6GPV

Crystal structure of blue-light irradiated miniSOG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Tailing miniSOG: structural bases of the complex photophysics of a flavin-binding singlet oxygen photosensitizing protein.

Torra, J.Lafaye, C.Signor, L.Aumonier, S.Flors, C.Shu, X.Nonell, S.Gotthard, G.Royant, A.

(2019) Sci Rep 9: 2428-2428

  • DOI: https://doi.org/10.1038/s41598-019-38955-3
  • Primary Citation of Related Structures:  
    6GPU, 6GPV

  • PubMed Abstract: 

    miniSOG is the first flavin-binding protein that has been developed with the specific aim of serving as a genetically-encodable light-induced source of singlet oxygen ( 1 O 2 ). We have determined its 1.17 Å resolution structure, which has allowed us to investigate its mechanism of photosensitization using an integrated approach combining spectroscopic and structural methods. Our results provide a structural framework to explain the ability of miniSOG to produce 1 O 2 as a competition between oxygen- and protein quenching of its triplet state. In addition, a third excited-state decay pathway has been identified that is pivotal for the performance of miniSOG as 1 O 2 photosensitizer, namely the photo-induced transformation of flavin mononucleotide (FMN) into lumichrome, which increases the accessibility of oxygen to the flavin FMN chromophore and makes protein quenching less favourable. The combination of the two effects explains the increase in the 1 O 2 quantum yield by one order of magnitude upon exposure to blue light. Besides, we have identified several surface electron-rich residues that are progressively photo-oxidized, further contributing to facilitate the production of 1 O 2 . Our results help reconcile the apparent poor level of 1 O 2 generation by miniSOG and its excellent performance in correlative light and electron microscopy experiments.


  • Organizational Affiliation

    Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, Barcelona, 08017, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phototropin-2115Arabidopsis thalianaMutation(s): 1 
Gene Names: PHOT2CAV1KIN7NPL1At5g58140K21L19.6
EC: 2.7.11.1
UniProt
Find proteins for P93025 (Arabidopsis thaliana)
Explore P93025 
Go to UniProtKB:  P93025
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP93025
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  3 Unique
IDChains TypeFormula2D DiagramParent
F7Q
Query on F7Q
A
L-PEPTIDE LINKINGC9 H11 N O5TYR
HOO
Query on HOO
A
L-PEPTIDE LINKINGC6 H7 N3 O4HIS
OHI
Query on OHI
A
L-PEPTIDE LINKINGC6 H7 N3 O3HIS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.5α = 90
b = 40.5β = 90
c = 133.76γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
REFMACrefinement
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-11-JSV5-0009

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-03-06
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description