two different open conformations of the helicase core of the RNA helicase Hera

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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This is version 1.3 of the entry. See complete history


Rearranging RNA structures at 75C? toward the molecular mechanism and physiological function of the thermus thermophilus DEAD-box helicase hera.

Klostermeier, D.

(2013) Biopolymers 99: 1137-1146

  • DOI: https://doi.org/10.1002/bip.22316
  • Primary Citation of Related Structures:  
    4KBF, 4KBG

  • PubMed Abstract: 

    DEAD-box helicases catalyze the ATP-dependent destabilization of RNA duplexes. Hera is a DEAD-box helicase from Thermus thermophilus that consists of a helicase core, followed by a C-terminal extension comprising a dimerization domain and an RNA-binding domain. The combined structural information on individual Hera domains provides a molecular model of the Hera dimer. The modular architecture with flexible connections between individual domains affords different relative orientations of the RBD relative to the Hera helicase core, and of the two helicase cores within the dimer. Presumably, domain movements are intimately linked to RNA binding, to the interplay of the RBD and the helicase core, and to RNA unwinding, and may impact on the functional cooperation of the two helicase cores in RNA unwinding. The in vivo function of Hera is unknown. The Hera RBD recognizes two distinct elements in the RNA substrate, a single-stranded and a structured region. The helicase core then unwinds an adjacent RNA duplex in an ATP-dependent reaction. Overall, this mode of action is reminiscent of DEAD-box proteins that act as general RNA chaperones. This review summarizes the current knowledge on Hera structure and function, and discusses a possible role of Hera in the Thermus thermophilus cold-shock response.

  • Organizational Affiliation

    Institute for Physical Chemistry, University of Muenster, Corrensstrasse 30, D-48149, Muenster, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heat resistant RNA dependent ATPase
A, B
365Thermus thermophilus HB27Mutation(s): 0 
Gene Names: TT_C1895
Find proteins for Q72GF3 (Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27))
Explore Q72GF3 
Go to UniProtKB:  Q72GF3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ72GF3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.645α = 90
b = 119.645β = 90
c = 107.095γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2013-12-25
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description