5OFP

Structure of the antibacterial peptide ABC transporter McjD in an apo inward occluded conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.71 Å
  • R-Value Free: 0.334 
  • R-Value Work: 0.313 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for antibacterial peptide self-immunity by the bacterial ABC transporter McjD.

Bountra, K.Hagelueken, G.Choudhury, H.G.Corradi, V.El Omari, K.Wagner, A.Mathavan, I.Zirah, S.Yuan Wahlgren, W.Tieleman, D.P.Schiemann, O.Rebuffat, S.Beis, K.

(2017) EMBO J. 36: 3062-3079

  • DOI: 10.15252/embj.201797278
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Certain pathogenic bacteria produce and release toxic peptides to ensure either nutrient availability or evasion from the immune system. These peptides are also toxic to the producing bacteria that utilize dedicated ABC transporters to provide self-i ...

    Certain pathogenic bacteria produce and release toxic peptides to ensure either nutrient availability or evasion from the immune system. These peptides are also toxic to the producing bacteria that utilize dedicated ABC transporters to provide self-immunity. The ABC transporter McjD exports the antibacterial peptide MccJ25 in Escherichia coli Our previously determined McjD structure provided some mechanistic insights into antibacterial peptide efflux. In this study, we have determined its structure in a novel conformation, apo inward-occluded and a new nucleotide-bound state, high-energy outward-occluded intermediate state, with a defined ligand binding cavity. Predictive cysteine cross-linking in E. coli membranes and PELDOR measurements along the transport cycle indicate that McjD does not undergo major conformational changes as previously proposed for multi-drug ABC exporters. Combined with transport assays and molecular dynamics simulations, we propose a novel mechanism for toxic peptide ABC exporters that only requires the transient opening of the cavity for release of the peptide. We propose that shielding of the cavity ensures that the transporter is available to export the newly synthesized peptides, preventing toxic-level build-up.


    Related Citations: 
    • Structure of an antibacterial peptide ATP-binding cassette transporter in a novel outward occluded state.
      Choudhury, H.G.,Tong, Z.,Mathavan, I.,Li, Y.,Iwata, S.,Zirah, S.,Rebuffat, S.,van Veen, H.W.,Beis, K.
      (2014) Proc. Natl. Acad. Sci. U.S.A. 111: 9145


    Organizational Affiliation

    Department of Life Sciences, Imperial College London, London, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Microcin-J25 export ATP-binding/permease protein McjD
A
580Escherichia coliMutation(s): 0 
Gene Names: mcjD
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
McjD antimicrobial peptide transporter
Find proteins for Q9X2W0 (Escherichia coli)
Go to UniProtKB:  Q9X2W0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.71 Å
  • R-Value Free: 0.334 
  • R-Value Work: 0.313 
  • Space Group: P 42 2 2
Unit Cell:
Length (Å)Angle (°)
a = 87.850α = 90.00
b = 87.850β = 90.00
c = 351.500γ = 90.00
Software Package:
Software NamePurpose
xia2data reduction
PHASERphasing
MOLREPphasing
BUSTERrefinement
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United KingdomMR/N020103/1

Revision History 

  • Version 1.0: 2017-09-06
    Type: Initial release
  • Version 1.1: 2017-11-22
    Type: Database references