7P3R

Helical structure of the toxin MakA from Vibrio cholera


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Protein-lipid interaction at low pH induces oligomerization of the MakA cytotoxin from Vibrio cholerae .

Nadeem, A.Berg, A.Pace, H.Alam, A.Toh, E.Aden, J.Zlatkov, N.Myint, S.L.Persson, K.Grobner, G.Sjostedt, A.Bally, M.Barandun, J.Uhlin, B.E.Wai, S.N.

(2022) Elife 11

  • DOI: 10.7554/eLife.73439
  • Primary Citation of Related Structures:  
    7P3R

  • PubMed Abstract: 
  • The α-pore-forming toxins (α-PFTs) from pathogenic bacteria damage host cell membranes by pore formation. We demonstrate a remarkable, hitherto unknown mechanism by an α-PFT protein from Vibrio cholerae . As part of the MakA/B/E tripartite toxin, MakA is involved in membrane pore formation similar to other α-PFTs ...

    The α-pore-forming toxins (α-PFTs) from pathogenic bacteria damage host cell membranes by pore formation. We demonstrate a remarkable, hitherto unknown mechanism by an α-PFT protein from Vibrio cholerae . As part of the MakA/B/E tripartite toxin, MakA is involved in membrane pore formation similar to other α-PFTs. In contrast, MakA in isolation induces tube-like structures in acidic endosomal compartments of epithelial cells in vitro. The present study unravels the dynamics of tubular growth, which occurs in a pH-, lipid-, and concentration-dependent manner. Within acidified organelle lumens or when incubated with cells in acidic media, MakA forms oligomers and remodels membranes into high-curvature tubes leading to loss of membrane integrity. A 3.7 Å cryo-electron microscopy structure of MakA filaments reveals a unique protein-lipid superstructure. MakA forms a pinecone-like spiral with a central cavity and a thin annular lipid bilayer embedded between the MakA transmembrane helices in its active α-PFT conformation. Our study provides insights into a novel tubulation mechanism of an α-PFT protein and a new mode of action by a secreted bacterial toxin.


    Organizational Affiliation

    The Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, Umeå, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MakA tetramerA, B, C, D369Vibrio cholerae O1 biovar El Tor str. N16961Mutation(s): 0 
Gene Names: VC_A0883
Membrane Entity: Yes 
UniProt
Find proteins for Q9KL64 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KL64 
Go to UniProtKB:  Q9KL64
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KL64
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden2019-02011
European Research Council (ERC)European Union948655
Swedish Research CouncilSweden2018-02914
Swedish Research CouncilSweden2019-01720

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-23
    Type: Initial release