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- W2016246105 abstract "In Arabidopsis, the RNA-directed DNA methylation pathway is important for establishing and maintaining DNA methylation — here Pol V is shown to depend on SUVH2 and SUVH9, where both of these proteins are proposed to bind specifically to methylated DNA to recruit Pol V, providing a self-reinforcing loop mechanism for maintenance of RNA-directed DNA methylation. In the model plant Arabidopsis, the RNA-directed DNA methylation (RdDM) pathway is important for establishing and maintaining DNA methylation at genomic sites such as retrotransposons and heterochromatic repeats. The pathway involves two RNA polymerase complexes: Pol IV, which synthesizes small interfering RNAs, and Pol V, which generates non-coding transcripts that recruit downstream RdDM factors. Here, Steven Jacobsen and colleagues show that Pol V is dependent on two SRA/SET domain proteins, SUVH2 and SUVH9, for its activity and its recruitment to chromatin. SUVH2 and SUVH9 are proposed to bind specifically to methylated DNA in order to recruit Pol V, providing a self-reinforcing loop mechanism for maintenance of RdDM. This work suggests a mechanism for selectively targeting regions of plant genomes for epigenetic silencing. RNA-directed DNA methylation in Arabidopsis thaliana depends on the upstream synthesis of 24-nucleotide small interfering RNAs (siRNAs) by RNA POLYMERASE IV (Pol IV)1,2 and downstream synthesis of non-coding transcripts by Pol V. Pol V transcripts are thought to interact with siRNAs which then recruit DOMAINS REARRANGED METHYLTRANSFERASE 2 (DRM2) to methylate DNA3,4,5,6,7. The SU(VAR)3-9 homologues SUVH2 and SUVH9 act in this downstream step but the mechanism of their action is unknown8,9. Here we show that genome-wide Pol V association with chromatin redundantly requires SUVH2 and SUVH9. Although SUVH2 and SUVH9 resemble histone methyltransferases, a crystal structure reveals that SUVH9 lacks a peptide-substrate binding cleft and lacks a properly formed S-adenosyl methionine (SAM)-binding pocket necessary for normal catalysis, consistent with a lack of methyltransferase activity for these proteins8. SUVH2 and SUVH9 both contain SRA (SET- and RING-ASSOCIATED) domains capable of binding methylated DNA8, suggesting that they function to recruit Pol V through DNA methylation. Consistent with this model, mutation of DNA METHYLTRANSFERASE 1 (MET1) causes loss of DNA methylation, a nearly complete loss of Pol V at its normal locations, and redistribution of Pol V to sites that become hypermethylated. Furthermore, tethering SUVH2 with a zinc finger to an unmethylated site is sufficient to recruit Pol V and establish DNA methylation and gene silencing. These results indicate that Pol V is recruited to DNA methylation through the methyl-DNA binding SUVH2 and SUVH9 proteins, and our mechanistic findings suggest a means for selectively targeting regions of plant genomes for epigenetic silencing." @default.
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- W2016246105 date "2014-01-22" @default.
- W2016246105 modified "2023-10-05" @default.
- W2016246105 title "SRA- and SET-domain-containing proteins link RNA polymerase V occupancy to DNA methylation" @default.
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- W2016246105 doi "https://doi.org/10.1038/nature12931" @default.
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