5OB3

iSpinach aptamer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.004 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure and fluorescence properties of the iSpinach aptamer in complex with DFHBI.

Fernandez-Millan, P.Autour, A.Ennifar, E.Westhof, E.Ryckelynck, M.

(2017) RNA 23: 1788-1795

  • DOI: 10.1261/rna.063008.117

  • PubMed Abstract: 
  • Fluorogenic RNA aptamers are short nucleic acids able to specifically interact with small molecules and strongly enhance their fluorescence upon complex formation. Among the different systems recently introduced, Spinach, an aptamer forming a fluores ...

    Fluorogenic RNA aptamers are short nucleic acids able to specifically interact with small molecules and strongly enhance their fluorescence upon complex formation. Among the different systems recently introduced, Spinach, an aptamer forming a fluorescent complex with the 3,5-difluoro-4-hydroxybenzylidene imidazolinone (DFHBI), is one of the most promising. Using random mutagenesis and ultrahigh-throughput screening, we recently developed iSpinach, an improved version of the aptamer, endowed with an increased folding efficiency and thermal stability. iSpinach is a shorter version of Spinach, comprising five mutations for which the exact role has not yet been deciphered. In this work, we cocrystallized a reengineered version of iSpinach in complex with the DFHBI and solved the X-ray structure of the complex at 2 Å resolution. Only a few mutations were required to optimize iSpinach production and crystallization, underlying the good folding capacity of the molecule. The measured fluorescence half-lives in the crystal were 60% higher than in solution. Comparisons with structures previously reported for Spinach sheds some light on the possible function of the different beneficial mutations carried by iSpinach.


    Organizational Affiliation

    Université de Strasbourg, CNRS, Architecture et Réactivité de l'ARN, UPR 9002, F-67000 Strasbourg, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
RNA aptamer (69-MER)A69synthetic construct
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
SPM
Query on SPM

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Download CCD File 
A
SPERMINE
C10 H26 N4
PFNFFQXMRSDOHW-UHFFFAOYSA-N
 Ligand Interaction
1TU
Query on 1TU

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Download CCD File 
A
4-(3,5-difluoro-4-hydroxybenzyl)-1,2-dimethyl-1H-imidazol-5-ol
C12 H12 F2 N2 O2
MSZRPLCUVKFQJC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.004 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 150.700α = 90.00
b = 48.500β = 91.86
c = 30.100γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PDB_EXTRACTdata extraction
XDSdata scaling
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-10-04
    Type: Initial release
  • Version 1.1: 2017-10-11
    Type: Database references
  • Version 1.2: 2017-11-29
    Type: Database references