1AQZ

CRYSTAL STRUCTURE OF A HIGHLY SPECIFIC ASPERGILLUS RIBOTOXIN, RESTRICTOCIN

• PDB DOI: https://doi.org/10.2210/pdb1AQZ/pdb

• Classification: RIBOTOXIN
• Organism(s): Aspergillus restrictus
• Mutation(s): No 


• Deposited: 1997-08-04 Released: 1997-11-12 
• Deposition Author(s): Yang, X., Moffat, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.177 
• R-Value Work: 0.237 
• R-Value Observed: 0.237 

Literature

Insights into specificity of cleavage and mechanism of cell entry from the crystal structure of the highly specific Aspergillus ribotoxin, restrictocin.

Yang, X., Moffat, K.

(1996) Structure 4: 837-852

• PubMed: 8805570 
• DOI: https://doi.org/10.1016/s0969-2126(96)00090-1
• Primary Citation of Related Structures:  
  1AQZ


• PubMed Abstract: 
  

  Restriction, a highly specific ribotoxin made by the fungus Aspergillus restrictus, cleaves a single phosphodiester bond in the 28S RNA of eukaryotic ribosomes, inhibiting protein synthesis. The sequence around this cleavage site is a binding site for elongation factors, and is conserved in all cytoplasmic ribosomes. The catalytic mechanism of restrictocin and the reasons for its high substrate specificity are unknown. No structure has been determined for any other member of the Aspergillus ribotoxin family.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 34.06 kDa 
• Atom Count: 2,489 
• Modelled Residue Count: 285 
• Deposited Residue Count: 298 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RESTRICTOCIN	A, B	149	Aspergillus restrictus	Mutation(s): 0  EC: 3.1.27
UniProt
Find proteins for P67876 (Aspergillus restrictus) Explore P67876  Go to UniProtKB:  P67876

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	C [auth A], D [auth A], E [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.177 
• R-Value Work: 0.237 
• R-Value Observed: 0.237 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.24	α = 90
b = 82.16	β = 100.5
c = 38.04	γ = 90

Software Package:

Software Name	Purpose
LAUEVIEW	data collection
LAUEVIEW	data reduction
PHASES	phasing
X-PLOR	model building
X-PLOR	refinement
LAUEVIEW	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-11-12 
Deposition Author(s): Yang, X., Moffat, K.

Revision History  

• Version 1.0: 1997-11-12
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance