5HP3

Human Adenosine Deaminase Acting on dsRNA (ADAR2) bound to dsRNA sequence derived from S. cerevisiae BDF2 gene with AC mismatch at reaction site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.09 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.167 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.7 of the entry. See complete history


Literature

Structures of human ADAR2 bound to dsRNA reveal base-flipping mechanism and basis for site selectivity.

Matthews, M.M.Thomas, J.M.Zheng, Y.Tran, K.Phelps, K.J.Scott, A.I.Havel, J.Fisher, A.J.Beal, P.A.

(2016) Nat Struct Mol Biol 23: 426-433

  • DOI: https://doi.org/10.1038/nsmb.3203
  • Primary Citation of Related Structures:  
    5ED1, 5ED2, 5HP2, 5HP3

  • PubMed Abstract: 

    Adenosine deaminases acting on RNA (ADARs) are editing enzymes that convert adenosine to inosine in duplex RNA, a modification reaction with wide-ranging consequences in RNA function. Understanding of the ADAR reaction mechanism, the origin of editing-site selectivity, and the effect of mutations is limited by the lack of high-resolution structural data for complexes of ADARs bound to substrate RNAs. Here we describe four crystal structures of the human ADAR2 deaminase domain bound to RNA duplexes bearing a mimic of the deamination reaction intermediate. These structures, together with structure-guided mutagenesis and RNA-modification experiments, explain the basis of the ADAR deaminase domain's dsRNA specificity, its base-flipping mechanism, and its nearest-neighbor preferences. In addition, we identified an ADAR2-specific RNA-binding loop near the enzyme active site, thus rationalizing differences in selectivity observed between different ADARs. Finally, our results provide a structural framework for understanding the effects of ADAR mutations associated with human disease.


  • Organizational Affiliation

    Department of Chemistry, University of California, Davis, Davis, California, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Double-stranded RNA-specific editase 1
A, D
403Homo sapiensMutation(s): 0 
Gene Names: ADARB1ADAR2DRADA2RED1
EC: 3.5.4.37
UniProt & NIH Common Fund Data Resources
Find proteins for P78563 (Homo sapiens)
Explore P78563 
Go to UniProtKB:  P78563
PHAROS:  P78563
GTEx:  ENSG00000197381 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP78563
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(*UP*UP*CP*CP*CP*CP*AP*CP*AP*UP*UP*(8AZ)P*GP*AP*CP*GP*UP*UP*CP*AP*GP*UP*C)-3')23Saccharomyces cerevisiae
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
RNA (5'-R(*GP*AP*CP*UP*GP*AP*AP*CP*GP*AP*CP*CP*AP*AP*UP*GP*UP*GP*GP*GP*GP*AP*A)-3')23Saccharomyces cerevisiae
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.09 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.51α = 90
b = 107.21β = 90
c = 120.62γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXmodel building
XSCALEdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM061115

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-13
    Type: Initial release
  • Version 1.1: 2016-04-27
    Changes: Database references
  • Version 1.2: 2016-05-18
    Changes: Database references
  • Version 1.3: 2017-09-13
    Changes: Author supporting evidence, Derived calculations
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.5: 2020-10-14
    Changes: Derived calculations, Structure summary
  • Version 1.6: 2021-02-10
    Changes: Derived calculations
  • Version 1.7: 2023-09-27
    Changes: Data collection, Database references, Refinement description