Biological Assembly 1  

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Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 17.63 kDa 
• Atom Count: 1025 
• Residue Count: 48 
• Unique nucleic acid chains: 1

1KH6

Crystal Structure of an RNA Tertiary Domain Essential to HCV IRES-mediated Translation Initiation.

• DOI: 10.2210/pdb1KH6/pdb
• NDB: UR0018

• Classification: RNA
• Mutation(s): No 


• Deposited: 2001-11-29 Released: 2002-04-26 
• Deposition Author(s): Kieft, J.S., Zhou, K., Grech, A., Jubin, R., Doudna, J.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.279 
• R-Value Work: 0.283 

Literature

Crystal structure of an RNA tertiary domain essential to HCV IRES-mediated translation initiation.

Kieft, J.S., Zhou, K., Grech, A., Jubin, R., Doudna, J.A.

(2002) Nat Struct Biol 9: 370-374

• PubMed: 11927953 
• DOI: 10.1038/nsb781
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The hepatitis C virus (HCV) internal ribosome entry site (IRES) RNA drives internal initiation of viral protein synthesis during host cell infection. In the tertiary structure of the IRES RNA, two helical junctions create recognition sites for direct binding of the 40S ribosomal subunit and eukaryotic initiation factor 3 (eIF3). The 2.8 A resolution structure of the IIIabc four-way junction, which is critical for binding eIF3, reveals how junction nucleotides interact with an adjacent helix to position regions directly involved in eIF3 recognition. Two of the emergent helices stack to form a nearly continuous A-form duplex, while stacking of the other two helices is interrupted by the insertion of junction residues into the helix minor groove. This distorted stack probably serves as an important recognition surface for the translational machinery.

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Organizational Affiliation: 

[1] Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114 USA. [2] Howard Hughes Medical Institute, Yale University, New Haven, Connecticut 06520-8114 USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Length	Organism
JIIIabc	A	53	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.279 
• R-Value Work: 0.283 
• Space Group: P 4₂ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 66.532	α = 90
b = 66.532	β = 90
c = 95.85	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-11-29 
• Released Date: 2002-04-26 
Deposition Author(s): Kieft, J.S., Zhou, K., Grech, A., Jubin, R., Doudna, J.A.

Revision History 

• Version 1.0: 2002-04-26
  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: 2017-02-08
  Changes: Database references, Structure summary