2HQK

Crystal structure of a monomeric cyan fluorescent protein derived from Clavularia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.19 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.149 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Directed evolution of a monomeric, bright and photostable version of Clavularia cyan fluorescent protein: structural characterization and applications in fluorescence imaging.

Ai, H.W.Henderson, J.N.Remington, S.J.Campbell, R.E.

(2006) Biochem J 400: 531-540

  • DOI: 10.1042/BJ20060874
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The arsenal of engineered variants of the GFP [green FP (fluorescent protein)] from Aequorea jellyfish provides researchers with a powerful set of tools for use in biochemical and cell biology research. The recent discovery of diverse FPs in Anthozoa ...

    The arsenal of engineered variants of the GFP [green FP (fluorescent protein)] from Aequorea jellyfish provides researchers with a powerful set of tools for use in biochemical and cell biology research. The recent discovery of diverse FPs in Anthozoa coral species has provided protein engineers with an abundance of alternative progenitor FPs from which improved variants that complement or supersede existing Aequorea GFP variants could be derived. Here, we report the engineering of the first monomeric version of the tetrameric CFP (cyan FP) cFP484 from Clavularia coral. Starting from a designed synthetic gene library with mammalian codon preferences, we identified dimeric cFP484 variants with fluorescent brightness significantly greater than the wild-type protein. Following incorporation of dimer-breaking mutations and extensive directed evolution with selection for blue-shifted emission, high fluorescent brightness and photostability, we arrived at an optimized variant that we have named mTFP1 [monomeric TFP1 (teal FP 1)]. The new mTFP1 is one of the brightest and most photostable FPs reported to date. In addition, the fluorescence is insensitive to physiologically relevant pH changes and the fluorescence lifetime decay is best fitted as a single exponential. The 1.19 A crystal structure (1 A=0.1 nm) of mTFP1 confirms the monomeric structure and reveals an unusually distorted chromophore conformation. As we experimentally demonstrate, the high quantum yield of mTFP1 (0.85) makes it particularly suitable as a replacement for ECFP (enhanced CFP) or Cerulean as a FRET (fluorescence resonance energy transfer) donor to either a yellow or orange FP acceptor.


    Organizational Affiliation

    Department of Chemistry, University of Alberta, Edmonton, AB, Canada T6G 2G2.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyan fluorescent chromoproteinA219Clavularia sp.Mutation(s): 33 
Find proteins for Q9U6Y3 (Clavularia sp.)
Explore Q9U6Y3 
Go to UniProtKB:  Q9U6Y3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PIA
Query on PIA
AL-PEPTIDE LINKINGC14 H15 N3 O4ALA,TYR,GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.19 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.149 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.83α = 90
b = 38.02β = 90.81
c = 61.119γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
HKL-2000data reduction
HKL-2000data scaling
SHELXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-01-02
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2012-02-22
    Changes: Other