C3larvin toxin, an ADP-ribosyltransferase from Paenibacillus larvae, Orthorhombic Form

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


Structural variability of C3larvin toxin. Intrinsic dynamics of the alpha / beta fold of the C3-like group of mono-ADP-ribosyltransferase toxins.

Lugo, M.R.Ravulapalli, R.Dutta, D.Merrill, A.R.

(2016) J Biomol Struct Dyn 34: 2537-2560

  • DOI: https://doi.org/10.1080/07391102.2015.1123189
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    C3larvin toxin is a new member of the C3 class of the mono-ADP-ribosyltransferase toxin family. The C3 toxins are known to covalently modify small G-proteins, e.g. RhoA, impairing their function, and serving as virulence factors for an offending pathogen. A full-length X-ray structure of C3larvin (2.3 Å) revealed that the characteristic mixed α/β fold consists of a central β-core flanked by two helical regions. Topologically, the protein can be separated into N and C lobes, each formed by a β-sheet and an α-motif, and connected by exposed loops involved in the recognition, binding, and catalysis of the toxin/enzyme, i.e. the ADP-ribosylation turn-turn and phosphate-nicotinamide PN loops. Herein, we provide two new C3larvin X-ray structures and present a systematic study of the toxin dynamics by first analyzing the experimental variability of the X-ray data-set followed by contrasting those results with theoretical predictions based on Elastic Network Models (GNM and ANM). We identify residues that participate in the stability of the N-lobe, putative hinges at loop residues, and energy-favored deformation vectors compatible with conformational changes of the key loops and 3D-subdomains (N/C-lobes), among the X-ray structures. We analyze a larger ensemble of known C3bot1 conformations and conclude that the characteristic 'crab-claw' movement may be driven by the main intrinsic modes of motion. Finally, via computational simulations, we identify harmonic and anharmonic fluctuations that might define the C3larvin 'native state.' Implications for docking protocols are derived.

  • Organizational Affiliation

    a Department of Molecular and Cell Biology , University of Guelph , Science Complex, Guelph , ON N1G2W1 , Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Toxin-like proteinA,
B [auth O]
213Paenibacillus larvae subsp. larvae BRL-230010Mutation(s): 0 
Gene Names: ERIC1_2c04930
Find proteins for W2E3J5 (Paenibacillus larvae subsp. larvae DSM 25719)
Explore W2E3J5 
Go to UniProtKB:  W2E3J5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupW2E3J5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.073α = 90
b = 76.002β = 90
c = 89.367γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.3: 2018-02-14
    Changes: Database references
  • Version 1.4: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description