1HU3

MIDDLE DOMAIN OF HUMAN EIF4GII

• PDB DOI: https://doi.org/10.2210/pdb1HU3/pdb

• Classification: TRANSLATION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2001-01-03 Released: 2001-02-21 
• Deposition Author(s): Marcotrigiano, J., Lomakin, I., Pestova, T.V., Hellen, C.U.T., Sonenberg, N., Burley, S.K.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.295 
• R-Value Work: 0.249 

Literature

A conserved HEAT domain within eIF4G directs assembly of the translation initiation machinery.

Marcotrigiano, J., Lomakin, I.B., Sonenberg, N., Pestova, T.V., Hellen, C.U., Burley, S.K.

(2001) Mol Cell 7: 193-203

• PubMed: 11172724 
• DOI: https://doi.org/10.1016/s1097-2765(01)00167-8
• Primary Citation of Related Structures:  
  1HU3


• PubMed Abstract: 
  

  The X-ray structure of the phylogenetically conserved middle portion of human eukaryotic initiation factor (eIF) 4GII has been determined at 2.4 A resolution, revealing a crescent-shaped domain consisting of ten alpha helices arranged as five HEAT repeats. Together with the ATP-dependent RNA helicase eIF4A, this HEAT domain suffices for 48S ribosomal complex formation with a picornaviral RNA internal ribosome entry site (IRES). Structure-based site-directed mutagenesis was used to identify two adjacent features on the surface of this essential component of the translation initiation machinery that, respectively, bind eIF4A and a picornaviral IRES. The structural and biochemical results provide mechanistic insights into both cap-dependent and cap-independent translation initiation.

---

Organizational Affiliation: 

Laboratories of Molecular Biophysics, The Rockefeller University, New York, NY 10021, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30.83 kDa 
• Atom Count: 1,658 
• Modelled Residue Count: 204 
• Deposited Residue Count: 260 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
EIF4GII	A	260	Homo sapiens	Mutation(s): 9
UniProt & NIH Common Fund Data Resources
Find proteins for O43432 (Homo sapiens) Explore O43432  Go to UniProtKB:  O43432
PHAROS:  O43432 GTEx:  ENSG00000075151

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.295 
• R-Value Work: 0.249 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 118.8	α = 90
b = 118.8	β = 90
c = 58.2	γ = 120

Software Package:

Software Name	Purpose
SOLVE	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-02-21 
Deposition Author(s): Marcotrigiano, J., Lomakin, I., Pestova, T.V., Hellen, C.U.T., Sonenberg, N., Burley, S.K.

Revision History  

• Version 1.0: 2001-02-21
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-02-03
  Changes: Database references, Derived calculations, Structure summary