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Reconstitution of an Argonaute-dependent small RNA biogenesis pathway reveals a handover mechanism involving the RNA exosome and the exonuclease QIP.

Abstract：

:Argonaute proteins are required for the biogenesis of some small RNAs (sRNAs), including the PIWI-interacting RNAs and some microRNAs. How Argonautes mediate maturation of sRNAs independent of their slicer activity is not clear. The maturation of the Neurospora microRNA-like sRNA, milR-1, requires the Argonaute protein QDE-2, Dicer, and QIP. Here, we reconstitute this Argonaute-dependent sRNA biogenesis pathway in vitro and discover that the RNA exosome is also required for milR-1 production. Our results demonstrate that QDE-2 mediates milR-1 maturation by recruiting exosome and QIP and by determining the size of milR-1. The exonuclease QIP first separates the QDE-2-bound pre-milR-1 duplex and then mediates 3' to 5' trimming and maturation of pre-milRNA together with exosome using a handover mechanism. In addition, exosome is also important for the decay of sRNAs. Together, our results establish a biochemical mechanism of an Argonaute-dependent sRNA biogenesis pathway and critical roles of exosome in sRNA processing.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Xue Z,Yuan H,Guo J,Liu Y

doi

10.1016/j.molcel.2012.03.019

subject

Has Abstract

pub_date

2012-05-11 00:00:00

pages

299-310

issue

3

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(12)00226-2

journal_volume

46

pub_type

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