1D9F

CRYSTAL STRUCTURE OF THE COMPLEX OF DNA POLYMERASE I KLENOW FRAGMENT WITH DNA TETRAMER CARRYING 2'-O-(3-AMINOPROPYL)-RNA MODIFICATION 5'-D(TT)-AP(U)-D(T)-3'


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural origins of the exonuclease resistance of a zwitterionic RNA.

Teplova, M.Wallace, S.T.Tereshko, V.Minasov, G.Symons, A.M.Cook, P.D.Manoharan, M.Egli, M.

(1999) Proc Natl Acad Sci U S A 96: 14240-14245

  • DOI: 10.1073/pnas.96.25.14240
  • Primary Citation of Related Structures:  
    1D8Y, 1D9D, 1D9F, 1D9H

  • PubMed Abstract: 
  • Nuclease resistance and RNA affinity are key criteria in the search for optimal antisense nucleic acid modifications, but the origins of the various levels of resistance to nuclease degradation conferred by chemical modification of DNA and RNA are currently not understood ...

    Nuclease resistance and RNA affinity are key criteria in the search for optimal antisense nucleic acid modifications, but the origins of the various levels of resistance to nuclease degradation conferred by chemical modification of DNA and RNA are currently not understood. The 2'-O-aminopropyl (AP)-RNA modification displays the highest nuclease resistance among all phosphodiester-based analogues and its RNA binding affinity surpasses that of phosphorothioate DNA by 1 degrees C per modified residue. We found that oligodeoxynucleotides containing AP-RNA residues at their 3' ends competitively inhibit the degradation of single-stranded DNA by the Escherichia coli Klenow fragment (KF) 3'-5' exonuclease and snake venom phosphodiesterase. To shed light on the origins of nuclease resistance brought about by the AP modification, we determined the crystal structure of an A-form DNA duplex with AP-RNA modifications at 1.6-A resolution. In addition, the crystal structures of complexes between short DNA fragments carrying AP-RNA modifications and wild-type KF were determined at resolutions between 2.2 and 3.0 A and compared with the structure of the complex between oligo(dT) and the D355A/E357A KF mutant. The structural models suggest that interference of the positively charged 2'-O-substituent with the metal ion binding site B of the exonuclease allows AP-RNA to effectively slow down degradation.


    Organizational Affiliation

    Department of Molecular Pharmacology, The Drug Discovery Program, Northwestern University Medical School, Chicago, IL 60611-3008, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE IB [auth A]605Escherichia coliMutation(s): 1 
EC: 2.7.7.7
UniProt
Find proteins for P00582 (Escherichia coli (strain K12))
Explore P00582 
Go to UniProtKB:  P00582
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA/RNA (5'-D(*TP*TP)-R(*(U31)P)-D(*T)-3')A [auth B]4N/A
    Protein Feature View
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    • Reference Sequence
    Small Molecules
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.00 Å
    • R-Value Free: 0.243 
    • R-Value Work: 0.224 
    • R-Value Observed: 0.224 
    • Space Group: P 43
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 102.65α = 90
    b = 102.65β = 90
    c = 86.3γ = 90
    Software Package:
    Software NamePurpose
    AMoREphasing
    CNSrefinement
    DENZOdata reduction
    SCALEPACKdata scaling

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 1999-12-02
      Type: Initial release
    • Version 1.1: 2008-04-27
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance