5EAQ

Two active site divalent ion in the crystal structure of the hammerhead ribozyme bound to a transition state analog-Mn2+

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report



Literature

Two Active Site Divalent Ions in the Crystal Structure of the Hammerhead Ribozyme Bound to a Transition State Analogue.

Mir, A., Golden, B.L.

(2016) Biochemistry 55: 633-636

  • DOI: 10.1021/acs.biochem.5b01139
  • Primary Citation of Related Structures:  
    5EAO, 5EAQ

  • PubMed Abstract: 

    • The crystal structure of the hammerhead ribozyme bound to the pentavalent transition state analogue vanadate reveals significant rearrangements relative to the previously determined structures. The active site contracts, bringing G10.1 closer to the clea ...

    The crystal structure of the hammerhead ribozyme bound to the pentavalent transition state analogue vanadate reveals significant rearrangements relative to the previously determined structures. The active site contracts, bringing G10.1 closer to the cleavage site and repositioning a divalent metal ion such that it could, ultimately, interact directly with the scissile phosphate. This ion could also position a water molecule to serve as a general acid in the cleavage reaction. A second divalent ion is observed coordinated to O6 of G12. This metal ion is well-placed to help tune the pKA of G12. On the basis of this crystal structure as well as a wealth of biochemical studies, we propose a mechanism in which G12 serves as the general base and a magnesium-bound water serves as a general acid.

    Related Citations: 
    • Two Divalent Metal Ions and Conformational Changes Play Roles in the Hammerhead Ribozyme Cleavage Reaction.
      Mir, A., Chen, J., Robinson, K., Lendy, E., Goodman, J., Neau, D., Golden, B.L.
      (2015) Biochemistry 54: 6369
    Organizational Affiliation: 

    Department of Biochemistry, Purdue University , West Lafayette, Indiana 47907, United States.



Macromolecules
Find similar nucleic acids by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
RNA (48-MER)A48synthetic construct
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    RNA (5'-R(*GP*GP*GP*CP*GP*U*(CVC)*UP*GP*GP*GP*CP*AP*GP*UP*AP*CP*CP*CP*A)-3')B20synthetic construct
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.20 Å
    • R-Value Free: 0.278 
    • R-Value Work: 0.247 
    • R-Value Observed: 0.250 
    • Space Group: C 2 2 21
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 81.251α = 90
    b = 87.419β = 90
    c = 105.539γ = 90
    Software Package:
    Software NamePurpose
    PHENIXrefinement
    HKL-2000data reduction
    HKL-2000data scaling
    PHENIXphasing

    Structure Validation

    View Full Validation Report


    View more in-depth experimental data

    Entry History 

    Deposition Data

    • Deposited Date: 2015-10-16 
    • Released Date: 2016-02-24 
      • Deposition Author(s): Mir, A., Golden, B.L.

    Revision History 

    • Version 1.0: 2016-02-24
      Type: Initial release