3PBN

Crystal Structure of Apo PBP3 from Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for effectiveness of siderophore-conjugated monocarbams against clinically relevant strains of Pseudomonas aeruginosa.

Han, S.Zaniewski, R.P.Marr, E.S.Lacey, B.M.Tomaras, A.P.Evdokimov, A.Miller, J.R.Shanmugasundaram, V.

(2010) Proc.Natl.Acad.Sci.USA 107: 22002-22007

  • DOI: 10.1073/pnas.1013092107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Pseudomonas aeruginosa is an opportunistic Gram-negative pathogen that causes nosocomial infections for which there are limited treatment options. Penicillin-binding protein PBP3, a key therapeutic target, is an essential enzyme responsible for the f ...

    Pseudomonas aeruginosa is an opportunistic Gram-negative pathogen that causes nosocomial infections for which there are limited treatment options. Penicillin-binding protein PBP3, a key therapeutic target, is an essential enzyme responsible for the final steps of peptidoglycan synthesis and is covalently inactivated by β-lactam antibiotics. Here we disclose the first high resolution cocrystal structures of the P. aeruginosa PBP3 with both novel and marketed β-lactams. These structures reveal a conformational rearrangement of Tyr532 and Phe533 and a ligand-induced conformational change of Tyr409 and Arg489. The well-known affinity of the monobactam aztreonam for P. aeruginosa PBP3 is due to a distinct hydrophobic aromatic wall composed of Tyr503, Tyr532, and Phe533 interacting with the gem-dimethyl group. The structure of MC-1, a new siderophore-conjugated monocarbam complexed with PBP3 provides molecular insights for lead optimization. Importantly, we have identified a novel conformation that is distinct to the high-molecular-weight class B PBP subfamily, which is identifiable by common features such as a hydrophobic aromatic wall formed by Tyr503, Tyr532, and Phe533 and the structural flexibility of Tyr409 flanked by two glycine residues. This is also the first example of a siderophore-conjugated triazolone-linked monocarbam complexed with any PBP. Energetic analysis of tightly and loosely held computed hydration sites indicates protein desolvation effects contribute significantly to PBP3 binding, and analysis of hydration site energies allows rank ordering of the second-order acylation rate constants. Taken together, these structural, biochemical, and computational studies provide a molecular basis for recognition of P. aeruginosa PBP3 and open avenues for future design of inhibitors of this class of PBPs.


    Organizational Affiliation

    Pfizer Global Research and Development, Eastern Point Road, Groton, CT 06340, USA. seungil.han@pfizer.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Penicillin-binding protein 3
A
538Pseudomonas aeruginosaMutation(s): 0 
Gene Names: pbpB (ftsI, ftsI_1, ftsI_2)
EC: 3.4.16.4
Find proteins for Q51504 (Pseudomonas aeruginosa)
Go to UniProtKB:  Q51504
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 60.170α = 90.00
b = 79.330β = 90.00
c = 90.030γ = 90.00
Software Package:
Software NamePurpose
PHASESphasing
HKL-2000data collection
BUSTERrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-10-20 
  • Released Date: 2010-12-22 
  • Deposition Author(s): Han, S.

Revision History 

  • Version 1.0: 2010-12-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance