Crystal structure of Pseudomonas aeruginosa ClpP2

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


ClpP1P2 peptidase activity promotes biofilm formation in Pseudomonas aeruginosa.

Mawla, G.D.Hall, B.M.Carcamo-Oyarce, G.Grant, R.A.Zhang, J.J.Kardon, J.R.Ribbeck, K.Sauer, R.T.Baker, T.A.

(2021) Mol Microbiol 115: 1094-1109

  • DOI: https://doi.org/10.1111/mmi.14649
  • Primary Citation of Related Structures:  
    7M1L, 7M1M

  • PubMed Abstract: 

    Caseinolytic proteases (Clp) are central to bacterial proteolysis and control cellular physiology and stress responses. They are composed of a double-ring compartmentalized peptidase (ClpP) and a AAA+ unfoldase (ClpX or ClpA/ClpC). Unlike many bacteria, the opportunistic pathogen Pseudomonas aeruginosa contains two ClpP homologs: ClpP1 and ClpP2. The specific functions of these homologs, however, are largely elusive. Here, we report that the active form of PaClpP2 is a part of a heteromeric PaClpP1 7 P2 7 tetradecamer that is required for proper biofilm development. PaClpP1 14 and PaClpP1 7 P2 7 complexes exhibit distinct peptide cleavage specificities and interact differentially with P. aeruginosa ClpX and ClpA. Crystal structures reveal that PaClpP2 has non-canonical features in its N- and C-terminal regions that explain its poor interaction with unfoldases. However, experiments in vivo indicate that the PaClpP2 peptidase active site uniquely contributes to biofilm development. These data strongly suggest that the specificity of different classes of ClpP peptidase subunits contributes to the biological outcome of proteolysis. This specialized role of PaClpP2 highlights it as an attractive target for developing antimicrobial agents that interfere specifically with late-stage P. aeruginosa development.

  • Organizational Affiliation

    Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-dependent Clp protease proteolytic subunit
A, B, C, D, E
A, B, C, D, E, F, G
211Pseudomonas aeruginosaMutation(s): 0 
Gene Names: clpP2clpPPAMH19_1747
Find proteins for Q9HYR9 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HYR9 
Go to UniProtKB:  Q9HYR9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HYR9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.372α = 90
b = 147.439β = 121.73
c = 99.338γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI016892

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-24
    Type: Initial release
  • Version 1.1: 2021-06-30
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description