Conservation of a triple-helix-forming RNA stability element in noncoding and genomic RNAs of diverse viruses.
Conservation of a triple-helix-forming RNA stability element in noncoding and genomic RNAs of diverse viruses.
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DOI:
10.1016/j.celrep.2012.05.020
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发表时间:
2012-07-26
期刊:
影响因子:
8.8
通讯作者:
Steitz JA
中科院分区:
文献类型:
--
作者:
Tycowski KT;Shu MD;Borah S;Shi M;Steitz JA
Abundant expression of the long noncoding (lnc) PAN (polyadenylated nuclear) RNA by the human oncogenic gammaherpesvirus KSHV depends on a cis-element called the ENE. The ENE upregulates PAN RNA by inhibiting its rapid nuclear decay through triple-helix formation with the poly(A) tail. Using structure-based bioinformatics, we identified six novel ENE-like elements in evolutionarily diverse viral genomes. Five are in double-stranded DNA viruses, including mammalian herpesviruses, insect polydnaviruses and a protist mimivirus. One is in an insect picorna-like positive-strand RNA virus, suggesting that the ENE can counteract cytoplasmic as well as nuclear RNA decay pathways. Functionality of four of the new ENE elements was demonstrated by increased accumulation of an intronless polyadenylated reporter transcript in human cells. Identification of these ENEs enabled the discovery of PAN RNA homologs in two additional gammaherpesviruses, RRV and EHV2. Our findings demonstrate that searching for structural elements can lead to rapid identification of lncRNAs.
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