1Z79

Crystal structure of an RNA duplex containing site specific 2'-amine substitution at a C-A mismatch (at pH 5)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.217 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structures, reactivity and inferred acylation transition States for 2'-amine substituted RNA.

Gherghe, C.M.Krahn, J.M.Weeks, K.M.

(2005) J Am Chem Soc 127: 13622-13628

  • DOI: 10.1021/ja053647y
  • Primary Citation of Related Structures:  
    1YRM, 1Z7F, 1Z79, 1YY0, 1YZD

  • PubMed Abstract: 
  • Ribose 2'-amine substitutions are broadly useful as structural probes in nucleic acids. In addition, structure-selective chemical reaction at 2'-amine groups is a robust technology for interrogating local nucleotide flexibility and conformational changes in RNA and DNA ...

    Ribose 2'-amine substitutions are broadly useful as structural probes in nucleic acids. In addition, structure-selective chemical reaction at 2'-amine groups is a robust technology for interrogating local nucleotide flexibility and conformational changes in RNA and DNA. We analyzed crystal structures for several RNA duplexes containing 2'-amino cytidine (C(N)) residues that form either C(N)-G base pairs or C(N)-A mismatches. The 2'-amine substitution is readily accommodated in an A-form RNA helix and thus differs from the C2'-endo conformation observed for free nucleosides. The 2'-amide product structure was visualized directly by acylating a C(N)-A mismatch in intact crystals and is also compatible with A-form geometry. To visualize conformations able to facilitate formation of the amide-forming transition state, in which the amine nucleophile carries a positive partial charge, we analyzed crystals of the C(N)-A duplex at pH 5, where the 2'-amine is protonated. The protonated amine moves to form a strong electrostatic interaction with the 3'-phosphodiester. Taken together with solution-phase experiments, 2'-amine acylation is likely facilitated by either of two transition states, both involving precise positioning of the adjacent 3'-phosphodiester group.


    Organizational Affiliation

    Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.



Macromolecules
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    RNA 5'-R(*GP*CP*AP*GP*AP*(A5M)P*UP*UP*AP*AP*AP*UP*CP*UP*GP*C)-3'B [auth A], A [auth B], C16N/A
    Protein Feature View
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    • Reference Sequence
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    CA
    Query on CA

    Download Ideal Coordinates CCD File 
    D [auth C]CALCIUM ION
    Ca
    BHPQYMZQTOCNFJ-UHFFFAOYSA-N
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.55 Å
    • R-Value Free: 0.262 
    • R-Value Work: 0.217 
    • R-Value Observed: 0.217 
    • Space Group: P 31 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 43α = 90
    b = 43β = 90
    c = 122γ = 120
    Software Package:
    Software NamePurpose
    CNSrefinement
    CrystalCleardata reduction
    SCALEPACKdata scaling
    CNSphasing

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2005-10-18
      Type: Initial release
    • Version 1.1: 2008-04-30
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance
    • Version 1.3: 2011-11-16
      Changes: Atomic model