Structure of E. coli RppH bound to RNA and two magnesium ions

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

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Structures of RNA Complexes with the Escherichia coli RNA Pyrophosphohydrolase RppH Unveil the Basis for Specific 5'-End-dependent mRNA Decay.

Vasilyev, N.Serganov, A.

(2015) J Biol Chem 290: 9487-9499

  • DOI: https://doi.org/10.1074/jbc.M114.634824
  • Primary Citation of Related Structures:  
    4S2V, 4S2W, 4S2X, 4S2Y

  • PubMed Abstract: 

    5'-End-dependent RNA degradation impacts virulence, stress responses, and DNA repair in bacteria by controlling the decay of hundreds of mRNAs. The RNA pyrophosphohydrolase RppH, a member of the Nudix hydrolase superfamily, triggers this degradation pathway by removing pyrophosphate from the triphosphorylated RNA 5' terminus. Here, we report the x-ray structures of Escherichia coli RppH (EcRppH) in apo- and RNA-bound forms. These structures show distinct conformations of EcRppH·RNA complexes on the catalytic pathway and suggest a common catalytic mechanism for Nudix hydrolases. EcRppH interacts with RNA by a bipartite mechanism involving specific recognition of the 5'-terminal triphosphate and the second nucleotide, thus enabling discrimination against mononucleotides as substrates. The structures also reveal the molecular basis for the preference of the enzyme for RNA substrates bearing guanine in the second position by identifying a protein cleft in which guanine interacts with EcRppH side chains via cation-π contacts and hydrogen bonds. These interactions explain the modest specificity of EcRppH at the 5' terminus and distinguish the enzyme from the highly selective RppH present in Bacillus subtilis. The divergent means by which RNA is recognized by these two functionally and structurally analogous enzymes have important implications for mRNA decay and the regulation of protein biosynthesis in bacteria.

  • Organizational Affiliation

    From the Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York 10016 alexander.serganov@nyumc.org.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA pyrophosphohydrolase161Escherichia coli K-12Mutation(s): 2 
Gene Names: rppHnudHygdPb2830JW2798
EC: 3.6.1
Find proteins for P0A776 (Escherichia coli (strain K12))
Explore P0A776 
Go to UniProtKB:  P0A776
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A776
Sequence Annotations
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(*(APC)*GP*U)-3')3N/A
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.499α = 90
b = 38.868β = 100.13
c = 57.201γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHENIXmodel building
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Database references
  • Version 1.2: 2015-05-06
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description