Experimental Data Snapshot

  • Resolution: 2.55 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

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This is version 1.4 of the entry. See complete history


Structure of CARDS toxin, a unique ADP-ribosylating and vacuolating cytotoxin from Mycoplasma pneumoniae.

Becker, A.Kannan, T.R.Taylor, A.B.Pakhomova, O.N.Zhang, Y.Somarajan, S.R.Galaleldeen, A.Holloway, S.P.Baseman, J.B.Hart, P.J.

(2015) Proc Natl Acad Sci U S A 112: 5165-5170

  • DOI: https://doi.org/10.1073/pnas.1420308112
  • Primary Citation of Related Structures:  
    4TLV, 4TLW

  • PubMed Abstract: 

    Mycoplasma pneumoniae (Mp) infections cause tracheobronchitis and "walking" pneumonia, and are linked to asthma and other reactive airway diseases. As part of the infectious process, the bacterium expresses a 591-aa virulence factor with both mono-ADP ribosyltransferase (mART) and vacuolating activities known as Community-Acquired Respiratory Distress Syndrome Toxin (CARDS TX). CARDS TX binds to human surfactant protein A and annexin A2 on airway epithelial cells and is internalized, leading to a range of pathogenetic events. Here we present the structure of CARDS TX, a triangular molecule in which N-terminal mART and C-terminal tandem β-trefoil domains associate to form an overall architecture distinct from other well-recognized ADP-ribosylating bacterial toxins. We demonstrate that CARDS TX binds phosphatidylcholine and sphingomyelin specifically over other membrane lipids, and that cell surface binding and internalization activities are housed within the C-terminal β-trefoil domain. The results enhance our understanding of Mp pathogenicity and suggest a novel avenue for the development of therapies to treat Mp-associated asthma and other acute and chronic airway diseases.

  • Organizational Affiliation

    Department of Biochemistry.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ADP-ribosylating toxin CARDS611Mycoplasmoides pneumoniae M129Mutation(s): 0 
Gene Names: MPN_372MP464
EC: 2.4.2
Membrane Entity: Yes 
Find proteins for P75409 (Mycoplasma pneumoniae (strain ATCC 29342 / M129 / Subtype 1))
Explore P75409 
Go to UniProtKB:  P75409
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP75409
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.55 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 178.431α = 90
b = 178.431β = 90
c = 89.521γ = 120
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-08
    Type: Initial release
  • Version 1.1: 2015-04-22
    Changes: Database references
  • Version 1.2: 2015-05-13
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Refinement description