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A third member of the RNA-specific adenosine deaminase gene family, ADAR3, contains both single- and double-stranded RNA binding domains

Published online by Cambridge University Press:  01 May 2000

CHUN-XIA CHEN
Affiliation:
The Wistar Institute, Philadelphia, Pennsylvania 19104, USA
DAN-SUNG C. CHO
Affiliation:
The Wistar Institute, Philadelphia, Pennsylvania 19104, USA
QINGDE WANG
Affiliation:
The Wistar Institute, Philadelphia, Pennsylvania 19104, USA
FANG LAI
Affiliation:
The Wistar Institute, Philadelphia, Pennsylvania 19104, USA
KENNETH C. CARTER
Affiliation:
Human Genome Sciences, Inc., Rockville, Maryland 20850, USA
KAZUKO NISHIKURA
Affiliation:
The Wistar Institute, Philadelphia, Pennsylvania 19104, USA
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Abstract

Members of the double-stranded RNA- (dsRNA) specific adenosine deaminase gene family convert adenosine residues into inosines in dsRNA and are involved in A-to-I RNA editing of transcripts of glutamate receptor (GluR) subunits and serotonin receptor subtype 2C (5-HT2CR). We have isolated hADAR3, the third member of this class of human enzyme and investigated its editing site selectivity using in vitro RNA editing assay systems. As originally reported for rat ADAR3 or RED2, purified ADAR3 proteins could not edit GluR-B RNA at the “Q/R” site, the “R/G” site, and the intronic “hot spot” site. In addition, ADAR3 did not edit any of five sites discovered recently within the intracellular loop II region of 5-HT2CR RNAs, confirming its total lack of editing activity for currently known substrate RNAs. Filter-binding analyses revealed that ADAR3 is capable of binding not only to dsRNA but also to single-stranded RNA (ssRNA). Deletion mutagenesis identified a region rich in arginine residues located in the N-terminus that is responsible for binding of ADAR3 to ssRNA. The presence of this ssRNA-binding domain as well as its expression in restricted brain regions and postmitotic neurons make ADAR3 distinct from the other two ADAR gene family members, editing competent ADAR1 and ADAR2. ADAR3 inhibited in vitro the activities of RNA editing enzymes of the ADAR gene family, raising the possibility of a regulatory role in RNA editing.

Type
Research Article
Copyright
2000 RNA Society

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