Bacterial RNA polymerases
a(2),b,b1,s
a - 2 subunits/holoenzyme (40kDa each)
b,b1 - single- related subunits with catalytic activity
(~155 kDa each)
(the above subunits related to euk. RNA pols)
s - variable subunit - promoter recognition
(30-90 kDa)
Bact. RNA pol. transcribes all bacterial RNAs
(tRNAs, rRNAs, mRNAs)
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