Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 86.50 kDa 
• Atom Count: 3814 
• Modelled Residue Count: 460 
• Deposited Residue Count: 746 
• Unique protein chains: 1

4NOX

Structure of the nine-bladed beta-propeller of eIF3b

• PDB DOI: 10.2210/pdb4NOX/pdb

• Classification: TRANSLATION
• Organism(s): Chaetomium thermophilum var. thermophilum DSM 1495
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-11-20 Released: 2014-09-17 
• Deposition Author(s): Liu, Y., Neumann, P., Kuhle, B., Monecke, T., Ficner, R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.72 Å
• R-Value Free: 0.230 
• R-Value Work: 0.206 
• R-Value Observed: 0.207 

Literature

Translation initiation factor eIF3b contains a nine-bladed beta-propeller and interacts with the 40S ribosomal subunit

Liu, Y., Neumann, P., Kuhle, B., Monecke, T., Schell, S., Chari, A., Ficner, R.

(2014) Structure 22: 923-930

• PubMed: 24768115 
• DOI: 10.1016/j.str.2014.03.010
• Primary Citation of Related Structures:  
  4NOX


• PubMed Abstract: 
  

The multisubunit eukaryotic translation initiation factor 3, among which the subunit b (eIF3b) is a major scaffold protein, plays essential roles in protein synthesis. Here, we report the crystal structure of the WD40 domain of Chaetomium thermophilum eIF3b, revealing a nine-bladed β-propeller fold. Sequence analysis indicates that this propeller architecture is common to all eIF3b orthologs. Revisiting the cryoelectron microscopy (cryo-EM) map of the 43S preinitiation complex suggests an interaction of the eIF3b with the 40S ribosomal subunit involving the ribosomal protein S9e and the 18S rRNA. This model is strongly supported by the direct binding of eIF3b to 40S ribosomes and to the isolated ribosomal protein rpS9e in vitro.

---

Organizational Affiliation: 

Department of Molecular Structural Biology, Institute for Microbiology and Genetics, GZMB, Georg-August-University Göttingen, 37077 Göttingen, Germany. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Eukaryotic translation initiation factor 3 subunit B	A	746	Chaetomium thermophilum var. thermophilum DSM 1495	Mutation(s): 0  Gene Names: PRT1, CTHT_0000230
UniProt
Find proteins for G0RXS6 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)) Explore G0RXS6  Go to UniProtKB:  G0RXS6

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	B [auth A], C [auth A], D [auth A], E [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.72 Å
• R-Value Free: 0.230 
• R-Value Work: 0.206 
• R-Value Observed: 0.207 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 108.38	α = 90
b = 108.38	β = 90
c = 172.18	γ = 90

Software Package:

Software Name	Purpose
XSCALE	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-11-20 
• Released Date: 2014-09-17 
Deposition Author(s): Liu, Y., Neumann, P., Kuhle, B., Monecke, T., Ficner, R.

Revision History  

• Version 1.0: 2014-09-17
  Type: Initial release
  
• Version 1.1: 2014-10-01
  Changes: Structure summary