevitt, C.A.

(2014) Nat.Chem.Biol. 10: 35

  • DOI: 10.1038/nchembio.1382
  • Primary Citation of Related Structures:  3ZK7, 3ZK9, 3ZKA

  • PubMed Abstract: 
  • The relative stability of divalent first-row transition metal ion complexes, as defined by the Irving-Williams series, poses a fundamental chemical challenge for selectivity in bacterial metal ion acquisition. Here we show that although the substrate ...

    The relative stability of divalent first-row transition metal ion complexes, as defined by the Irving-Williams series, poses a fundamental chemical challenge for selectivity in bacterial metal ion acquisition. Here we show that although the substrate-binding protein of Streptococcus pneumoniae, PsaA, is finely attuned to bind its physiological substrate manganese, it can also bind a broad range of other divalent transition metal cations. By combining high-resolution structural data, metal-binding assays and mutational analyses, we show that the inability of open-state PsaA to satisfy the preferred coordination chemistry of manganese enables the protein to undergo the conformational changes required for cargo release to the Psa permease. This is specific for manganese ions, whereas zinc ions remain bound to PsaA. Collectively, these findings suggest a new ligand binding and release mechanism for PsaA and related substrate-binding proteins that facilitate specificity for divalent cations during competition from zinc ions, which are more abundant in biological systems.


    Related Citations: 
    • A Molecular Mechanism for Bacterial Susceptibility to Zinc.
      Mcdevitt, C.A.,Ogunniyi, A.D.,Valkov, E.,Lawrence, M.C.,Kobe, B.,Mcewan, A.G.,Paton, J.C.
      (2011) Plos Pathog. 7: 02357
    • The Crystal Structure of Pneumococcal Surface Antigen Psaa Reveals a Metal-Binding Site and a Novel Structure for a Putative Abc-Type Binding Protein.
      Lawrence, M.C.,Pilling, P.A.,Epa, V.C.,Berry, A.M.,Ogunniyi, A.D.,Paton, J.C.
      (1998) Structure 6: 1553


    Organizational Affiliation

    1] School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Australia. [2] Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia. [3].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MANGANESE ABC TRANSPORTER SUBSTRATE-BINDING LIPOPROTEIN
A, B
278Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)Gene Names: psaA
Find proteins for P0A4G2 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Go to UniProtKB:  P0A4G2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TRS
Query on TRS

Download SDF File 
Download CCD File 
A, B
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.149 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 39.770α = 106.40
b = 59.070β = 105.05
c = 62.210γ = 93.55
Software Package:
Software NamePurpose
PHASERphasing
Aimlessdata scaling
BUSTERrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2013-11-13
    Type: Database references
  • Version 1.2: 2013-11-20
    Type: Database references
  • Version 1.3: 2014-01-08
    Type: Database references