Crystal Structure Analysis of the archaebacterial ribosomal protein S7

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.196 

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The structure of the archaebacterial ribosomal protein S7 and its possible interaction with 16S rRNA.

Hosaka, H.Yao, M.Kimura, M.Tanaka, I.

(2001) J Biochem 130: 695-701

  • DOI: https://doi.org/10.1093/oxfordjournals.jbchem.a003036
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Ribosomal protein S7 is one of the ubiquitous components of the small subunit of the ribosome. It is a 16S rRNA-binding protein positioned close to the exit of the tRNA, and it plays a role in initiating assembly of the head of the 30S subunit. Previous structural analyses of eubacterial S7 have shown that it has a stable alpha-helix core and a flexible beta-arm. Unlike these eubacterial proteins, archaebacterial or eukaryotic S7 has an N-terminal extension of approximately 60 residues. The crystal structure of S7 from archaebacterium Pyrococcus horikoshii (PhoS7) has been determined at 2.1 A resolution. The final model of PhoS7 consists of six major alpha-helices, a short 3(10)-helix and two beta-stands. The major part (residues 18-45) of the N-terminal extension of PhoS7 reinforces the alpha-helical core by well-extended hydrophobic interactions, while the other part (residues 46-63) is not visible in the crystal and is possibly fixed only by interacting with 16S rRNA. These differences in the N-terminal extension as well as in the insertion (between alpha1 and alpha2) of the archaebacterial S7 structure from eubacterial S7 are such that they do not necessitate a major change in the structure of the currently available eubacterial 16S rRNA. Some of the inserted chains might pass through gaps formed by helices of the 16S rRNA.

  • Organizational Affiliation

    Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RIBOSOMAL PROTEIN S7218Pyrococcus horikoshiiMutation(s): 0 
Gene Names: PH1541
Find proteins for O59230 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Explore O59230 
Go to UniProtKB:  O59230
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO59230
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.196 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.9α = 90
b = 58.9β = 90
c = 118.1γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-08-29
    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: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Refinement description