Crystal structure of Penicillin-Binding Protein 5 (PBP5) from Pseudomonas aeruginosa in apo state

Experimental Data Snapshot

  • Resolution: 2.05 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Structural analysis of the role of Pseudomonas aeruginosa penicillin-binding protein 5 in beta-lactam resistance.

Smith, J.D.Kumarasiri, M.Zhang, W.Hesek, D.Lee, M.Toth, M.Vakulenko, S.Fisher, J.F.Mobashery, S.Chen, Y.

(2013) Antimicrob Agents Chemother 57: 3137-3146

  • DOI: https://doi.org/10.1128/AAC.00505-13
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Penicillin-binding protein 5 (PBP5) is one of the most abundant PBPs in Pseudomonas aeruginosa. Although its main function is that of a cell wall dd-carboxypeptidase, it possesses sufficient β-lactamase activity to contribute to the ability of P. aeruginosa to resist the antibiotic activity of the β-lactams. The study of these dual activities is important for understanding the mechanisms of antibiotic resistance by P. aeruginosa, an important human pathogen, and to the understanding of the evolution of β-lactamase activity from the PBP enzymes. We purified a soluble version of P. aeruginosa PBP5 (designated Pa sPBP5) by deletion of its C-terminal membrane anchor. Under in vitro conditions, Pa sPBP5 demonstrates both dd-carboxypeptidase and expanded-spectrum β-lactamase activities. Its crystal structure at a 2.05-Å resolution shows features closely resembling those of the class A β-lactamases, including a shortened loop spanning residues 74 to 78 near the active site and with respect to the conformations adopted by two active-site residues, Ser101 and Lys203. These features are absent in the related PBP5 of Escherichia coli. A comparison of the two Pa sPBP5 monomers in the asymmetric unit, together with molecular dynamics simulations, revealed an active-site flexibility that may explain its carbapenemase activity, a function that is absent in the E. coli PBP5 enzyme. Our functional and structural characterizations underscore the versatility of this PBP5 in contributing to the β-lactam resistance of P. aeruginosa while highlighting how broader β-lactamase activity may be encoded in the structural folds shared by the PBP and serine β-lactamase classes.

  • Organizational Affiliation

    Department of Molecular Medicine, University of South Florida, Tampa, Florida, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
346Pseudomonas aeruginosa UCBPP-PA14Mutation(s): 0 
Gene Names: dacCPA14_12100
Find proteins for A0A0H2ZFH3 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore A0A0H2ZFH3 
Go to UniProtKB:  A0A0H2ZFH3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2ZFH3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.05 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 232.143α = 90
b = 39.909β = 111.03
c = 85.461γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-09-25
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Data collection, Database references, Derived calculations