2A54

fluorescent protein asFP595, A143S, on-state, 1min irradiation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.176 

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.Usa 102: 13070-13074

  • DOI: 10.1073/pnas.0502772102
  • Primary Citation of Related Structures:  

  • 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 p ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GFP-like non-fluorescent chromoprotein FP595 chain 1
A, C
73Anemonia sulcataMutation(s): 0 
Find proteins for Q9GZ28 (Anemonia sulcata)
Go to UniProtKB:  Q9GZ28
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GFP-like non-fluorescent chromoprotein FP595 chain 2
B, D
170Anemonia sulcataMutation(s): 1 
Find proteins for Q9GZ28 (Anemonia sulcata)
Go to UniProtKB:  Q9GZ28
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NRQ
Query on NRQ
B, D
L-PEPTIDE LINKINGC16 H17 N3 O4 SMET,TYR,GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.176 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 76.539α = 90.00
b = 125.946β = 90.00
c = 93.919γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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