4V3N

Membrane bound pleurotolysin prepore (TMH2 strand lock) trapped with engineered disulphide cross-link


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 14 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Conformational Changes During Pore Formation by the Perforin-Related Protein Pleurotolysin.

Lukoyanova, N.Kondos, S.C.Farabella, I.Law, R.H.P.Reboul, C.F.Caradoc-Davies, T.T.Spicer, B.A.Kleifeld, O.Traore, D.A.K.Ekkel, S.M.Voskoboinik, I.Trapani, J.A.Hatfaludi, T.Oliver, K.Hotze, E.M.Tweten, R.K.Whisstock, J.C.Topf, M.Saibil, H.R.Dunstone, M.A.

(2015) Plos Biol. 13: 02049

  • DOI: 10.1371/journal.pbio.1002049
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Membrane attack complex/perforin-like (MACPF) proteins comprise the largest superfamily of pore-forming proteins, playing crucial roles in immunity and pathogenesis. Soluble monomers assemble into large transmembrane pores via conformational transiti ...

    Membrane attack complex/perforin-like (MACPF) proteins comprise the largest superfamily of pore-forming proteins, playing crucial roles in immunity and pathogenesis. Soluble monomers assemble into large transmembrane pores via conformational transitions that remain to be structurally and mechanistically characterised. Here we present an 11 Å resolution cryo-electron microscopy (cryo-EM) structure of the two-part, fungal toxin Pleurotolysin (Ply), together with crystal structures of both components (the lipid binding PlyA protein and the pore-forming MACPF component PlyB). These data reveal a 13-fold pore 80 Å in diameter and 100 Å in height, with each subunit comprised of a PlyB molecule atop a membrane bound dimer of PlyA. The resolution of the EM map, together with biophysical and computational experiments, allowed confident assignment of subdomains in a MACPF pore assembly. The major conformational changes in PlyB are a ∼70° opening of the bent and distorted central β-sheet of the MACPF domain, accompanied by extrusion and refolding of two α-helical regions into transmembrane β-hairpins (TMH1 and TMH2). We determined the structures of three different disulphide bond-trapped prepore intermediates. Analysis of these data by molecular modelling and flexible fitting allows us to generate a potential trajectory of β-sheet unbending. The results suggest that MACPF conformational change is triggered through disruption of the interface between a conserved helix-turn-helix motif and the top of TMH2. Following their release we propose that the transmembrane regions assemble into β-hairpins via top down zippering of backbone hydrogen bonds to form the membrane-inserted β-barrel. The intermediate structures of the MACPF domain during refolding into the β-barrel pore establish a structural paradigm for the transition from soluble monomer to pore, which may be conserved across the whole superfamily. The TMH2 region is critical for the release of both TMH clusters, suggesting why this region is targeted by endogenous inhibitors of MACPF function.


    Organizational Affiliation

    Department of Crystallography/Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck College, London, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PLEUROTOLYSIN A
A, B
135Pleurotus ostreatusMutation(s): 0 
Gene Names: plyA (PlyA)
Find proteins for Q8X1M9 (Pleurotus ostreatus)
Go to UniProtKB:  Q8X1M9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PLEUROTOLYSIN B
C
388Pleurotus ostreatusMutation(s): 0 
Gene Names: plyB
Find proteins for Q5W9E8 (Pleurotus ostreatus)
Go to UniProtKB:  Q5W9E8
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 14 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2015-02-18
    Type: Initial release
  • Version 1.1: 2017-08-23
    Type: Data collection, Refinement description