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XB-ART-50112
RNA 2015 Feb 01;212:279-95. doi: 10.1261/rna.047787.114.
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Evidence for multiple, distinct ADAR-containing complexes in Xenopus laevis.

Schweidenback CT , Emerman AB , Jambhekar A , Blower MD .


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ADAR (adenosine deaminase acting on RNA) is an RNA-editing enzyme present in most metazoans that converts adenosines in double-stranded RNA targets into inosines. Although the RNA targets of ADAR-mediated editing have been extensively cataloged, our understanding of the cellular function of such editing remains incomplete. We report that long, double-stranded RNA added to Xenopus laevis egg extract is incorporated into an ADAR-containing complex whose protein components resemble those of stress granules. This complex localizes to microtubules, as assayed by accumulation on meiotic spindles. We observe that the length of a double-stranded RNA influences its incorporation into the microtubule-localized complex. ADAR forms a similar complex with endogenous RNA, but the endogenous complex fails to localize to microtubules. In addition, we characterize the endogenous, ADAR-associated RNAs and discover that they are enriched for transcripts encoding transcriptional regulators, zinc-finger proteins, and components of the secretory pathway. Interestingly, association with ADAR correlates with previously reported translational repression in early embryonic development. This work demonstrates that ADAR is a component of two, distinct ribonucleoprotein complexes that contain different types of RNAs and exhibit diverse cellular localization patterns. Our findings offer new insight into the potential cellular functions of ADAR.

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Species referenced: Xenopus laevis
Genes referenced: ada adar

References [+] :
Athanasiadis, Widespread A-to-I RNA editing of Alu-containing mRNAs in the human transcriptome. 2004, Pubmed