An RNA-dependent RNA polymerase contributing to double-stranded precursors for canonical RdDM small RNAs.
Its RNA-copying activity helps convert a single-stranded RNA substrate into a double-stranded precursor for later processing. This step differs from copying DNA into RNA, which is performed by a DNA-dependent polymerase. [ref]
Metal A and metal B sites of nuclear RNA polymerases Pol IV and Pol V are required for siRNA-dependent DNA methylation and gene silencing by J. R. Haag and others. 2009, Pol IV/Pol V-dependent siRNA pathway
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