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Ers1, a rapidly diverging protein essential for RNA interference-dependent heterochromatic silencing in Schizosaccharomyces pombe.

J Biol Chem. 2008 Sep 19;283(38):25770-3. Epub 2008 Jul 25
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摘要


Centromeric silencing and heterochromatin formation in Schizosaccharomyces pombe require the RNA interference machinery. Three factors that mediate this mechanism have been identified: 1) the RNA-dependent RNA polymerase complex RdRC, 2) the Argonaute-containing RITS (RNA-induced initiation of transcriptional silencing) complex, and 3) the endoribonuclease Dicer ortholog Dcr1. S. pombe mutants lacking a new factor described here, Ers1, are completely defective in silencing of centromeric regions but, importantly, not in silencing at the mat3M or tel2R loci. ers1Delta cells likewise fail to convert centromeric pre-small interfering RNA transcripts into small interfering RNAs, are defective in histone H3 Lys(9) methylation, and are unable to recruit the RITS complex to centromeric sequences. Surprisingly, Ers1 lacks obvious orthologs outside of the genus Schizosaccharomyces. Within this group, it is diverging rapidly, raising the possibility that it is coevolving with target RNA elements.

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