4TR5

C3larvin toxin, an ADP-ribosyltransferase from Paenibacillus larvae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

C3larvin Toxin, an ADP-ribosyltransferase from Paenibacillus larvae.

Krska, D.Ravulapalli, R.Fieldhouse, R.J.Lugo, M.R.Merrill, A.R.

(2015) J Biol Chem 290: 1639-1653

  • DOI: 10.1074/jbc.M114.589846
  • Primary Citation of Related Structures:  
    4TR5

  • PubMed Abstract: 
  • C3larvin toxin was identified by a bioinformatic strategy as a putative mono-ADP-ribosyltransferase and a possible virulence factor from Paenibacillus larvae, which is the causative agent of American Foulbrood in honey bees. C3larvin targets RhoA as a substrate for its transferase reaction, and kinetics for both the NAD(+) (Km = 34 ± 12 μm) and RhoA (Km = 17 ± 3 μm) substrates were characterized for this enzyme from the mono-ADP-ribosyltransferase C3 toxin subgroup ...

    C3larvin toxin was identified by a bioinformatic strategy as a putative mono-ADP-ribosyltransferase and a possible virulence factor from Paenibacillus larvae, which is the causative agent of American Foulbrood in honey bees. C3larvin targets RhoA as a substrate for its transferase reaction, and kinetics for both the NAD(+) (Km = 34 ± 12 μm) and RhoA (Km = 17 ± 3 μm) substrates were characterized for this enzyme from the mono-ADP-ribosyltransferase C3 toxin subgroup. C3larvin is toxic to yeast when expressed in the cytoplasm, and catalytic variants of the enzyme lost the ability to kill the yeast host, indicating that the toxin exerts its lethality through its enzyme activity. A small molecule inhibitor of C3larvin enzymatic activity was discovered called M3 (Ki = 11 ± 2 μm), and to our knowledge, is the first inhibitor of transferase activity of the C3 toxin family. C3larvin was crystallized, and its crystal structure (apoenzyme) was solved to 2.3 Å resolution. C3larvin was also shown to have a different mechanism of cell entry from other C3 toxins.


    Organizational Affiliation

    From the Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada, rmerrill@uoguelph.ca.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
C3larvinA213Paenibacillus larvae subsp. larvae BRL-230010Mutation(s): 0 
UniProt
Find proteins for W2E3J5 (Paenibacillus larvae subsp. larvae DSM 25719)
Explore W2E3J5 
Go to UniProtKB:  W2E3J5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.85α = 90
b = 55.85β = 90
c = 120.88γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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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: 2014-12-17
    Type: Initial release
  • Version 1.1: 2014-12-24
    Changes: Database references
  • Version 1.2: 2015-02-11
    Changes: Database references
  • Version 1.3: 2017-09-13
    Changes: Author supporting evidence, Database references, Derived calculations, Other, Source and taxonomy
  • Version 1.4: 2020-01-08
    Changes: Author supporting evidence