Crystal structure of the complete core of archaeal SRP and implications for inter-domain communication

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • R-Value Free: 0.383 
  • R-Value Work: 0.313 

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Crystal structure of the complete core of archaeal signal recognition particle and implications for interdomain communication

Rosendal, K.R.Wild, K.Montoya, G.Sinning, I.

(2003) Proc Natl Acad Sci U S A 100: 14701-14706

  • DOI: https://doi.org/10.1073/pnas.2436132100
  • Primary Citation of Related Structures:  
    1QZW, 1QZX

  • PubMed Abstract: 

    Targeting of secretory and membrane proteins by the signal recognition particle (SRP) is evolutionarily conserved, and the multidomain protein SRP54 acts as the key player in SRP-mediated protein transport. Binding of a signal peptide to SRP54 at the ribosome is coordinated with GTP binding and subsequent complex formation with the SRP receptor. Because these functions are localized to distinct domains of SRP54, communication between them is essential. We report the crystal structures of SRP54 from the Archaeon Sulfolobus solfataricus with and without its cognate SRP RNA binding site (helix 8) at 4-A resolution. The two structures show the flexibility of the SRP core and the position of SRP54 relative to the RNA. A long linker helix connects the GTPase (G domain) with the signal peptide binding (M) domain, and a hydrophobic contact between the N and M domains relates the signal peptide binding site to the G domain. Hinge regions are identified in the linker between the G and M domains (292-LGMGD) and in the N-terminal part of the M domain, which allow for structural rearrangements within SRP54 upon signal peptide binding at the ribosome.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Signal recognition 54 kDa protein
A, B
440Saccharolobus solfataricusMutation(s): 0 
Gene Names: SRP54
Find proteins for Q97ZE7 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97ZE7 
Go to UniProtKB:  Q97ZE7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97ZE7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • R-Value Free: 0.383 
  • R-Value Work: 0.313 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 197.906α = 90
b = 197.906β = 90
c = 64.305γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-18
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description