Meiotic gene silencing complex MTREC/NURS recruits the nuclear exosome to YTH-RNA-binding protein Mmi1.


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Authors
Yamamoto, Masayuki 
Abstract

Accurate target recognition in transcript degradation is crucial for regulation of gene expression. In the fission yeast Schizosaccharomyces pombe, a number of meiotic transcripts are recognized by a YTH-family RNA-binding protein, Mmi1, and selectively degraded by the nuclear exosome during mitotic growth. Mmi1 forms nuclear foci in mitotically growing cells, and the nuclear exosome colocalizes to such foci. However, it remains elusive how Mmi1 and the nuclear exosome are connected. Here, we show that a complex called MTREC (Mtl1-Red1 core) or NURS (nuclear RNA silencing) that consists of a zinc-finger protein, Red1, and an RNA helicase, Mtl1, is required for the recruitment of the nuclear exosome to Mmi1 foci. Physical interaction between Mmi1 and the nuclear exosome depends on Red1. Furthermore, a chimeric protein involving Mmi1 and Rrp6, which is a nuclear-specific component of the exosome, suppresses the ectopic expression phenotype of meiotic transcripts in red1Δ cells and mtl1 mutant cells. These data indicate that the primary function of MTREC/NURS in meiotic transcript elimination is to link Mmi1 to the nuclear exosome physically.

Description
Keywords
Carrier Proteins, DEAD-box RNA Helicases, Exosomes, Gene Expression Regulation, Fungal, Meiosis, RNA Interference, Recombinant Fusion Proteins, Ribonucleases, Schizosaccharomyces pombe Proteins, mRNA Cleavage and Polyadenylation Factors
Journal Title
PLoS Genet
Conference Name
Journal ISSN
1553-7390
1553-7404
Volume Title
16
Publisher
Public Library of Science (PLoS)