Crystal Structure of the TPR Domain of Arabidopsis FLU (FLU-TPR)

Experimental Data Snapshot

  • Resolution: 1.45 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.142 

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The Non-canonical Tetratricopeptide Repeat (TPR) Domain of Fluorescent (FLU) Mediates Complex Formation with Glutamyl-tRNA Reductase.

Zhang, M.Zhang, F.Fang, Y.Chen, X.Chen, Y.Zhang, W.Dai, H.E.Lin, R.Liu, L.

(2015) J Biol Chem 290: 17559-17565

  • DOI: https://doi.org/10.1074/jbc.M115.662981
  • Primary Citation of Related Structures:  
    4YVO, 4YVQ

  • PubMed Abstract: 

    The tetratricopeptide repeat (TPR)-containing protein FLU is a negative regulator of chlorophyll biosynthesis in plants. It directly interacts through its TPR domain with glutamyl-tRNA reductase (GluTR), the rate-limiting enzyme in the formation of δ-aminolevulinic acid (ALA). Delineation of how FLU binds to GluTR is important for understanding the molecular basis for FLU-mediated repression of synthesis of ALA, the universal tetrapyrrole precursor. Here, we characterize the FLU-GluTR interaction by solving the crystal structures of the uncomplexed TPR domain of FLU (FLU(TPR)) at 1.45-Å resolution and the complex of the dimeric domain of GluTR bound to FLU(TPR) at 2.4-Å resolution. Three non-canonical TPR motifs of each FLU(TPR) form a concave surface and clamp the helix bundle in the C-terminal dimeric domain of GluTR. We demonstrate that a 2:2 FLU(TPR)-GluTR complex is the functional unit for FLU-mediated GluTR regulation and suggest that the formation of the FLU-GluTR complex prevents glutamyl-tRNA, the GluTR substrate, from binding with this enzyme. These results also provide insights into the spatial regulation of ALA synthesis by the membrane-located FLU protein.

  • Organizational Affiliation

    From the School of Life Sciences, Anhui University, Hefei, Anhui 230601.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein FLUORESCENT IN BLUE LIGHT, chloroplastic165Arabidopsis thalianaMutation(s): 0 
Gene Names: FLUAt3g14110MAG2.7
Find proteins for Q940U6 (Arabidopsis thaliana)
Explore Q940U6 
Go to UniProtKB:  Q940U6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ940U6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.45 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.140 
  • R-Value Observed: 0.142 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.193α = 90
b = 60.193β = 90
c = 67.489γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-10
    Type: Initial release
  • Version 1.1: 2015-07-22
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy