4J7M

Crystal structure of mouse DXO in complex with substrate mimic RNA and calcium ion


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

A mammalian pre-mRNA 5' end capping quality control mechanism and an unexpected link of capping to pre-mRNA processing.

Jiao, X.Chang, J.H.Kilic, T.Tong, L.Kiledjian, M.

(2013) Mol Cell 50: 104-115

  • DOI: https://doi.org/10.1016/j.molcel.2013.02.017
  • Primary Citation of Related Structures:  
    4J7L, 4J7M, 4J7N

  • PubMed Abstract: 

    Recently, we reported that two homologous yeast proteins, Rai1 and Dxo1, function in a quality control mechanism to clear cells of incompletely 5' end-capped messenger RNAs (mRNAs). Here, we report that their mammalian homolog, Dom3Z (referred to as DXO), possesses pyrophosphohydrolase, decapping, and 5'-to-3' exoribonuclease activities. Surprisingly, we found that DXO preferentially degrades defectively capped pre-mRNAs in cells. Additional studies show that incompletely capped pre-mRNAs are inefficiently spliced at all introns, a fact that contrasts with current understanding, and are also poorly cleaved for polyadenylation. Crystal structures of DXO in complex with substrate mimic and products at a resolution of up to 1.5Å provide elegant insights into the catalytic mechanism and molecular basis for their three apparently distinct activities. Our data reveal a pre-mRNA 5' end capping quality control mechanism in mammalian cells, indicating DXO as the central player for this mechanism, and demonstrate an unexpected intimate link between proper 5' end capping and subsequent pre-mRNA processing.


  • Organizational Affiliation

    Department Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08854, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein Dom3Z378Mus musculusMutation(s): 0 
Gene Names: Dom3zNg6
EC: 3.6.1 (UniProt), 3.1.13 (UniProt)
UniProt
Find proteins for O70348 (Mus musculus)
Explore O70348 
Go to UniProtKB:  O70348
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO70348
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(P*UP*(U37)P*(U37)P*UP*U)-3')5synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.985α = 90
b = 87.837β = 111.69
c = 54.356γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2014-03-12
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations