6N6H

Vibrio cholerae Oligoribonuclease bound to pCpU


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A dedicated diribonucleotidase resolves a key bottleneck for the terminal step of RNA degradation.

Kim, S.K.Lormand, J.D.Weiss, C.A.Eger, K.A.Turdiev, H.Turdiev, A.Winkler, W.C.Sondermann, H.Lee, V.T.

(2019) Elife 8

  • DOI: 10.7554/eLife.46313
  • Primary Citation of Related Structures:  
    6N6G, 6N6F, 6N6I, 6N6H, 6N6K, 6N6J, 6N6A, 6N6C, 6N6E, 6N6D

  • PubMed Abstract: 
  • Degradation of RNA polymers, an ubiquitous process in all cells, is catalyzed by specific subsets of endo- and exoribonucleases that together recycle RNA fragments into nucleotide monophosphate. In γ-proteobacteria, 3-'5' exoribonucleases comprise up to eight distinct enzymes ...

    Degradation of RNA polymers, an ubiquitous process in all cells, is catalyzed by specific subsets of endo- and exoribonucleases that together recycle RNA fragments into nucleotide monophosphate. In γ-proteobacteria, 3-'5' exoribonucleases comprise up to eight distinct enzymes. Among them, Oligoribonuclease (Orn) is unique as its activity is required for clearing short RNA fragments, which is important for cellular fitness. However, the molecular basis of Orn's unique cellular function remained unclear. Here, we show that Orn exhibits exquisite substrate preference for diribonucleotides. Crystal structures of substrate-bound Orn reveal an active site optimized for diribonucleotides. While other cellular RNases process oligoribonucleotides down to diribonucleotide entities, Orn is the one and only diribonucleotidase that completes the terminal step of RNA degradation. Together, our studies indicate RNA degradation as a step-wise process with a dedicated enzyme for the clearance of a specific intermediate pool, diribonucleotides, that affects cellular physiology and viability.


    Organizational Affiliation

    Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, United States.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OligoribonucleaseA181Vibrio choleraeMutation(s): 0 
Gene Names: orn
EC: 3.1
UniProt
Find proteins for Q9KV17 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KV17 
Go to UniProtKB:  Q9KV17
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    RNA (5'-R(P*CP*U)-3')B [auth D]2synthetic construct
    Protein Feature View
    Expand
    • Reference Sequence
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    NA
    Query on NA

    Download Ideal Coordinates CCD File 
    C [auth D]SODIUM ION
    Na
    FKNQFGJONOIPTF-UHFFFAOYSA-N
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 1.76 Å
    • R-Value Free: 0.184 
    • R-Value Work: 0.161 
    • R-Value Observed: 0.162 
    • Space Group: P 32 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 89.07α = 90
    b = 89.07β = 90
    c = 60.143γ = 120
    Software Package:
    Software NamePurpose
    XDSdata reduction
    SCALAdata scaling
    PHENIXrefinement
    PDB_EXTRACTdata extraction
    PHENIXphasing

    Structure Validation

    View Full Validation Report



    Entry History & Funding Information

    Deposition Data


    Funding OrganizationLocationGrant Number
    National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM123609

    Revision History  (Full details and data files)

    • Version 1.0: 2019-06-12
      Type: Initial release
    • Version 1.1: 2019-10-16
      Changes: Data collection, Database references
    • Version 1.2: 2020-01-01
      Changes: Author supporting evidence