1K82

Crystal structure of E.coli formamidopyrimidine-DNA glycosylase (Fpg) covalently trapped with DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.214 

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


Literature

Structure of formamidopyrimidine-DNA glycosylase covalently complexed to DNA.

Gilboa, R., Zharkov, D.O., Golan, G., Fernandes, A.S., Gerchman, S.E., Matz, E., Kycia, J.H., Grollman, A.P., Shoham, G.

(2002) J Biol Chem 277: 19811-19816

  • DOI: 10.1074/jbc.M202058200
  • Primary Citation of Related Structures:  
    1K82

  • PubMed Abstract: 

    • Formamidopyrimidine-DNA glycosylase (Fpg) is a DNA repair enzyme that excises oxidized purines from damaged DNA. The Schiff base intermediate formed during this reaction between Escherichia coli Fpg and DNA was trapped by reduction with sodium borohydride, and the structure of the resulting covalently cross-linked complex was determined at a 2 ...

    Formamidopyrimidine-DNA glycosylase (Fpg) is a DNA repair enzyme that excises oxidized purines from damaged DNA. The Schiff base intermediate formed during this reaction between Escherichia coli Fpg and DNA was trapped by reduction with sodium borohydride, and the structure of the resulting covalently cross-linked complex was determined at a 2.1-A resolution. Fpg is a bilobal protein with a wide, positively charged DNA-binding groove. It possesses a conserved zinc finger and a helix-two turn-helix motif that participate in DNA binding. The absolutely conserved residues Lys-56, His-70, Asn-168, and Arg-258 form hydrogen bonds to the phosphodiester backbone of DNA, which is sharply kinked at the lesion site. Residues Met-73, Arg-109, and Phe-110 are inserted into the DNA helix, filling the void created by nucleotide eversion. A deep hydrophobic pocket in the active site is positioned to accommodate an everted base. Structural analysis of the Fpg-DNA complex reveals essential features of damage recognition and the catalytic mechanism of Fpg.

    Organizational Affiliation: 

    Department of Inorganic Chemistry and the Laboratory for Structural Chemistry and Biology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
formamidopyrimidine-DNA glycosylaseI [auth A], J [auth B], K [auth C], L [auth D]268Escherichia coliMutation(s): 0 
Gene Names: fpg
EC: 3.2.2.23 (PDB Primary Data), 4.2.99.18 (UniProt)
UniProt
Find proteins for P05523 (Escherichia coli (strain K12))
Explore P05523 
Go to UniProtKB:  P05523
Protein Feature View
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  • Reference Sequence
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    • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    5'-D(*GP*GP*CP*TP*TP*CP*CP*TP*CP*CP*TP*GP*G)-3'A [auth E], C [auth F], E [auth G], G [auth H]13N/A
    Protein Feature View
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    • Reference Sequence
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      • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      5'-D(*CP*CP*AP*GP*GP*AP*(PED)P*GP*AP*AP*GP*CP*C)-3'B [auth I], D [auth J], F [auth K], H [auth L]13N/A
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.10 Å
      • R-Value Free: 0.265 
      • R-Value Work: 0.214 
      • Space Group: P 1 21 1
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 80.704α = 90
      b = 96.033β = 96.799
      c = 96.228γ = 90
      Software Package:
      Software NamePurpose
      GLRFphasing
      CNSrefinement
      DENZOdata reduction
      SCALEPACKdata scaling

      Structure Validation

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      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2002-06-14
        Type: Initial release
      • Version 1.1: 2008-04-27
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Version format compliance