3KTW

Crystal structure of the SRP19/S-domain SRP RNA complex of Sulfolobus solfataricus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.242 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into the assembly of the human and archaeal signal recognition particles.

Wild, K.Bange, G.Bozkurt, G.Segnitz, B.Hendricks, A.Sinning, I.

(2010) Acta Crystallogr D Biol Crystallogr 66: 295-303

  • DOI: 10.1107/S0907444910000879
  • Primary Citation of Related Structures:  
    3KTV, 3KTW

  • PubMed Abstract: 
  • The signal recognition particle (SRP) is a conserved ribonucleoprotein (RNP) complex that co-translationally targets membrane and secretory proteins to membranes. The assembly of the particle depends on the proper folding of the SRP RNA, which in mammalia and archaea involves an induced-fit mechanism within helices 6 and 8 in the S domain of SRP ...

    The signal recognition particle (SRP) is a conserved ribonucleoprotein (RNP) complex that co-translationally targets membrane and secretory proteins to membranes. The assembly of the particle depends on the proper folding of the SRP RNA, which in mammalia and archaea involves an induced-fit mechanism within helices 6 and 8 in the S domain of SRP. The two helices are juxtaposed and clamped together upon binding of the SRP19 protein to their apices. In the current assembly paradigm, archaeal SRP19 causes the asymmetric loop of helix 8 to bulge out and expose the binding platform for the key player SRP54. Based on a heterologous archaeal SRP19-human SRP RNA structure, mammalian SRP19 was thought not to be able to induce this change, thus explaining the different requirements of SRP19 for SRP54 recruitment. In contrast, the crystal structures of a crenarchaeal and the all-human SRP19-SRP RNA binary complexes presented here show that the asymmetric loop is bulged out in both binary complexes. Differences in SRP assembly between mammalia and archaea are therefore independent of SRP19 and are based on differences in SRP RNA itself. A new SRP-assembly scheme is presented.


    Organizational Affiliation

    Heidelberg University Biochemistry Center (BZH), University of Heidelberg, INF328, D-69120 Heidelberg, Germany. klemens.wild@bzh.uni-heidelberg.de



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Signal recognition particle 19 kDa proteinC [auth A], D [auth B]109Saccharolobus solfataricusMutation(s): 0 
Gene Names: srp19SSO0165
Find proteins for Q980W2 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q980W2 
Go to UniProtKB:  Q980W2
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
SRP RNAA [auth C], B [auth D]96Saccharolobus solfataricus
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.242 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.307α = 90
b = 79.338β = 101.99
c = 114.067γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
MxCuBEdata collection
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance