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

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.3203· OSTI ID:1255288
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Chemistry
  2. Univ. of California, Davis, CA (United States). Dept. of Molecular and Cellular Biology
  3. Univ. of California, Davis, CA (United States). Dept. of Chemistry. Dept. of Molecular and Cellular Biology

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. In this paper, 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. In conclusion, our results provide a structural framework for understanding the effects of ADAR mutations associated with human disease.

Research Organization:
Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Inst. of Health (NIH) (United States)
Grant/Contract Number:
AC02-06CH11357; AC02-76SF00515; R01GM061115; T32 GM007377; P41GM103393; P41 GM103403; S10 RR029205
OSTI ID:
1255288
Journal Information:
Nature Structural & Molecular Biology, Vol. 23, Issue 5; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 124 works
Citation information provided by
Web of Science

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Cited By (34)

All I's on the RADAR: role of ADAR in gene regulation journal May 2018
ADAR RNA editing in human disease; more to it than meets the I journal September 2017
Programmable base editing of A•T to G•C in genomic DNA without DNA cleavage journal October 2017
Structural basis for targeted DNA cytosine deamination and mutagenesis by APOBEC3A and APOBEC3B journal December 2016
The emerging and uncultivated potential of CRISPR technology in plant science journal July 2019
Base editing: precision chemistry on the genome and transcriptome of living cells journal October 2018
In vivo RNA editing of point mutations via RNA-guided adenosine deaminases journal February 2019
Identification of RNA-binding protein targets with HyperTRIBE journal July 2018
Site-directed RNA repair of endogenous Mecp2 RNA in neurons journal October 2017
Adenosine Deaminase That Acts on RNA 3 (ADAR3) Binding to Glutamate Receptor Subunit B Pre-mRNA Inhibits RNA Editing in Glioblastoma journal February 2017
A protein–protein interaction underlies the molecular basis for substrate recognition by an adenosine-to-inosine RNA-editing enzyme journal September 2018
RNA binding candidates for human ADAR3 from substrates of a gain of function mutant expressed in neuronal cells journal September 2019
Learning cis -regulatory principles of ADAR-based RNA editing from CRISPR-mediated mutagenesis journal November 2019
RNA editing with CRISPR-Cas13 journal October 2017
A cytosine deaminase for programmable single-base RNA editing journal July 2019
A-to-I editing of Malacoherpesviridae RNAs supports the antiviral role of ADAR1 in mollusks journal July 2019
Long-read sequencing uncovers a complex transcriptome topology in varicella zoster virus journal December 2018
Population and allelic variation of A-to-I RNA editing in human transcriptomes journal July 2017
Massive A-to-I RNA editing is common across the Metazoa and correlates with dsRNA abundance journal October 2017
Editing inducer elements increases A-to-I editing efficiency in the mammalian transcriptome journal October 2017
Rewriting the transcriptome: adenosine-to-inosine RNA editing by ADARs journal October 2017
ADAR RNA editing below the backbone journal May 2017
Functions of the RNA Editing Enzyme ADAR1 and Their Relevance to Human Diseases journal December 2016
RNA Editing as a Therapeutic Approach for Retinal Gene Therapy Requiring Long Coding Sequences journal January 2020
RNA editing with CRISPR-Cas13 journal September 2018
Learning cis-regulatory principles of ADAR-based RNA editing from CRISPR-mediated mutagenesis journal April 2021
Adar RNA editing-dependent and -independent effects are required for brain and innate immune functions in Drosophila journal March 2020
Regulation of RNA editing by intracellular acidification journal March 2021
Probing RNA recognition by human ADAR2 using a high-throughput mutagenesis method journal September 2016
DNA editing in DNA/RNA hybrids by adenosine deaminases that act on RNA journal January 2017
Mechanistic Implications of Enhanced Editing by a HyperTRIBE RNA-binding protein journal November 2017
Promoting RNA editing by ADAR attraction journal October 2017
Differential Enzymatic Activity of Rat ADAR2 Splicing Variants Is Due to Altered Capability to Interact with RNA in the Deaminase Domain journal February 2018
Role of Inosine–Uracil Base Pairs in the Canonical RNA Duplexes journal June 2018

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