The molecular recognition of kink turn structure by the L7Ae class of proteins

Experimental Data Snapshot

  • Resolution: 2.33 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 

Starting Model: experimental
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The Molecular Recognition of Kink-Turn Structure by the L7Ae Class of Proteins.

Huang, L.Lilley, D.M.J.

(2013) RNA 19: 1703

  • DOI: https://doi.org/10.1261/rna.041517.113
  • Primary Citation of Related Structures:  
    4BW0, 4C40

  • PubMed Abstract: 

    L7Ae is a member of a protein family that binds kink-turns (k-turns) in many functional RNA species. We have solved the X-ray crystal structure of the near-consensus sequence Kt-7 of Haloarcula marismortui bound by Archaeoglobus fulgidus L7Ae at 2.3-Å resolution. We also present a structure of Kt-7 in the absence of bound protein at 2.2-Å resolution. As a result, we can describe a general mode of recognition of k-turn structure by the L7Ae family proteins. The protein makes interactions in the widened major groove on the outer face of the k-turn. Two regions of the protein are involved. One is an α-helix that enters the major groove of the NC helix, making both nonspecific backbone interactions and specific interactions with the guanine nucleobases of the conserved G • A pairs. A hydrophobic loop makes close contact with the L1 and L2 bases, and a glutamate side chain hydrogen bonds with L1. Taken together, these interactions are highly selective for the structure of the k-turn and suggest how conformational selection of the folded k-turn occurs.


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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
50S RIBOSOMAL PROTEIN L7AE123Archaeoglobus fulgidusMutation(s): 0 
Find proteins for O29494 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O29494 
Go to UniProtKB:  O29494
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO29494
Sequence Annotations
  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains LengthOrganismImage
HMKT-726Haloarcula marismortui
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.33 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.92α = 90
b = 61.92β = 90
c = 130.97γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2013-11-27
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description