1QHS

CHLORAMPHENICOL PHOSPHOTRANSFERASE IN COMPLEX WITH CHLORAMPHENICOL FROM STREPTOMYCES VENEZUELAE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

The Crystal Structures of Chloramphenicol Phosphotransferase Reveal a Novel Inactivation Mechanism

Izard, T.Ellis, J.

(2000) EMBO J 19: 2690-2700

  • DOI: https://doi.org/10.1093/emboj/19.11.2690
  • Primary Citation of Related Structures:  
    1QHN, 1QHS, 1QHX, 1QHY

  • PubMed Abstract: 

    Chloramphenicol (Cm), produced by the soil bacterium Streptomyces venezuelae, is an inhibitor of bacterial ribosomal peptidyltransferase activity. The Cm-producing streptomycete modifies the primary (C-3) hydroxyl of the antibiotic by a novel Cm-inactivating enzyme, chloramphenicol 3-O-phosphotransferase (CPT). Here we describe the crystal structures of CPT in the absence and presence of bound substrates. The enzyme is dimeric in a sulfate-free solution and tetramerization is induced by ammonium sulfate, the crystallization precipitant. The tetrameric quaternary structure exhibits crystallographic 222 symmetry and has ATP binding pockets located at a crystallographic 2-fold axis. Steric hindrance allows only one ATP to bind per dimer within the tetramer. In addition to active site binding by Cm, an electron-dense feature resembling the enzyme's product is found at the other subunit interface. The structures of CPT suggest that an aspartate acts as a general base to accept a proton from the 3-hydroxyl of Cm, concurrent with nucleophilic attack of the resulting oxyanion on the gamma-phosphate of ATP. Comparison between liganded and substrate-free CPT structures highlights side chain movements of the active site's Arg136 guanidinium group of >9 A upon substrate binding.


  • Organizational Affiliation

    Department of Biochemistry, University of Leicester, Leicester LE1 7RH, UK. Tina.Izard@stjude.org


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (CHLORAMPHENICOL PHOSPHOTRANSFERASE)178Streptomyces venezuelaeMutation(s): 0 
EC: 2.7.1
UniProt
Find proteins for Q56148 (Streptomyces venezuelae (strain ATCC 10712 / CBS 650.69 / DSM 40230 / JCM 4526 / NBRC 13096 / PD 04745))
Explore Q56148 
Go to UniProtKB:  Q56148
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56148
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: I 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 200α = 90
b = 200β = 90
c = 200γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2000-06-01 
  • Deposition Author(s): Izard, T.

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-01
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description