1G2A

THE CRYSTAL STRUCTURE OF E.COLI PEPTIDE DEFORMYLASE COMPLEXED WITH ACTINONIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Antibiotic activity and characterization of BB-3497, a novel peptide deformylase inhibitor.

Clements, J.M.Beckett, R.P.Brown, A.Catlin, G.Lobell, M.Palan, S.Thomas, W.Whittaker, M.Wood, S.Salama, S.Baker, P.J.Rodgers, H.F.Barynin, V.Rice, D.W.Hunter, M.G.

(2001) Antimicrob Agents Chemother 45: 563-570

  • DOI: 10.1128/AAC.45.2.563-570.2001
  • Primary Citation of Related Structures:  
    1G27, 1G2A

  • PubMed Abstract: 
  • Peptide deformylase (PDF) is an essential bacterial metalloenzyme which deformylates the N-formylmethionine of newly synthesized polypeptides and as such represents a novel target for antibacterial chemotherapy. To identify novel PDF inhibitors, we screened a metalloenzyme inhibitor library and identified an N-formyl-hydroxylamine derivative, BB-3497, and a related natural hydroxamic acid antibiotic, actinonin, as potent and selective inhibitors of PDF ...

    Peptide deformylase (PDF) is an essential bacterial metalloenzyme which deformylates the N-formylmethionine of newly synthesized polypeptides and as such represents a novel target for antibacterial chemotherapy. To identify novel PDF inhibitors, we screened a metalloenzyme inhibitor library and identified an N-formyl-hydroxylamine derivative, BB-3497, and a related natural hydroxamic acid antibiotic, actinonin, as potent and selective inhibitors of PDF. To elucidate the interactions that contribute to the binding affinity of these inhibitors, we determined the crystal structures of BB-3497 and actinonin bound to Escherichia coli PDF at resolutions of 2.1 and 1.75 A, respectively. In both complexes, the active-site metal atom was pentacoordinated by the side chains of Cys 90, His 132, and His 136 and the two oxygen atoms of N-formyl-hydroxylamine or hydroxamate. BB-3497 had activity against gram-positive bacteria, including methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecalis, and activity against some gram-negative bacteria. Time-kill analysis showed that the mode of action of BB-3497 was primarily bacteriostatic. The mechanism of resistance was via mutations within the formyltransferase gene, as previously described for actinonin. While actinonin and its derivatives have not been used clinically because of their poor pharmacokinetic properties, BB-3497 was shown to be orally bioavailable. A single oral dose of BB-3497 given 1 h after intraperitoneal injection of S. aureus Smith or methicillin-resistant S. aureus protected mice from infection with median effective doses of 8 and 14 mg/kg of body weight, respectively. These data validate PDF as a novel target for the design of a new generation of antibacterial agents.


    Organizational Affiliation

    British Biotech Pharmaceuticals Ltd., Oxford OX4 6LY, United Kingdom. clements@britbio.co.uk



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
POLYPEPTIDE DEFORMYLASEA, B, C168Escherichia coliMutation(s): 0 
Gene Names: def
EC: 3.5.1.31 (PDB Primary Data), 3.5.1.88 (UniProt)
UniProt
Find proteins for P0A6K3 (Escherichia coli (strain K12))
Explore P0A6K3 
Go to UniProtKB:  P0A6K3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6K3
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
BB2 BindingDB:  1G2A IC50: min: 6, max: 140 (nM) from 3 assay(s)
PDBBind:  1G2A IC50: 10 (nM) from 1 assay(s)
Binding MOAD:  1G2A IC50: 10 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 138.7α = 90
b = 63.1β = 121.4
c = 85.6γ = 90
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
MAR345data collection
SCALEPACKdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description