2Y0G

X-ray structure of Enhanced Green Fluorescent Protein (EGFP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.136 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Stabilizing Role of Glutamic Acid 222 in the Structure of Enhanced Green Fluorescent Protein.

Royant, A.Noirclerc-Savoye, M.

(2011) J.Struct.Biol. 174: 385

  • DOI: 10.1016/j.jsb.2011.02.004

  • PubMed Abstract: 
  • Enhanced Green Fluorescent Protein (EGFP) is a variant of wild-type Green Fluorescent Protein from the jellyfish Aequorea victoria, whose mutations S65T and F64L increase brightness and folding efficiency. EGFP is extensively used in cell biology and ...

    Enhanced Green Fluorescent Protein (EGFP) is a variant of wild-type Green Fluorescent Protein from the jellyfish Aequorea victoria, whose mutations S65T and F64L increase brightness and folding efficiency. EGFP is extensively used in cell biology and biochemistry as a colocalization or expression reporter. Surprisingly, the structure of this very popular protein has not been determined yet. We report here its crystallographic structure at 1.5Å resolution which shows significant differences in the vicinity of residue 64 and of the chromophore. In particular, two conformations are observed for the key residue glutamic acid 222, in apparent contradiction with the single fluorescence lifetime of the protein. We then show that X-ray induced decarboxylation of Glu222 during diffraction data collection results in the disruption of a hydrogen-bond network near the chromophore. Using single-crystal microspectrophotometry, we demonstrate that this correlates with a significant loss of the fluorescence properties. We thus propose a mechanism of bleaching of the protein at low temperature. Taken together, these two sets of results highlight the stabilizing role of Glu222 to the chromophore cavity of EGFP.


    Organizational Affiliation

    CNRS, Institut de Biologie Structurale Jean-Pierre Ebel, 41 rue Jules Horowitz, 38027 Grenoble, France. antoine.royant@ibs.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GREEN FLUORESCENT PROTEIN
A
252Aequorea victoriaMutation(s): 2 
Gene Names: GFP
Find proteins for P42212 (Aequorea victoria)
Go to UniProtKB:  P42212
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CRO
Query on CRO
A
L-PEPTIDE LINKINGC15 H17 N3 O5THR, TYR, GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.136 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.047α = 90.00
b = 62.183β = 90.00
c = 70.018γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-04-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-10-23
    Type: Data collection, Database references, Derived calculations, Other