Structure of the E. coli SRP receptor FtsY

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Lipids Trigger a Conformational Switch that Regulates Signal Recognition Particle (Srp)-Mediated Protein Targeting.

Stjepanovic, G.Kapp, K.Bange, G.Graf, C.Parlitz, R.Wild, K.Mayer, M.P.Sinning, I.

(2011) J Biol Chem 286: 23489

  • DOI: https://doi.org/10.1074/jbc.M110.212340
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Co-translational protein targeting to the membrane is mediated by the signal recognition particle and its receptor (FtsY). Their homologous GTPase domains interact at the membrane and form a heterodimer in which both GTPases are activated. The prerequisite for protein targeting is the interaction of FtsY with phospholipids. However, the mechanism of FtsY regulation by phospholipids remained unclear. Here we show that the N terminus of FtsY (A domain) is natively unfolded in solution and define the complete membrane-targeting sequence. We show that the membrane-targeting sequence is highly dynamic in solution, independent of nucleotides and directly responds to the density of anionic phospholipids by a random coil-helix transition. This conformational switch is essential for tethering FtsY to membranes and activates the GTPase for its subsequent interaction with the signal recognition particle. Our results underline the dynamics of lipid-protein interactions and their importance in the regulation of protein targeting and translocation across biological membranes.

  • Organizational Affiliation

    Biochemie Zentrum (BZH), University of Heidelberg, INF 328, 69120 Heidelberg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CELL DIVISION PROTEIN FTSY503Escherichia coli K-12Mutation(s): 0 
Find proteins for P10121 (Escherichia coli (strain K12))
Explore P10121 
Go to UniProtKB:  P10121
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10121
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.358α = 90
b = 108.412β = 90
c = 31.902γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-05-18
    Type: Initial release
  • Version 1.1: 2011-06-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description