4IDJ

S.Aureus a-hemolysin monomer in complex with Fab


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.36 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanism of Action and In Vivo Efficacy of a Human-Derived Antibody against Staphylococcus aureus alpha-Hemolysin.

Foletti, D.Strop, P.Shaughnessy, L.Hasa-Moreno, A.Casas, M.G.Russell, M.Bee, C.Wu, S.Pham, A.Zeng, Z.Pons, J.Rajpal, A.Shelton, D.

(2013) J.Mol.Biol. 425: 1641-1654

  • DOI: 10.1016/j.jmb.2013.02.008

  • PubMed Abstract: 
  • The emergence and spread of multi-drug-resistant strains of Staphylococcus aureus in hospitals and in the community emphasize the urgency for the development of novel therapeutic interventions. Our approach was to evaluate the potential of harnessing ...

    The emergence and spread of multi-drug-resistant strains of Staphylococcus aureus in hospitals and in the community emphasize the urgency for the development of novel therapeutic interventions. Our approach was to evaluate the potential of harnessing the human immune system to guide the development of novel therapeutics. We explored the role of preexisting antibodies against S. aureus α-hemolysin in the serum of human individuals by isolating and characterizing one antibody with a remarkably high affinity to α-hemolysin. The antibody provided protection in S. aureus pneumonia, skin, and bacteremia mouse models of infection and also showed therapeutic efficacy when dosed up to 18 h post-infection in the pneumonia model. Additionally, in pneumonia and bacteremia animal models, the therapeutic efficacy of the α-hemolysin antibody appeared additive to the antibiotic linezolid. To better understand the mechanism of action of this isolated antibody, we solved the crystal structure of the α-hemolysin:antibody complex. To our knowledge, this is the first report of the crystal structure of the α-hemolysin monomer. The structure of the complex shows that the antibody binds α-hemolysin between the cap and the rim domains. In combination with biochemical data, the structure suggests that the antibody neutralizes the activity of the toxin by preventing binding to the plasma membrane of susceptible host cells. The data presented here suggest that protective antibodies directed against S. aureus molecules exist in some individuals and that such antibodies have a therapeutic potential either alone or in combination with antibiotics.


    Organizational Affiliation

    Rinat Laboratories, Pfizer Inc., 230 East Grand Avenue, South San Francisco, CA 94080, USA. davide.foletti@pfizer.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-hemolysin
A
295Staphylococcus aureusMutation(s): 0 
Gene Names: hly (hla)
Find proteins for P09616 (Staphylococcus aureus)
Go to UniProtKB:  P09616
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab Heavy chain
H
239N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fab Light chain
L
215N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.36 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.249 
  • Space Group: P 63 2 2
Unit Cell:
Length (Å)Angle (°)
a = 130.188α = 90.00
b = 130.188β = 90.00
c = 308.336γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
BOSdata collection
REFMACrefinement
SCALEPACKdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-12-12 
  • Released Date: 2013-06-26 
  • Deposition Author(s): Strop, P.

Revision History 

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-24
    Type: Source and taxonomy
  • Version 1.2: 2017-11-15
    Type: Refinement description