2A50

fluorescent protein asFP595, wt, off-state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and mechanism of the reversible photoswitch of a fluorescent protein

Andresen, M.Wahl, M.C.Stiel, A.C.Graeter, F.Schaefer, L.Trowitzsch, S.Weber, G.Eggeling, C.Grubmueller, H.Hell, S.W.Jakobs, S.

(2005) Proc Natl Acad Sci U S A 102: 13070-13074

  • DOI: 10.1073/pnas.0502772102
  • Primary Citation of Related Structures:  
    2A50, 2A52, 2A53, 2A54, 2A56

  • PubMed Abstract: 
  • Proteins that can be reversibly photoswitched between a fluorescent and a nonfluorescent state bear enormous potential in diverse fields, such as data storage, in vivo protein tracking, and subdiffraction resolution light microscopy. However, these proteins could hitherto not live up to their full potential because the molecular switching mechanism is not resolved ...

    Proteins that can be reversibly photoswitched between a fluorescent and a nonfluorescent state bear enormous potential in diverse fields, such as data storage, in vivo protein tracking, and subdiffraction resolution light microscopy. However, these proteins could hitherto not live up to their full potential because the molecular switching mechanism is not resolved. Here, we clarify the molecular photoswitching mechanism of asFP595, a green fluorescent protein (GFP)-like protein that can be transferred from a nonfluorescent "off" to a fluorescent "on" state and back again, by green and blue light, respectively. To this end, we establish reversible photoswitching of fluorescence in whole protein crystals and show that the switching kinetics in the crystal is identical with that in solution. Subsequent x-ray analysis demonstrated that upon the absorption of a green photon, the chromophore isomerizes from a trans (off) to a cis (on) state. Molecular dynamics calculations suggest that isomerization occurs through a bottom hula twist mechanism with concomitant rotation of both bonds of the chromophoric methine ring bridge. This insight into the switching mechanism should facilitate the targeted design of photoswitchable proteins. Reversible photoswitching of the protein chromophore system within intact crystals also constitutes a step toward the use of fluorescent proteins in three-dimensional data recording.


    Organizational Affiliation

    Department of NanoBiophotonics, Theoretical and Computational Biophysics, and X-Ray Crystallography, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GFP-like non-fluorescent chromoprotein FP595 chain 1A, C73Anemonia sulcataMutation(s): 0 
UniProt
Find proteins for Q9GZ28 (Anemonia sulcata)
Explore Q9GZ28 
Go to UniProtKB:  Q9GZ28
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GFP-like non-fluorescent chromoprotein FP595 chain 2B, D168Anemonia sulcataMutation(s): 1 
UniProt
Find proteins for Q9GZ28 (Anemonia sulcata)
Explore Q9GZ28 
Go to UniProtKB:  Q9GZ28
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NRQ
Query on NRQ
B, DL-PEPTIDE LINKINGC16 H17 N3 O4 SMET, TYR, GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.174α = 90
b = 126.5β = 90
c = 94.108γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-16
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance