Structure of the wild-type C3bot1 Exoenzyme (Nicotinamide-bound state, crystal form I)

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

Starting Model: experimental
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Structural Basis for the Nad-Hydrolysis Mechanism and the Artt-Loop Plasticity of C3 Exoenzymes.

Menetrey, J.Flatau, G.Boquet, P.Menez, A.Stura, E.A.

(2008) Protein Sci 17: 878

  • DOI: https://doi.org/10.1110/ps.073398508
  • Primary Citation of Related Structures:  
    2C89, 2C8A, 2C8B, 2C8C, 2C8D, 2C8E, 2C8F

  • PubMed Abstract: 

    C3-like exoenzymes are ADP-ribosyltransferases that specifically modify some Rho GTPase proteins, leading to their sequestration in the cytoplasm, and thus inhibiting their regulatory activity on the actin cytoskeleton. This modification process goes through three sequential steps involving NAD-hydrolysis, Rho recognition, and binding, leading to Rho ADP-ribosylation. Independently, three distinct residues within the ARTT loop of the C3 exoenzymes are critical for each of these steps. Supporting the critical role of the ARTT loop, we have shown previously that it adopts a distinct conformation upon NAD binding. Here, we present seven wild-type and ARTT loop-mutant structures of C3 exoenzyme of Clostridium botulinum free and bound to its true substrate, NAD, and to its NAD-hydrolysis product, nicotinamide. Altogether, these structures expand our understanding of the conformational diversity of the C3 exoenzyme, mainly within the ARTT loop.

  • Organizational Affiliation

    Institut Curie, Centre de Recherche, Paris F-75248, France. julie.Menetrey@curie.fr

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
211Clostridium botulinumMutation(s): 0 
EC: 2.4.2
Find proteins for Q7M0L1 (Clostridium botulinum)
Explore Q7M0L1 
Go to UniProtKB:  Q7M0L1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7M0L1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.741α = 90
b = 74.638β = 101.04
c = 118.962γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2011-06-02
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description