5O8C

Composite structure of rsEGFP2 1ps following 400nm-laser irradiation of the off-state.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Chromophore twisting in the excited state of a photoswitchable fluorescent protein captured by time-resolved serial femtosecond crystallography.

Coquelle, N.Sliwa, M.Woodhouse, J.Schiro, G.Adam, V.Aquila, A.Barends, T.R.M.Boutet, S.Byrdin, M.Carbajo, S.De la Mora, E.Doak, R.B.Feliks, M.Fieschi, F.Foucar, L.Guillon, V.Hilpert, M.Hunter, M.S.Jakobs, S.Koglin, J.E.Kovacsova, G.Lane, T.J.Levy, B.Liang, M.Nass, K.Ridard, J.Robinson, J.S.Roome, C.M.Ruckebusch, C.Seaberg, M.Thepaut, M.Cammarata, M.Demachy, I.Field, M.Shoeman, R.L.Bourgeois, D.Colletier, J.P.Schlichting, I.Weik, M.

(2018) Nat Chem 10: 31-37

  • DOI: https://doi.org/10.1038/nchem.2853
  • Primary Citation of Related Structures:  
    5O89, 5O8A, 5O8B, 5O8C

  • PubMed Abstract: 

    Chromophores absorb light in photosensitive proteins and thereby initiate fundamental biological processes such as photosynthesis, vision and biofluorescence. An important goal in their understanding is the provision of detailed structural descriptions of the ultrafast photochemical events that they undergo, in particular of the excited states that connect chemistry to biological function. Here we report on the structures of two excited states in the reversibly photoswitchable fluorescent protein rsEGFP2. We populated the states through femtosecond illumination of rsEGFP2 in its non-fluorescent off state and observed their build-up (within less than one picosecond) and decay (on the several picosecond timescale). Using an X-ray free-electron laser, we performed picosecond time-resolved crystallography and show that the hydroxybenzylidene imidazolinone chromophore in one of the excited states assumes a near-canonical twisted configuration halfway between the trans and cis isomers. This is in line with excited-state quantum mechanics/molecular mechanics and classical molecular dynamics simulations. Our new understanding of the structure around the twisted chromophore enabled the design of a mutant that displays a twofold increase in its off-to-on photoswitching quantum yield.


  • Organizational Affiliation

    Institut de Biologie Structurale, Univ. Grenoble Alpes, CEA, CNRS, F-38044 Grenoble, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Green fluorescent protein246Aequorea victoriaMutation(s): 6 
Gene Names: GFP
UniProt
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42212
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PIA
Query on PIA
A
L-PEPTIDE LINKINGC14 H15 N3 O4ALA, TYR, GLY
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.53α = 90
b = 62.85β = 90
c = 71.76γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
CrystFELdata reduction
CrystFELdata scaling
PHASERphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2017-12-27
    Changes: Database references
  • Version 1.2: 2018-01-24
    Changes: Data collection
  • Version 1.3: 2018-11-14
    Changes: Data collection
  • Version 1.4: 2023-12-13
    Changes: Advisory, Data collection, Database references, Derived calculations
  • Version 1.5: 2024-01-17
    Changes: Refinement description