5XGU

Escherichia coli. RNase R


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.188 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural insights into RNA unwinding and degradation by RNase R.

Chu, L.Y.Hsieh, T.J.Golzarroshan, B.Chen, Y.P.Agrawal, S.Yuan, H.S.

(2017) Nucleic Acids Res 45: 12015-12024

  • DOI: https://doi.org/10.1093/nar/gkx880
  • Primary Citation of Related Structures:  
    5XGU

  • PubMed Abstract: 

    RNase R is a conserved exoribonuclease in the RNase II family that primarily participates in RNA decay in all kingdoms of life. RNase R degrades duplex RNA with a 3' overhang, suggesting that it has RNA unwinding activity in addition to its 3'-to-5' exoribonuclease activity. However, how RNase R coordinates RNA binding with unwinding to degrade RNA remains elusive. Here, we report the crystal structure of a truncated form of Escherichia coli RNase R (residues 87-725) at a resolution of 1.85 Å. Structural comparisons with other RNase II family proteins reveal two open RNA-binding channels in RNase R and suggest a tri-helix 'wedge' region in the RNB domain that may induce RNA unwinding. We constructed two tri-helix wedge mutants and they indeed lost their RNA unwinding but not RNA binding or degrading activities. Our results suggest that the duplex RNA with an overhang is bound in the two RNA-binding channels in RNase R. The 3' overhang is threaded into the active site and the duplex RNA is unwound upon reaching the wedge region during RNA degradation. Thus, RNase R is a proficient enzyme, capable of concurrently binding, unwinding and degrading structured RNA in a highly processive manner during RNA decay.


  • Organizational Affiliation

    Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 11529, ROC.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease RA [auth B],
B [auth A]
645Escherichia coli DEC6AMutation(s): 1 
Gene Names: rnrECDEC6A_5034
EC: 3.1.13.1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.691α = 90
b = 120.863β = 91.61
c = 83.626γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-18
    Type: Initial release
  • Version 1.1: 2017-10-25
    Changes: Database references
  • Version 1.2: 2017-11-29
    Changes: Database references
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Derived calculations, Refinement description