1B5E

DCMP HYDROXYMETHYLASE FROM T4

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.189 

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This is version 1.2 of the entry. See complete history. 

Literature

Crystal structure of deoxycytidylate hydroxymethylase from bacteriophage T4, a component of the deoxyribonucleoside triphosphate-synthesizing complex.

Song, H.K., Sohn, S.H., Suh, S.W.

(1999) EMBO J. 18: 1104-1113

  • DOI: 10.1093/emboj/18.5.1104
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Bacteriophage T4 deoxycytidylate hydroxymethylase (EC 2.1.2.8), a homodimer of 246-residue subunits, catalyzes hydroxymethylation of the cytosine base in deoxycytidylate (dCMP) to produce 5-hydroxymethyl-dCMP. It forms part of a phage DNA protection ...

    Bacteriophage T4 deoxycytidylate hydroxymethylase (EC 2.1.2.8), a homodimer of 246-residue subunits, catalyzes hydroxymethylation of the cytosine base in deoxycytidylate (dCMP) to produce 5-hydroxymethyl-dCMP. It forms part of a phage DNA protection system and appears to function in vivo as a component of a multienzyme complex called deoxyribonucleoside triphosphate (dNTP) synthetase. We have determined its crystal structure in the presence of the substrate dCMP at 1.6 A resolution. The structure reveals a subunit fold and a dimerization pattern in common with thymidylate synthases, despite low (approximately 20%) sequence identity. Among the residues that form the dCMP binding site, those interacting with the sugar and phosphate are arranged in a configuration similar to the deoxyuridylate binding site of thymidylate synthases. However, the residues interacting directly or indirectly with the cytosine base show a more divergent structure and the presumed folate cofactor binding site is more open. Our structure reveals a water molecule properly positioned near C-6 of cytosine to add to the C-7 methylene intermediate during the last step of hydroxymethylation. On the basis of sequence comparison and crystal packing analysis, a hypothetical model for the interaction between T4 deoxycytidylate hydroxymethylase and T4 thymidylate synthase in the dNTP-synthesizing complex has been built.

    Organizational Affiliation: 

    Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (DEOXYCYTIDYLATE HYDROXYMETHYLASE)
A, B
246Enterobacteria phage T4Mutation(s): 0 
Gene Names: 42
EC: 2.1.2.8
Find proteins for P08773 (Enterobacteria phage T4)
Go to UniProtKB:  P08773
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DCM
Query on DCM
Download SDF File 
Download CCD File 
A, B
2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE
C9 H14 N3 O7 P
NCMVOABPESMRCP-SHYZEUOFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.189 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 174.220α = 90.00
b = 53.120β = 115.29
c = 75.170γ = 90.00
Software Package:
Software NamePurpose
CCP4model building
CCP4phasing
SCALEPACKdata scaling
DENZOdata reduction
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance