Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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Ribosomal protein S7: a new RNA-binding motif with structural similarities to a DNA architectural factor.

Hosaka, H.Nakagawa, A.Tanaka, I.Harada, N.Sano, K.Kimura, M.Yao, M.Wakatsuki, S.

(1997) Structure 5: 1199-1208

  • DOI: https://doi.org/10.1016/s0969-2126(97)00270-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The ribosome is a ribonucleoprotein complex which performs the crucial function of protein biosynthesis. Its role is to decode mRNAs within the cell and to synthesize the corresponding proteins. Ribosomal protein S7 is located at the head of the small (30S) subunit of the ribosome and faces into the decoding centre. S7 is one of the primary 16S rRNA-binding proteins responsible for initiating the assembly of the head of the 30S subunit. In addition, S7 has been shown to be the major protein component to cross-link with tRNA molecules bound at both the aminoacyl-tRNA (A) and peptidyl-tRNA (P) sites of the ribosome. The ribosomal protein S7 clearly plays an important role in ribosome function. It was hoped that an atomic-resolution structure of this protein would aid our understanding of ribosomal mechanisms. The structure of ribosomal protein S7 from Bacillus stearothermophilus has been solved at 2.5 A resolution using multiwavelength anomalous diffraction and selenomethionyl-substituted proteins. The molecule consists of a helical hydrophobic core domain and a beta-ribbon arm extending from the hydrophobic core. The helical core domain is composed of a pair of entangled helix-turn-helix motifs; the fold of the core is similar to that of a DNA architectural factor. Highly conserved basic and aromatic residues are clustered on one face of the S7 molecule and create a 16S rRNA contact surface. The molecular structure of S7, together with the results of previous cross-linking experiments, suggest how this ribosomal protein binds to the 3' major domain of 16S rRNA and mediates the folding of 16S rRNA to create the ribosome decoding centre.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RIBOSOMAL PROTEIN S7155Geobacillus stearothermophilusMutation(s): 6 
Gene Names: S7
Find proteins for P22744 (Geobacillus stearothermophilus)
Explore P22744 
Go to UniProtKB:  P22744
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22744
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.4α = 90
b = 131.02β = 90
c = 29.15γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-01-28
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance