Crystal structure of the R2 subunit of ribonucleotide reductase from Chlamydia trachomatis

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 

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The radical site in chlamydial ribonucleotide reductase defines a new R2 subclass.

Hogbom, M.Stenmark, P.Voevodskaya, N.McClarty, G.Graslund, A.Nordlund, P.

(2004) Science 305: 245-248

  • DOI: https://doi.org/10.1126/science.1098419
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Ribonucleotide reductase (RNR) synthesizes the deoxyribonucleotides for DNA synthesis. The R2 protein of normal class I ribonucleotide reductases contains a diiron site that produces a stable tyrosyl free radical, essential for enzymatic activity. Structural and electron paramagnetic resonance studies of R2 from Chlamydia trachomatis reveal a protein lacking a tyrosyl radical site. Instead, the protein yields an iron-coupled radical upon reconstitution. The coordinating structure of the diiron site is similar to that of diiron oxidases/monoxygenases and supports a role for this radical in the RNR mechanism. The specific ligand pattern in the C. trachomatis R2 metal site characterizes a new group of R2 proteins that so far has been found in eight organisms, three of which are human pathogens.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Stockholm University, Roslagstullsbacken 15, Albanova University Center, SE-10691 Stockholm, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonucleoside-diphosphate reductase beta chain346Chlamydia trachomatisMutation(s): 0 
Gene Names: NRDBCT828
Find proteins for O84835 (Chlamydia trachomatis (strain D/UW-3/Cx))
Explore O84835 
Go to UniProtKB:  O84835
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO84835
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.738α = 90
b = 62.738β = 90
c = 171.797γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2018-03-07
    Changes: Advisory, Data collection
  • Version 1.4: 2024-02-14
    Changes: Advisory, Data collection, Database references, Derived calculations