4K0K

Crystal structure of the Thermus thermophilus 30S ribosomal subunit complexed with a serine-ASL and mRNA containing a stop codon


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Unusual base pairing during the decoding of a stop codon by the ribosome.

Fernandez, I.S.Ng, C.L.Kelley, A.C.Wu, G.Yu, Y.T.Ramakrishnan, V.

(2013) Nature 500: 107-110

  • DOI: https://doi.org/10.1038/nature12302
  • Primary Citation of Related Structures:  
    4JV5, 4JYA, 4K0K, 4V9I

  • PubMed Abstract: 

    During normal translation, the binding of a release factor to one of the three stop codons (UGA, UAA or UAG) results in the termination of protein synthesis. However, modification of the initial uridine to a pseudouridine (Ψ) allows efficient recognition and read-through of these stop codons by a transfer RNA (tRNA), although it requires the formation of two normally forbidden purine-purine base pairs. Here we determined the crystal structure at 3.1 Å resolution of the 30S ribosomal subunit in complex with the anticodon stem loop of tRNA(Ser) bound to the ΨAG stop codon in the A site. The ΨA base pair at the first position is accompanied by the formation of purine-purine base pairs at the second and third positions of the codon, which show an unusual Watson-Crick/Hoogsteen geometry. The structure shows a previously unsuspected ability of the ribosomal decoding centre to accommodate non-canonical base pairs.


  • Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK.


Macromolecules

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S2235Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S3207Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S4208Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S5151Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S6101Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S7155Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S8138Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S9127Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1099Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S11119Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S12126Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S13121Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1460Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1588Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 16
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1684Thermus thermophilus HB8Mutation(s): 0 
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Entity ID: 17
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S17100Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 18
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1870Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 19
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S1979Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 20
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein S2099Thermus thermophilus HB8Mutation(s): 0 
UniProt
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Entity ID: 21
MoleculeChains Sequence LengthOrganismDetailsImage
30S ribosomal protein THX25synthetic constructMutation(s): 0 
UniProt
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Entity ID: 1
MoleculeChains LengthOrganismImage
16S ribosomal RNA1,517Thermus thermophilus HB8
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Entity ID: 22
MoleculeChains LengthOrganismImage
mRNAV [auth X]5synthetic construct
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Entity ID: 23
MoleculeChains LengthOrganismImage
RNA-ASLW [auth Y]11Thermus thermophilus HB8
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 401.3α = 90
b = 401.3β = 90
c = 173.68γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Database references
  • Version 1.2: 2013-08-21
    Changes: Database references