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 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


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
  • Structures With Same Primary Citation

  • 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: 
    • 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 --: --
    • 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
    • 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 U S A 85: 4133
    • Crystallization of a Type III Chloramphenicol Acetyl Transferase
      Leslie, A.G.W., Liddell, J.M., Shaw, W.V.
      (1986) J Mol Biol 188: 283

    Organizational Affiliation

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



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TYPE III CHLORAMPHENICOL ACETYLTRANSFERASEA213Escherichia coliMutation(s): 0 
Gene Names: cat3
EC: 2.3.1.28
Find proteins for P00484 (Escherichia coli)
Explore P00484 
Go to UniProtKB:  P00484
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CLM
Query on CLM

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

Download CCD File 
A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CLMKd:  13000   nM  Binding MOAD
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 = 107.6α = 90
b = 107.6β = 90
c = 123.6γ = 120
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
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance