3ZN8

Structural Basis of Signal Sequence Surveillance and Selection by the SRP-SR Complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 2.1 of the entry. See complete history

Literature

Structural Basis of Signal Sequence Surveillance and Selection by the Srp-Sr Complex

Von Loeffelholz, O.Knoops, K.Ariosa, A.Zhang, X.Karuppasamy, M.Huard, K.Schoehn, G.Berger, I.Shan, S.O.Schaffitzel, C.

(2013) Nat.Struct.Mol.Biol. 20: 604

  • DOI: 10.1038/nsmb.2546

  • PubMed Abstract: 
  • Signal-recognition particle (SRP)-dependent targeting of translating ribosomes to membranes is a multistep quality-control process. Ribosomes that are translating weakly hydrophobic signal sequences can be rejected from the targeting reaction even af ...

    Signal-recognition particle (SRP)-dependent targeting of translating ribosomes to membranes is a multistep quality-control process. Ribosomes that are translating weakly hydrophobic signal sequences can be rejected from the targeting reaction even after they are bound to the SRP. Here we show that the early complex, formed by Escherichia coli SRP and its receptor FtsY with ribosomes translating the incorrect cargo EspP, is unstable and rearranges inefficiently into subsequent conformational states, such that FtsY dissociation is favored over successful targeting. The N-terminal extension of EspP is responsible for these defects in the early targeting complex. The cryo-electron microscopy structure of this 'false' early complex with EspP revealed an ordered M domain of SRP protein Ffh making two ribosomal contacts, and the NG domains of Ffh and FtsY forming a distorted, flexible heterodimer. Our results provide a structural basis for SRP-mediated signal-sequence selection during recruitment of the SRP receptor.


    Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble Outstation, Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SIGNAL RECOGNITION PARTICLE PROTEIN
A
294Thermus aquaticusMutation(s): 0 
Gene Names: ffh
Find proteins for O07347 (Thermus aquaticus)
Go to UniProtKB:  O07347
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SIGNAL RECOGNITION PARTICLE RECEPTOR FTSY
D
295Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: ftsY
Find proteins for P10121 (Escherichia coli (strain K12))
Go to UniProtKB:  P10121
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
SIGNAL RECOGNITION PARTICLE 54 KDA PROTEIN
M
125Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)Mutation(s): 0 
Gene Names: srp54
Find proteins for Q97ZE7 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Go to UniProtKB:  Q97ZE7
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
DIPEPTIDYL AMINOPEPTIDASE B
S
14Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: DAP2
EC: 3.4.14.-
Find proteins for P18962 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P18962
Entity ID: 3
MoleculeChainsLengthOrganism
4.5 S RNAG88Escherichia coli
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-06
    Type: Initial release
  • Version 1.1: 2013-04-10
    Type: Database references
  • Version 1.2: 2013-05-01
    Type: Database references
  • Version 1.3: 2013-05-22
    Type: Database references
  • Version 1.4: 2014-02-26
    Type: Other, Refinement description
  • Version 2.0: 2018-03-21
    Type: Advisory, Atomic model, Derived calculations, Structure summary
  • Version 2.1: 2018-10-03
    Type: Data collection