1Y27

G-riboswitch-guanine complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history. 


Literature

Structural Basis for Discriminative Regulation of Gene Expression by Adenine- and Guanine-Sensing mRNAs

Serganov, A., Yuan, Y.R., Pikovskaya, O., Polonskaia, A., Malinina, L., Phan, A.T., Hobartner, C., Micura, R., Breaker, R.R., Patel, D.J.

(2004) Chem Biol 11: 1729-1741

  • DOI: 10.1016/j.chembiol.2004.11.018
  • Primary Citation of Related Structures:  
    1Y26, 1Y27

  • PubMed Abstract: 

    • Metabolite-sensing mRNAs, or "riboswitches," specifically interact with small ligands and direct expression of the genes involved in their metabolism. Riboswitches contain sensing "aptamer" modules, capable of ligand-induced structural changes, and downstream regions, harboring expression-controlling elements ...

    Metabolite-sensing mRNAs, or "riboswitches," specifically interact with small ligands and direct expression of the genes involved in their metabolism. Riboswitches contain sensing "aptamer" modules, capable of ligand-induced structural changes, and downstream regions, harboring expression-controlling elements. We report the crystal structures of the add A-riboswitch and xpt G-riboswitch aptamer modules that distinguish between bound adenine and guanine with exquisite specificity and modulate expression of two different sets of genes. The riboswitches form tuning fork-like architectures, in which the prongs are held in parallel through hairpin loop interactions, and the internal bubble zippers up to form the purine binding pocket. The bound purines are held by hydrogen bonding interactions involving conserved nucleotides along their entire periphery. Recognition specificity is associated with Watson-Crick pairing of the encapsulated adenine and guanine ligands with uridine and cytosine, respectively.

    Organizational Affiliation: 

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
Bacillus subtilis xptA [auth X]68Bacillus subtilis
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GUN
Query on GUN
Download Ideal Coordinates CCD File 
B [auth X]GUANINE
C5 H5 N5 O
UYTPUPDQBNUYGX-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.632α = 90
b = 50.878β = 90
c = 217.439γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
HKL-2000data scaling
CCP4phasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 2.0: 2019-02-27
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Polymer sequence, Refinement description, Source and taxonomy, Structure summary