The crystal structure of cpFtsY from Arabidopsis thaliana

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 

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The structure of the chloroplast signal recognition particle (SRP) receptor reveals mechanistic details of SRP GTPase activation and a conserved membrane targeting site

Stengel, K.F.Holdermann, I.Wild, K.Sinning, I.

(2007) FEBS Lett 581: 5671-5676

  • DOI: https://doi.org/10.1016/j.febslet.2007.11.024
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Two GTPases in the signal recognition particle and its receptor (FtsY) regulate protein targeting to the membrane by formation of a heterodimeric complex. The activation of both GTPases in the complex is essential for protein translocation. We present the crystal structure of chloroplast FtsY (cpFtsY) at 1.75 A resolution. The comparison with FtsY structures in different nucleotide bound states shows structural changes relevant for GTPase activation and provides insights in how cpFtsY is pre-organized for complex formation with cpSRP54. The structure contains an amino-terminal amphipathic helix similar to the membrane targeting sequence of Escherichia coli FtsY. In cpFtsY this motif is extended, which might be responsible for the enhanced attachment of the protein to the thylakoid membrane.

  • Organizational Affiliation

    Biochemie-Zentrum der Universität Heidelberg, INF 328, D-69120, Heidelberg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloroplast SRP receptor homolog, alpha subunit CPFTSY302Arabidopsis thalianaMutation(s): 0 
Find proteins for O80842 (Arabidopsis thaliana)
Explore O80842 
Go to UniProtKB:  O80842
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO80842
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MLI

Download Ideal Coordinates CCD File 
C3 H2 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.897α = 90
b = 84.15β = 90
c = 99.374γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description