Publication Date:
2011-03-26
Description:
Pervasive transcription of eukaryotic genomes generates a plethora of noncoding RNAs. In fission yeast, the heterochromatin factor Clr4/Suv39 methyltransferase facilitates RNA interference (RNAi)-mediated processing of centromeric transcripts into small interfering RNAs (siRNAs). Clr4 also mediates degradation of antisense RNAs at euchromatic loci, but the underlying mechanism has remained elusive. We show that Clr4 and the RNAi effector RITS (RNA-induced transcriptional silencing) interact with Mlo3, a protein related to mRNA quality control and export factors. Loss of Clr4 impairs RITS interaction with Mlo3, which is required for centromeric siRNA production and antisense suppression. Mlo3 also interacts with the RNA surveillance factor TRAMP, which suppresses antisense RNAs targeted by Clr4 and RNAi. These findings link Clr4 to RNA quality control machinery and suggest a pathway for processing potentially deleterious RNAs through the coordinated actions of RNAi and other RNA processing activities.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Ke -- Fischer, Tamas -- Porter, Rebecca L -- Dhakshnamoorthy, Jothy -- Zofall, Martin -- Zhou, Ming -- Veenstra, Timothy -- Grewal, Shiv I S -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2011 Mar 25;331(6024):1624-7. doi: 10.1126/science.1198712.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Biochemistry and Molecular Biology, National Cancer Institute/NIH, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21436456" target="_blank"〉PubMed〈/a〉
Keywords:
Cell Cycle Proteins/genetics/*metabolism
;
Centromere/metabolism
;
Euchromatin/metabolism
;
Histones/metabolism
;
Methylation
;
Methyltransferases/genetics/*metabolism
;
Mutation
;
*RNA Interference
;
RNA Processing, Post-Transcriptional
;
RNA, Antisense/*metabolism
;
RNA, Fungal/*metabolism
;
RNA-Binding Proteins/metabolism
;
Saccharomyces cerevisiae Proteins/metabolism
;
Schizosaccharomyces/*genetics/*metabolism
;
Schizosaccharomyces pombe Proteins/genetics/*metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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