A mammalian RNA editing enzyme

1 February 1996

journal article
research article
Published by Springer Nature in Nature

Vol. 379 (6564) , 460-464
https://doi.org/10.1038/379460a0

Abstract

EDITING of RNA¹ by site-selective adenosine deamination alters codons in brain-expressed pre-messenger RNAs for glutamate receptor (GluR) subunits^2–4 including a codon for a channel determinant (Q/R site) in GluR-B, which controls the Ca²⁺ permeability of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors^5,6. Editing of GluR pre-mRNAs requires a double-stranded RNA (dsRNA) structure formed by exonic and intronic sequences^4,7 and is catalysed by an unknown dsRNA adenosine deaminase. Here we report the cloning of complementary DNA for RED1, a dsRNA adenosine deaminase expressed in brain and peripheral tissues that efficiently edits the Q/R site in GluR-B pre-mRNA in vitro. This site is poorly edited by DRADA, which is distantly sequence-related to RED1. Both deaminases edit the R/G site in GluR-B pre-mRNA, indicating that members of an emerging gene family catalyse adenosine deamination in nuclear transcripts with distinct but overlapping substrate specificities.

Keywords

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