1BTL

CRYSTAL STRUCTURE OF ESCHERICHIA COLI TEM1 BETA-LACTAMASE AT 1.8 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of Escherichia coli TEM1 beta-lactamase at 1.8 A resolution.

Jelsch, C.Mourey, L.Masson, J.M.Samama, J.P.

(1993) Proteins 16: 364-383

  • DOI: 10.1002/prot.340160406

  • PubMed Abstract: 
  • The X-ray structure of Escherichia coli TEM1 beta-lactamase has been refined to a crystallographic R-factor of 16.4% for 22,510 reflections between 5.0 and 1.8 A resolution; 199 water molecules and 1 sulphate ion were included in refinement. Except f ...

    The X-ray structure of Escherichia coli TEM1 beta-lactamase has been refined to a crystallographic R-factor of 16.4% for 22,510 reflections between 5.0 and 1.8 A resolution; 199 water molecules and 1 sulphate ion were included in refinement. Except for the tips of a few solvent-exposed side chains, all protein atoms have clear electron density and refined to an average atomic temperature factor of 11 A2. The estimated coordinates error is 0.17 A. The substrate binding site is located at the interface of the two domains of the protein and contains 4 water molecules and the sulphate anion. One of these solvent molecules is found at hydrogen bond distance from S70 and E166. S70 and S130 are hydrogen bonded to K73 and K234, respectively. It was found that the E. coli TEM1 and Staphylococcus aureus PC1 beta-lactamases crystal structures differ in the relative orientations of the two domains composing the enzymes, which result in a narrowed substrate binding cavity in the TEM1 enzyme. Local but significant differences in the vicinity of this site may explain the occurrence of TEM1 natural mutants with extended substrate specificities.


    Related Citations: 
    • Beta-Lactamase Tem1 of E. Coli: Crystal Structure Determination at 2.5 Angstroms Resolution
      Jelsch, C.,Lenfant, F.,Masson, J.M.,Samama, J.P.
      (1992) FEBS Lett. 299: 135
    • Crystal Structure of Escherichia Coli Tem1 Beta-Lactamase at 1.8 Resolution
      Jelsch, C.,Mourey, L.,Masson, J.M.,Samama, J.P.
      (1993) Proteins 16: 364
    • Crystallization and Preliminary Crystallographic Data on E. Coli Tem1 Beta-Lactamase
      Jelsch, C.,Lenfant, F.,Masson, J.M.,Samama, J.P.
      (1992) J.Mol.Biol. 223: 377


    Organizational Affiliation

    Laboratoire de Pharmacologie et de Toxicologie Fondamentales, Toulouse, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-LACTAMASE TEM1
A
263Escherichia coliGene Names: bla, blaT-3, blaT-4, blaT-5, blaT-6
EC: 3.5.2.6
Find proteins for P62593 (Escherichia coli)
Go to UniProtKB:  P62593
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.164 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 43.100α = 90.00
b = 64.400β = 90.00
c = 91.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
X-PLORphasing
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-01-26
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance