Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 32.84 kDa 
• Atom Count: 2,458 
• Modelled Residue Count: 295 
• Deposited Residue Count: 297 
• Unique protein chains: 1

 1J8M

Signal Recognition Particle conserved GTPase domain from A. ambivalens

• PDB DOI: 10.2210/pdb1J8M/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Acidianus ambivalens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2001-05-22 Released: 2001-06-13 
• Deposition Author(s): Montoya, G., te Kaat, K., Moll, R., Schafer, G., Sinning, I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.270 
• R-Value Work: 0.216 
• R-Value Observed: 0.219 

Literature

The crystal structure of the conserved GTPase of SRP54 from the archaeon Acidianus ambivalens and its comparison with related structures suggests a model for the SRP-SRP receptor complex.

Montoya, G., Kaat, K., Moll, R., Schafer, G., Sinning, I.

(2000) Structure 8: 515-525

• PubMed: 10801496 
• DOI: 10.1016/s0969-2126(00)00131-3
• Primary Citation of Related Structures:  
  1J8M, 1J8Y


• PubMed Abstract: 
  

Protein targeting to the endoplasmic reticulum in eukaryotes and to the cell membrane in prokaryotes is mediated by the signal recognition particle (SRP) and its receptor (SR). Both contain conserved GTPase domains in the signal-peptide-binding proteins (SRP54 and Ffh) and the SR proteins (SRalpha and FtsY). These GTPases are involved in the regulation of protein targeting. Most studies so far have focussed on the SRP machinery of mammals and bacteria, leaving the SRP system of archaea less well understood.

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Related Citations: 

• Crystallization and Preliminary X-ray Diffraction Studies on the Conserved GTPase Domain of the Signal Recognition Particle from Acidianus ambivalens
  Montoya, G., te Kaat, K., Moll, R., Schafer, G., Sinning, I.
  (1999) Acta Crystallogr D Biol Crystallogr 55: 1949

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Organizational Affiliation: 

European Molecular Biology Laboratory, Structural Biology Programme, Heidelberg, D-69017, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SIGNAL RECOGNITION 54 KDA PROTEIN	A [auth F]	297	Acidianus ambivalens	Mutation(s): 0  Gene Names: srp54, ffh
UniProt
Find proteins for P70722 (Acidianus ambivalens) Explore P70722  Go to UniProtKB:  P70722

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.270 
• R-Value Work: 0.216 
• R-Value Observed: 0.219 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.866	α = 90
b = 128.02	β = 90
c = 72.004	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-06-13 
Deposition Author(s): Montoya, G., te Kaat, K., Moll, R., Schafer, G., Sinning, I.

Revision History  

• Version 1.0: 2001-06-13
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance