3ZTF

X-ray Structure of the Cyan Fluorescent Protein mTurquoise2 (K206A mutant)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.132 
  • R-Value Observed: 0.134 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history. 


Literature

Structure-Guided Evolution of Cyan Fluorescent Proteins Towards a Quantum Yield of 93%

Goedhart, J., von Stetten, D., Noirclerc-Savoye, M., Lelimousin, M., Joosen, L., Hink, M.A., van Weeren, L., Gadella, T.W.J., Royant, A.

(2012) Nat Commun 3: 751

  • DOI: 10.1038/ncomms1738
  • Primary Citation of Related Structures:  
    3ZTF, 2YDZ, 2YE0

  • PubMed Abstract: 

    • Cyan variants of green fluorescent protein are widely used as donors in Förster resonance energy transfer experiments. The popular, but modestly bright, Enhanced Cyan Fluorescent Protein (ECFP) was sequentially improved into the brighter variants Sup ...

    Cyan variants of green fluorescent protein are widely used as donors in Förster resonance energy transfer experiments. The popular, but modestly bright, Enhanced Cyan Fluorescent Protein (ECFP) was sequentially improved into the brighter variants Super Cyan Fluorescent Protein 3A (SCFP3A) and mTurquoise, the latter exhibiting a high-fluorescence quantum yield and a long mono-exponential fluorescence lifetime. Here we combine X-ray crystallography and excited-state calculations to rationalize these stepwise improvements. The enhancement originates from stabilization of the seventh β-strand and the strengthening of the sole chromophore-stabilizing hydrogen bond. The structural analysis highlighted one suboptimal internal residue, which was subjected to saturation mutagenesis combined with fluorescence lifetime-based screening. This resulted in mTurquoise2, a brighter variant with faster maturation, high photostability, longer mono-exponential lifetime and the highest quantum yield measured for a monomeric fluorescent protein. Together, these properties make mTurquoise2 the preferable cyan variant of green fluorescent protein for long-term imaging and as donor for Förster resonance energy transfer to a yellow fluorescent protein.

    Related Citations: 
    • Bright Cyan Fluorescent Protein Variants Identified by Fluorescence Lifetime Screening.
      Goedhart, J., van Weeren, L., Hink, M.A., Vischer, N.O.E., Jalink, K., Gadella, T.W.J.J.
      (2010) Nat Methods 7: 137
    Organizational Affiliation: 

    Swammerdam Institute for Life Sciences, Section of Molecular Cytology, van Leeuwenhoek Centre for Advanced Microscopy, University of Amsterdam, 1098 XH Amsterdam, The Netherlands.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GREEN FLUORESCENT PROTEINA243Aequorea victoriaMutation(s): 9 
Gene Names: GFP
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SWG
Query on SWG		AL-PEPTIDE LINKINGC16 H16 N4 O4SER, TRP, GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.132 
  • R-Value Observed: 0.134 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.01α = 90
b = 62.549β = 90
c = 70.356γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
REFMACphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-21
    Type: Initial release
  • Version 1.1: 2012-04-04
    Changes: Other
  • Version 1.2: 2017-09-27
    Changes: Data collection
  • Version 1.3: 2017-12-20
    Changes: Database references
  • Version 1.4: 2019-10-23
    Changes: Data collection, Database references, Derived calculations, Other