Zcchc11-dependent uridylation of microRNA directs cytokine expression.

Zcchc11-dependent uridylation of microRNA directs cytokine expression.
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DOI:
10.1038/ncb1931
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发表时间:
2009-09
影响因子:
21.3
通讯作者:
Mizgerd JP
Mizgerd JP
中科院分区:
生物学1区
文献类型:
--
作者:
Jones MR;Quinton LJ;Blahna MT;Neilson JR;Fu S;Ivanov AR;Wolf DA;Mizgerd JP

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Mounting an effective host immune response without incurring inflammatory injury requires the precise regulation of cytokine expression,. To achieve this, cytokine mRNAs are post-transcriptionally regulated by diverse RNA-binding proteins and microRNAs (miRNAs) targeting their 3′ untranslated regions (UTRs),. Zcchc11 (zinc-finger, CCHC domain-containing protein 11) contains RNA-interacting motifs, and has been implicated in signalling pathways involved in cytokine expression. The nature of the Zcchc11 protein and how it influences cytokine expression are unknown. Here we show that Zcchc11 directs cytokine expression by uridylating cytokine-targeting miRNAs. Zcchc11 is a ribonucleotidyltransferase with a preference for uridine and is essential for maintaining the poly(A) tail length and stability of transcripts for interleukin-6 (IL-6) and other specific cytokines. The miR-26 family of miRNAs targets IL-6, and the addition of terminal uridines to the miR-26 3′ end abrogates IL-6 repression. Whereas 78% of miR-26a sequences in control cells contained 1–3 uridines on their 3′ ends, less than 0.1% did so inZcchc11-knockdown cells. Thus, Zcchc11 fine tunes IL-6 production by uridylating miR-26a, which we propose is an enzymatic modification of the terminal nucleotide sequence of mature miRNA as a means to regulate gene expression.
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