Skip to main content
. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Crit Rev Biochem Mol Biol. 2011 Feb;46(1):27–40. doi: 10.3109/10409238.2010.538662

Table 1.

Subunit composition of cellular RNAPs

Eukaryotic Pol II Archaeal RNAP Bacterial RNAP
Class I subunit Rpb1 A′+A″ β ′
Rpb2 B β
Rpb3 D α I
Rpb6 K ω
Rpb11 L α II
Class II subunit Rpb4 F
Rpb5 H
Rpb7 E
Rpb8 G
Rpb10 N
Rpb12 P
Class III subunit Rpb91
Gdown12 Rpo132 δ 2
1

found only in the eukaryotic Pol II

2

found only in certain species and these subunits are not orthologs