3UE1

Crystal strucuture of Acinetobacter baumanni PBP1A in complex with MC-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.73 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Distinctive attributes of beta-lactam target proteins in Acinetobacter baumannii relevant to development of new antibiotics

Han, S.Caspers, N.Zaniewski, R.P.Lacey, B.M.Tomaras, A.P.Feng, X.Geoghegan, K.F.Shanmugasundaram, V.

(2011) J.Am.Chem.Soc. 133: 20536-20545

  • DOI: 10.1021/ja208835z
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Multi-drug-resistant forms of the Gram-negative pathogen Acinetobacter baumannii are an emerging threat to human health and further complicate the general problem of treating serious bacterial infections. Meeting this challenge requires an improved u ...

    Multi-drug-resistant forms of the Gram-negative pathogen Acinetobacter baumannii are an emerging threat to human health and further complicate the general problem of treating serious bacterial infections. Meeting this challenge requires an improved understanding of the relationships between the structures of major therapeutic targets in this organism and the activity levels exhibited against it by different antibiotics. Here we report the first crystal structures of A. baumannii penicillin-binding proteins (PBPs) covalently inactivated by four β-lactam antibiotics. We also relate the results to kinetic, biophysical, and computational data. The structure of the class A protein PBP1a was solved in apo form and for its covalent conjugates with benzyl penicillin, imipenem, aztreonam, and the siderophore-conjugated monocarbam MC-1. It included a novel domain genetically spliced into a surface loop of the transpeptidase domain that contains three conserved loops. Also reported here is the first high-resolution structure of the A. baumannii class B enzyme PBP3 in apo form. Comparison of this structure with that of MC-1-derivatized PBP3 of Pseudomonas aeruginosa identified differences between these orthologous proteins in A. baumannii and P. aeruginosa. Thermodynamic analyses indicated that desolvation effects in the PBP3 ligand-binding sites contributed significantly to the thermal stability of the enzyme-antibiotic covalent complexes. Across a significant range of values, they correlated well with results from studies of inactivation kinetics and the protein structures. The structural, biophysical, and computational data help rationalize differences in the functional performance of antibiotics against different protein targets and can be used to guide the design of future agents.


    Organizational Affiliation

    Pfizer Worldwide Research, Eastern Point Road, Groton, Connecticut 06340, USA. seungil.han@pfizer.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Penicillin-binding protein 1a
A, B
731Acinetobacter baumanniiMutation(s): 0 
Gene Names: ponA
Find proteins for G1C794 (Acinetobacter baumannii)
Go to UniProtKB:  G1C794
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UE1
Query on UE1

Download SDF File 
Download CCD File 
A, B
(4S,7Z)-7-(2-amino-1,3-thiazol-4-yl)-1-[({4-[(2R)-2,3-dihydroxypropyl]-3-(4,5-dihydroxypyridin-2-yl)-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl}sulfonyl)amino]-4-formyl-10,10-dimethyl-1,6-dioxo-9-oxa-2,5,8-triazaundec-7-en-11-oate
MC-1 (open form)
C23 H27 N10 O13 S2
CVHWOSQJHWFYSJ-DXKYJFGHSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.73 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.172 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 119.210α = 90.00
b = 244.290β = 90.00
c = 49.470γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
BUSTERrefinement
AutoPROCdata collection
AutoPROCdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-10-28 
  • Released Date: 2011-12-14 
  • Deposition Author(s): Han, S.

Revision History 

  • Version 1.0: 2011-12-14
    Type: Initial release
  • Version 1.1: 2013-06-26
    Type: Database references