Photoexcited structure of the plant photoreceptor domain, phy3 LOV2

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history


Photoexcited structure of a plant photoreceptor domain reveals a light-driven molecular switch.

Crosson, S.Moffat, K.

(2002) Plant Cell 14: 1067-1075

  • DOI: https://doi.org/10.1105/tpc.010475
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The phototropins are flavoprotein kinases that control phototropic bending, light-induced chloroplast movement, and stomatal opening in plants. Two flavin mononucleotide binding light, oxygen, or voltage (LOV) domains are the sites for initial photochemistry in these blue light photoreceptors. We have determined the steady state, photoexcited crystal structure of a flavin-bound LOV domain. The structure reveals a unique photochemical switch in the flavin binding pocket in which the absorption of light drives the formation of a reversible covalent bond between a highly conserved Cys residue and the flavin cofactor. This provides a molecular picture of a cysteinyl-flavin covalent adduct, the presumed signaling species that leads to phototropin kinase activation and subsequent signal transduction. We identify closely related LOV domains in two eubacterial proteins that suggests the light-induced conformational change evident in this structure is an ancient biomolecular response to light, arising before the appearance of plants.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
104Adiantum capillus-venerisMutation(s): 0 
Gene Names: phy3
Find proteins for Q9ZWQ6 (Adiantum capillus-veneris)
Explore Q9ZWQ6 
Go to UniProtKB:  Q9ZWQ6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ZWQ6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.843α = 93.14
b = 54.771β = 93.79
c = 70.963γ = 90.4
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-06-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description