Arabidopsis UV-B photoreceptor UVR8 mutant G101S W285A

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.159 

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


A constitutively monomeric UVR8 photoreceptor confers enhanced UV-B photomorphogenesis.

Podolec, R.Lau, K.Wagnon, T.B.Hothorn, M.Ulm, R.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: https://doi.org/10.1073/pnas.2017284118
  • Primary Citation of Related Structures:  
    6XZL, 6XZM, 6XZN

  • PubMed Abstract: 

    The plant ultraviolet-B (UV-B) photoreceptor UVR8 plays an important role in UV-B acclimation and survival. UV-B absorption by homodimeric UVR8 induces its monomerization and interaction with the E3 ubiquitin ligase COP1, leading ultimately to gene expression changes. UVR8 is inactivated through redimerization, facilitated by RUP1 and RUP2. Here, we describe a semidominant, hyperactive allele, namely uvr8-17D , that harbors a glycine-101 to serine mutation. UVR8 G101S overexpression led to weak constitutive photomorphogenesis and extreme UV-B responsiveness. UVR8 G101S was observed to be predominantly monomeric in vivo and, once activated by UV-B, was not efficiently inactivated. Analysis of a UVR8 crystal structure containing the G101S mutation revealed the distortion of a loop region normally involved in stabilization of the UVR8 homodimer. Plants expressing a UVR8 variant combining G101S with the previously described W285A mutation exhibited robust constitutive photomorphogenesis. This work provides further insight into UVR8 activation and inactivation mechanisms and describes a genetic tool for the manipulation of photomorphogenic responses.

  • Organizational Affiliation

    Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, CH-1211 Geneva 4, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ultraviolet-B receptor UVR8
A, B
373Arabidopsis thalianaMutation(s): 2 
Gene Names: UVR8At5g63860MGI19.7
Find proteins for Q9FN03 (Arabidopsis thaliana)
Explore Q9FN03 
Go to UniProtKB:  Q9FN03
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9FN03
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.159 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.541α = 90
b = 99.123β = 90
c = 132.727γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland31003A_175774
European Research Council (ERC)Switzerland310539

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-13
    Type: Initial release
  • Version 1.1: 2021-07-28
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description