Rna polymerases in eukaryotes

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Three types of RNA polymerases exist in eukaryotes- RNA polymerase I, RNA polymerase II and RNA polymerase III. These polymerases have different locations in the nucleus, respond to different inhibitors and are specific to different templates. See table 1 for details of these polymerases.

 Table 1: RNA Polymerases in Eukaryotes   

Type Location Cellular Transcripts Effects of Alpha amanitin
I Nucleolus 18S, 5.8S,and 28S rRNA Insensitive
II Nucleus mRNA, precursors and snRNA strongly inhibited
III Nucleus tRNA and 5S rRNA Inhibited by high concentrations

Pg 834, Biochemistry 6th Edition (2006)

Berg M. J., Tymoczko L. J., Stryer L., (2006) Biochemistry, 6th Edition New York: W. H Freeman

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