RNA polymerase IV complex
RNA polymerase IV is a multisubunit RNA polymerase complex found in the nucleus of plants and involved in accumulation of siRNAs and in DNA methylation-dependent silencing of endogenous repeated sequences. Pol IV is composed of subunits that are paralogous or identical to the 12 subunits of Pol II. The largest and second-largest subunits of Pol IV are the catalytic subunits and share similarity with the corresponding subunits of other eukaryotic and bacterial multisubunit RNA polymerases. The second largest subunit is also found in RNA polymerase V, while the largest subunit is found only in RNAP IV complex.
GO:0000428
DNA-directed RNA polymerase complex
is_a
GO:0140513
nuclear protein-containing complex
is_a
DNA-directed RNA polymerase IV complex
exact
DNA-directed RNA polymerase IVa complex
exact