4YT9

Crystal structure of Porphyromonas gingivalis peptidylarginine deiminase (PPAD) substrate-unbound.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure and mechanism of a bacterial host-protein citrullinating virulence factor, Porphyromonas gingivalis peptidylarginine deiminase.

Goulas, T.Mizgalska, D.Garcia-Ferrer, I.Kantyka, T.Guevara, T.Szmigielski, B.Sroka, A.Millan, C.Uson, I.Veillard, F.Potempa, B.Mydel, P.Sola, M.Potempa, J.Gomis-Ruth, F.X.

(2015) Sci Rep 5: 11969-11969

  • DOI: 10.1038/srep11969
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Citrullination is a post-translational modification of higher organisms that deiminates arginines in proteins and peptides. It occurs in physiological processes but also pathologies such as multiple sclerosis, fibrosis, Alzheimer's disease and rheuma ...

    Citrullination is a post-translational modification of higher organisms that deiminates arginines in proteins and peptides. It occurs in physiological processes but also pathologies such as multiple sclerosis, fibrosis, Alzheimer's disease and rheumatoid arthritis (RA). The reaction is catalyzed by peptidylarginine deiminases (PADs), which are found in vertebrates but not in lower organisms. RA has been epidemiologically associated with periodontal disease, whose main infective agent is Porphyromonas gingivalis. Uniquely among microbes, P. gingivalis secretes a PAD, termed PPAD (Porphyromonas peptidylarginine deiminase), which is genetically unrelated to eukaryotic PADs. Here, we studied function of PPAD and its substrate-free, substrate-complex, and substrate-mimic-complex structures. It comprises a flat cylindrical catalytic domain with five-fold α/β-propeller architecture and a C-terminal immunoglobulin-like domain. The PPAD active site is a funnel located on one of the cylinder bases. It accommodates arginines from peptide substrates after major rearrangement of a "Michaelis loop" that closes the cleft. The guanidinium and carboxylate groups of substrates are tightly bound, which explains activity of PPAD against arginines at C-termini but not within peptides. Catalysis is based on a cysteine-histidine-asparagine triad, which is shared with human PAD1-PAD4 and other guanidino-group modifying enzymes. We provide a working mechanism hypothesis based on 18 structure-derived point mutants.


    Organizational Affiliation

    Proteolysis Lab; Department of Structural Biology ("María de Maeztu" Unit of Excellence); Molecular Biology Institute of Barcelona, CSIC; Barcelona Science Park, Helix Building; c/Baldiri Reixac, 15-21; E-08028 Barcelona Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Peptidylarginine deiminase
A
432Porphyromonas gingivalis (strain ATCC BAA-308 / W83)Mutation(s): 0 
EC: 3.5.3.-
Find proteins for Q9RQJ2 (Porphyromonas gingivalis (strain ATCC BAA-308 / W83))
Go to UniProtKB:  Q9RQJ2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
4GJ
Query on 4GJ
A
L-PEPTIDE LINKINGC8 H10 N2 O2 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.157 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 58.560α = 90.00
b = 60.300β = 90.00
c = 113.680γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Arcimboldophasing
XSCALEdata scaling
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-15
    Type: Initial release