Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 60.79 kDa 
• Atom Count: 3,508 
• Modelled Residue Count: 346 
• Deposited Residue Count: 432 
• Unique protein chains: 2
• Unique nucleic acid chains: 1

 1E8O

Core of the Alu domain of the mammalian SRP

• PDB DOI: 10.2210/pdb1E8O/pdb
• NDB: PR0041

• Classification: ALU RIBONUCLEOPROTEIN PARTICLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-09-28 Released: 2000-11-08 
• Deposition Author(s): Weichenrieder, O., Wild, K., Strub, K., Cusack, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.291 
• R-Value Work: 0.245 
• R-Value Observed: 0.245 

Literature

Structure and Assembly of the Alu Domain of the Mammalian Signal Recognition Particle

Weichenrieder, O., Wild, K., Strub, K., Cusack, S.

(2000) Nature 408: 167

• PubMed: 11089964 
• DOI: 10.1038/35041507
• Primary Citation of Related Structures:  
  1E8O, 1E8S


• PubMed Abstract: 
  

The Alu domain of the mammalian signal recognition particle (SRP) comprises the heterodimer of proteins SRP9 and SRP14 bound to the 5' and 3' terminal sequences of SRP RNA. It retards the ribosomal elongation of signal-peptide-containing proteins before their engagement with the translocation machinery in the endoplasmic reticulum. Here we report two crystal structures of the heterodimer SRP9/14 bound either to the 5' domain or to a construct containing both 5' and 3' domains. We present a model of the complete Alu domain that is consistent with extensive biochemical data. SRP9/14 binds strongly to the conserved core of the 5' domain, which forms a U-turn connecting two helical stacks. Reversible docking of the more weakly bound 3' domain might be functionally important in the mechanism of translational regulation. The Alu domain structure is probably conserved in other cytoplasmic ribonucleoprotein particles and retroposition intermediates containing SRP9/14-bound RNAs transcribed from Alu repeats or related elements in genomic DNA.

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Organizational Affiliation: 

European Molecular Laboratory Biology, Grenoble Outstation, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SIGNAL RECOGNITION PARTICLE 9 KDA PROTEIN	A, C	85	Homo sapiens	Mutation(s): 0  Gene Names: SRP9
UniProt & NIH Common Fund Data Resources
Find proteins for P49458 (Homo sapiens) Explore P49458  Go to UniProtKB:  P49458
PHAROS:  P49458

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
SIGNAL RECOGNITION PARTICLE 14 KDA PROTEIN	B, D	106	Homo sapiens	Mutation(s): 0  Gene Names: SRP14
UniProt & NIH Common Fund Data Resources
Find proteins for P37108 (Homo sapiens) Explore P37108  Go to UniProtKB:  P37108
PHAROS:  P37108

Entity ID: 3
Molecule	Chains	Length	Organism	Image
7SL RNA	E	50	Homo sapiens

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	F [auth A], G [auth B], H [auth E]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.291 
• R-Value Work: 0.245 
• R-Value Observed: 0.245 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.448	α = 90
b = 186.621	β = 90
c = 189.824	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-11-08 
Deposition Author(s): Weichenrieder, O., Wild, K., Strub, K., Cusack, S.

Revision History  

• Version 1.0: 2000-11-08
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance