4EN5

Crystal structure of fluoride riboswitch, Tl-Acetate soaked


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.96 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.233 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Fluoride ion encapsulation by Mg2+ ions and phosphates in a fluoride riboswitch.

Ren, A.Rajashankar, K.R.Patel, D.J.

(2012) Nature 486: 85-89

  • DOI: https://doi.org/10.1038/nature11152
  • Primary Citation of Related Structures:  
    3VRS, 4EN5, 4ENA, 4ENB, 4ENC

  • PubMed Abstract: 

    Significant advances in our understanding of RNA architecture, folding and recognition have emerged from structure-function studies on riboswitches, non-coding RNAs whose sensing domains bind small ligands and whose adjacent expression platforms contain RNA elements involved in the control of gene regulation. We now report on the ligand-bound structure of the Thermotoga petrophila fluoride riboswitch, which adopts a higher-order RNA architecture stabilized by pseudoknot and long-range reversed Watson-Crick and Hoogsteen A•U pair formation. The bound fluoride ion is encapsulated within the junctional architecture, anchored in place through direct coordination to three Mg(2+) ions, which in turn are octahedrally coordinated to water molecules and five inwardly pointing backbone phosphates. Our structure of the fluoride riboswitch in the bound state shows how RNA can form a binding pocket selective for fluoride, while discriminating against larger halide ions. The T. petrophila fluoride riboswitch probably functions in gene regulation through a transcription termination mechanism.


  • Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Center, New York, New York 10065, USA.


Macromolecules
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains LengthOrganismImage
Fluoride riboswitch52Thermotoga petrophila
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
TL
Query on TL

Download Ideal Coordinates CCD File 
L [auth A]
M [auth A]
N [auth A]
O [auth A]
P [auth A]
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A]
THALLIUM (I) ION
Tl
ZLUSCZLCHQSJRU-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
B [auth A]
C [auth A]
D [auth A]
E [auth A]
F [auth A]
B [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
F
Query on F

Download Ideal Coordinates CCD File 
K [auth A]FLUORIDE ION
F
KRHYYFGTRYWZRS-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.96 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.205α = 90
b = 77.287β = 90
c = 42.597γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-09
    Type: Initial release
  • Version 1.1: 2012-06-20
    Changes: Database references
  • Version 1.2: 2013-02-13
    Changes: Structure summary
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description