5NOM

The structure of the G. violaceus guanidine II riboswitch P1 stem-loop with guanidine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

The Structure of the Guanidine-II Riboswitch.

Huang, L.Wang, J.Lilley, D.M.J.

(2017) Cell Chem Biol 24: 695-702.e2

  • DOI: https://doi.org/10.1016/j.chembiol.2017.05.014
  • Primary Citation of Related Structures:  
    5NDH, 5NDI, 5NEF, 5NEO, 5NEP, 5NEQ, 5NEX, 5NOM

  • PubMed Abstract: 

    The guanidine-II (mini-ykkC) riboswitch is the smallest of the guanidine-responsive riboswitches, comprising two stem loops of similar sequence. We have solved high-resolution crystal structures of both stem loops for the riboswitch from Gloeobacter violaceus. The stem loops have a strong propensity to dimerize by intimate loop-loop interaction. The dimerization creates specific binding pockets for two guanidine molecules, explaining their cooperative binding. Within the binding pockets the ligands are hydrogen bonded to a guanine at O6 and N7, and to successive backbone phosphates. Additionally they are each stacked upon a guanine nucleobase. One side of the pocket has an opening to the solvent, slightly lowering the specificity of ligand binding, and structures with bound methylguanidine, aminoguanidine, and agmatine show how this is possible.


  • Organizational Affiliation

    Cancer Research UK Nucleic Acid Structure Research Group, MSI/WTB Complex, The University of Dundee, Dow Street, Dundee DD1 5EH, UK.


Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
RNA (5'-R(*GP*GP*UP*GP*GP*GP*GP*AP*CP*GP*AP*CP*CP*CP*CP*AP*(CBV)P*C)-3')18Gloeobacter violaceus
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.7α = 90
b = 55.7β = 90
c = 132.58γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
xia2data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-31
    Type: Initial release
  • Version 1.1: 2017-07-05
    Changes: Database references
  • Version 1.2: 2019-03-20
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2019-07-10
    Changes: Data collection
  • Version 1.4: 2024-01-17
    Changes: Data collection, Database references, Refinement description