2C6W

PENICILLIN-BINDING PROTEIN 1A (PBP-1A) FROM STREPTOCOCCUS PNEUMONIAE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of Penicillin-Binding Protein 1A (Pbp1A) Reveals a Mutational Hotspot Implicated in Beta-Lactam Resistance in Streptococcus Pneumoniae.

Contreras-Martel, C.Job, V.Di Guilmi, A.-M.Vernet, T.Dideberg, O.Dessen, A.

(2006) J.Mol.Biol. 355: 684

  • DOI: 10.1016/j.jmb.2005.10.030
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Streptococcus pneumoniae is a major human pathogen whose infections have been treated with beta-lactam antibiotics for over 60 years, but the proliferation of strains that are highly resistant to such drugs is a problem of worldwide concern. Beta-lac ...

    Streptococcus pneumoniae is a major human pathogen whose infections have been treated with beta-lactam antibiotics for over 60 years, but the proliferation of strains that are highly resistant to such drugs is a problem of worldwide concern. Beta-lactams target penicillin-binding proteins (PBPs), membrane-associated enzymes that play essential roles in the peptidoglycan biosynthetic process. Bifunctional PBPs catalyze both the polymerization of glycan chains (glycosyltransfer) and the cross-linking of adjacent pentapeptides (transpeptidation), while monofunctional enzymes catalyze only the latter reaction. Although S. pneumoniae has six PBPs, only three (PBP1a, PBP2x, PBP2b) are major resistance determinants, with PBP1a being the only bifunctional enzyme. PBP1a plays a key role in septum formation during the cell division cycle and its modification is essential for the development of high-level resistance to penicillins and cephalosporins. The crystal structure of a soluble form of pneumococcal PBP1a (PBP1a*) has been solved to 2.6A and reveals that it folds into three domains. The N terminus contains a peptide from the glycosyltransfer domain bound to an interdomain linker region, followed by a central, transpeptidase domain, and a small C-terminal unit. An analysis of PBP1a sequences from drug-resistant clinical strains in light of the structure reveals the existence of a mutational hotspot at the entrance of the catalytic cleft that leads to the modification of the polarity and accessibility of the mutated PBP1a active site. The presence of this hotspot in all variants sequenced to date is of key relevance for the development of novel antibiotherapies for the treatment of beta-lactam-resistant pneumococcal strains.


    Related Citations: 
    • Structural Studies of the Transpeptidase Domain of Pbp1A from Streptococcus Pneumoniae
      Job, V.,Di Guilmi, A.-M.,Martin, L.,Vernet, T.,Dideberg, O.,Dessen, A.
      (2003) Acta Crystallogr.,Sect.D 59: 1067
    • Identification, Purification, and Charactherization of Transpeptidase and Glycosyltransferase Domains of Streptococcus Pneumoniae Penicillin-Binding Protein 1A
      Di Guilmi, A.-M.,Mouz, N.,Andrieu, J.-P.,Hoskins, J.,Jaskunas, S.R.,Gagnon, J.,Dideberg, O.,Vernet, T.
      (1998) J.Bacteriol. 180: 5652


    Organizational Affiliation

    Institut de Biologie Structurale Jean-Pierre Ebel (CNRS/CEA/UJF), Laboratoire de Cristallographie Macromoléculaire, 41 rue Jules Horowitz, Grenoble 38027, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PENICILLIN-BINDING PROTEIN 1A
A
16Streptococcus pneumoniae (strain ATCC BAA-255 / R6)Mutation(s): 0 
Gene Names: pbpA (exp2)
Find proteins for Q8DR59 (Streptococcus pneumoniae (strain ATCC BAA-255 / R6))
Go to UniProtKB:  Q8DR59
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PENICILLIN-BINDING PROTEIN 1A
B
384Streptococcus pneumoniae (strain ATCC BAA-255 / R6)Mutation(s): 0 
Gene Names: pbpA (exp2)
Find proteins for Q8DR59 (Streptococcus pneumoniae (strain ATCC BAA-255 / R6))
Go to UniProtKB:  Q8DR59
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.240 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 109.782α = 90.00
b = 187.256β = 90.00
c = 51.303γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
CNSrefinement
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-12-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance