3KWV

Structural basis for the unfolding of anthrax lethal factor by protective antigen oligomers


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.101 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the unfolding of anthrax lethal factor by protective antigen oligomers.

Feld, G.K.Thoren, K.L.Kintzer, A.F.Sterling, H.J.Tang, I.I.Greenberg, S.G.Williams, E.R.Krantz, B.A.

(2010) Nat.Struct.Mol.Biol. 17: 1383-1390

  • DOI: 10.1038/nsmb.1923

  • PubMed Abstract: 
  • The protein transporter anthrax lethal toxin is composed of protective antigen (PA), a transmembrane translocase, and lethal factor (LF), a cytotoxic enzyme. After its assembly into holotoxin complexes, PA forms an oligomeric channel that unfolds LF ...

    The protein transporter anthrax lethal toxin is composed of protective antigen (PA), a transmembrane translocase, and lethal factor (LF), a cytotoxic enzyme. After its assembly into holotoxin complexes, PA forms an oligomeric channel that unfolds LF and translocates it into the host cell. We report the crystal structure of the core of a lethal toxin complex to 3.1-Å resolution; the structure contains a PA octamer bound to four LF PA-binding domains (LF(N)). The first α-helix and β-strand of each LF(N) unfold and dock into a deep amphipathic cleft on the surface of the PA octamer, which we call the α clamp. The α clamp possesses nonspecific polypeptide binding activity and is functionally relevant to efficient holotoxin assembly, PA octamer formation, and LF unfolding and translocation. This structure provides insight into the mechanism of translocation-coupled protein unfolding.


    Organizational Affiliation

    Department of Chemistry, University of California, Berkeley, California, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protective antigen PA-63
A, B, D, E
548Bacillus anthracisMutation(s): 2 
Gene Names: pagA (pag)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Anthrax Protective Antigen (PA) and Lethal Factor (LF) Prechannel Complex
Find proteins for P13423 (Bacillus anthracis)
Go to UniProtKB:  P13423
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Lethal factor
C, F
263Bacillus anthracisMutation(s): 0 
Gene Names: lef
EC: 3.4.24.83
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Anthrax Protective Antigen (PA) and Lethal Factor (LF) Prechannel Complex
Find proteins for P15917 (Bacillus anthracis)
Go to UniProtKB:  P15917
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, D, E
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.101 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.249 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 178.381α = 90.00
b = 178.381β = 90.00
c = 240.363γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance