Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.217 

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This is version 1.3 of the entry. See complete history


Crystal structure of prokaryotic ribosomal protein L9: a bi-lobed RNA-binding protein.

Hoffman, D.W.Davies, C.Gerchman, S.E.Kycia, J.H.Porter, S.J.White, S.W.Ramakrishnan, V.

(1994) EMBO J 13: 205-212

  • DOI: https://doi.org/10.1002/j.1460-2075.1994.tb06250.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of protein L9 from the Bacillus stearothermophilus ribosome has been determined at 2.8 A resolution using X-ray diffraction methods. This primary RNA-binding protein has a highly elongated and unusual structure consisting of two separated domains joined by a long exposed alpha-helix. Conserved, positively charged and aromatic amino acids on the surfaces of both domains probably represent the sites of specific interactions with 23S rRNA. Comparisons with other prokaryotic L9 sequences show that while the length of the connecting alpha-helix is invariant, the sequence within the exposed central region is not conserved. This suggests that the alpha-helix has an architectural role and serves to fix the relative separation and orientation of the N- and C-terminal domains within the ribosome. The N-terminal domain has structural homology to the smaller ribosomal proteins L7/L12 and L30, and the eukaryotic RNA recognition motif (RRM).

  • Organizational Affiliation

    Department of Microbiology, Duke University Medical Center, Durham, NC 27710.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RIBOSOMAL PROTEIN L9149Geobacillus stearothermophilusMutation(s): 0 
Find proteins for P02417 (Geobacillus stearothermophilus)
Explore P02417 
Go to UniProtKB:  P02417
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02417
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.217 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135α = 90
b = 37.3β = 90
c = 49γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-01-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Other