3CLA

REFINED CRYSTAL STRUCTURE OF TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE AT 1.75 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Work: 0.157 

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Literature

Refined crystal structure of type III chloramphenicol acetyltransferase at 1.75 A resolution.

Leslie, A.G.

(1990) J.Mol.Biol. 213: 167-186

  • DOI: 10.1016/S0022-2836(05)80129-9

  • PubMed Abstract: 
  • High level bacterial resistance to chloramphenicol is generally due to O-acetylation of the antibiotic in a reaction catalysed by chloramphenicol acetyltransferase (CAT, EC 2.3.1.28) in which acetyl-coenzyme A is the acyl donor. The crystal structure ...

    High level bacterial resistance to chloramphenicol is generally due to O-acetylation of the antibiotic in a reaction catalysed by chloramphenicol acetyltransferase (CAT, EC 2.3.1.28) in which acetyl-coenzyme A is the acyl donor. The crystal structure of the type III enzyme from Escherichia coli with chloramphenicol bound has been determined and refined at 1.75 A resolution, using a restrained parameter reciprocal space least squares procedure. The refined model, which includes chloramphenicol, 204 solvent molecules and two cobalt ions has a crystallographic R-factor of 18.3% for 27,300 reflections between 6 and 1.75 A resolution. The root-mean-square deviation in bond lengths from ideal values is 0.02 A. The cobalt ions play a crucial role in stabilizing the packing of the molecule in the crystal lattice. CAT is a trimer of identical subunits (monomer Mr 25,000) and the trimeric structure is stabilized by a number of hydrogen bonds, some of which result in the extension of a beta-sheet across the subunit interface. Chloramphenicol binds in a deep pocket located at the boundary between adjacent subunits of the trimer, such that the majority of residues forming the binding pocket belong to one subunit while the catalytically essential histidine belongs to the adjacent subunit. His195 is appropriately positioned to act as a general base catalyst in the reaction, and the required tautomeric stabilization is provided by an unusual interaction with a main-chain carbonyl oxygen.


    Related Citations: 
    • Evidence for Transition-State Stabilization by Serine-148 in the Catalytic Mechanism of Chloramphenicol Acetyltransferase
      Lewendon, A.,Murray, I.A.,Shaw, W.V.,Gibbs, M.R.,Leslie, A.G.W.
      (1990) Biochemistry 29: 2075
    • Substitutions in the Active Site of Chloramphenicol Acetyltransferase. Role of a Conserved Aspartate
      Lewendon, A.,Murray, I.A.,Kleanthous, C.,Cullis, P.M.,Shaw, W.V.
      (1988) Biochemistry 27: 7385
    • Crystallization of a Type III Chloramphenicol Acetyl Transferase
      Leslie, A.G.W.,Liddell, J.M.,Shaw, W.V.
      (1986) J.Mol.Biol. 188: 283
    • Structure of Chloramphenicol Acetyltransferase at 1.75-Angstroms Resolution
      Leslie, A.G.W.,Moody, P.C.E.,Shaw, W.V.
      (1988) Proc.Natl.Acad.Sci.USA 85: 4133
    • Crystal Structure of the Asp-199-Asn Mutant of Chloramphenicol Acetyltransferase to 2.35 Angstroms Resolution. Structural Consequences of Disruption of a Buried Salt-Bridge.
      Gibbs, M.R.,Moody, P.C.E.,Leslie, A.G.W.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Blackett Laboratory, Imperial College, London, U.K.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE
A
213Escherichia coliMutation(s): 0 
Gene Names: cat3
EC: 2.3.1.28
Find proteins for P00484 (Escherichia coli)
Go to UniProtKB:  P00484
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CLM
Query on CLM

Download SDF File 
Download CCD File 
A
CHLORAMPHENICOL
C11 H12 Cl2 N2 O5
WIIZWVCIJKGZOK-RKDXNWHRSA-N
 Ligand Interaction
CO
Query on CO

Download SDF File 
Download CCD File 
A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CLMKd: 13000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Work: 0.157 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 107.600α = 90.00
b = 107.600β = 90.00
c = 123.600γ = 120.00
Software Package:
Software NamePurpose
DERIVrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 1990-07-09 
  • Released Date: 1990-10-15 
  • Deposition Author(s): Leslie, A.G.W.

Revision History 

  • Version 1.0: 1990-10-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance