Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 9437.82 
• Atom Count: 630 
• Residue Count: 78 
• Unique protein chains: 1

1TIF

TRANSLATION INITIATION FACTOR 3 N-TERMINAL DOMAIN

• DOI: 10.2210/pdb1TIF/pdb

• Classification: RIBOSOME BINDING FACTOR
• Organism(s): Geobacillus stearothermophilus
• Expression System: Escherichia coli


• Deposited: 1995-08-16 Released: 1995-12-07 
• Deposition Author(s): Biou, V., Shu, F., Ramakrishnan, V.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.233 
• R-Value Work: 0.192 

Literature

X-ray crystallography shows that translational initiation factor IF3 consists of two compact alpha/beta domains linked by an alpha-helix.

Biou, V., Shu, F., Ramakrishnan, V.

(1995) EMBO J. 14: 4056-4064

• PubMed: 7664745 
• Primary Citation of Related Structures:  
  1TIG


• PubMed Abstract: 
  

The structures of the two domains of translational initiation factor IF3 from Bacillus stearothermophilus have been solved by X-ray crystallography using single wavelength anomalous scattering and multiwavelength anomalous diffraction. Each of the two domains has an alpha/beta topology, with an exposed beta-sheet that is reminiscent of several ribosomal and other RNA binding proteins. An alpha-helix that protrudes out from the body of the N-terminal domain towards the C-terminal domain suggests that IF3 consists of two RNA binding domains connected by an alpha-helix and that it may bridge two regions of the ribosome. This represents the first high resolution structural information on a translational initiation factor.

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Related Citations: 

• Prokaryotic Translation Initiation Factor If3 is an Elongated Protein Consisting of Two Crystallizable Domains
  Kycia, J.H.,Biou, V.,Shu, F.,Gerchman, S.E.,Graziano, V.,Ramakrishnan, V.
  (1995) Biochemistry 34: 6183




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Organizational Affiliation: 

Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
TRANSLATION INITIATION FACTOR 3	A	78	Geobacillus stearothermophilus	Mutation(s): 0  Gene Names: infC
Find proteins for P03000 (Geobacillus stearothermophilus) Go to UniProtKB:  P03000

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
PBM	A	TRIMETHYL LEAD ION C3 H9 Pb SNBFOEGVGALPSE-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.233 
• R-Value Work: 0.192 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 27.600	α = 90.00
b = 39.200	β = 90.00
c = 65.900	γ = 90.00

Software Package:

Software Name	Purpose
MOSFLM	data reduction
X-PLOR	phasing
X-PLOR	refinement
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-08-16 
• Released Date: 1995-12-07 
• Deposition Author(s): Biou, V., Shu, F., Ramakrishnan, V.

Revision History 

• Version 1.0: 1995-12-07
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance