RNA Polymerase Subunits & Other Transcription Proteins
|
Subunit
|
Structural Gene
|
Mass
|
Function
|
|
|
(kDa)
|
|
a
|
rpoA
|
72
|
initiation, assembly of B and B'
|
|
b
|
rpoB
|
150
|
catalysis, substrate and product binding
|
|
b'
|
rpoC
|
160
|
template binding
|
|
|
|
s70
|
rpoD
|
83
|
promoter selection
|
|
s32
|
rpoH
|
32
|
promoter selection, heat-shock
|
|
s28
|
fliA
|
28
|
promoter selection, flagella, chemotaxis
|
|
s24
|
rpoE
|
24
|
extracellular functions, heat-shock
|
|
s38
|
rpoS (katF)
|
38
|
Post-exponential phase expression
|
|
s54
|
rpoN
|
54
|
Nitrogen lmitation gene expression
|
|
|
|
omega (w)
|
rpoZ
|
|
Unwinding
|
|
rho (r)
|
rho
|
50
|
Termination
|
|
NusA
|
nusA
|
69
|
Pausing, transcription termination
|
|
NusB
|
nusB
|
14.5
|
Pausing, transcription termination
|
|
NusG
|
nusG
|
20
|
Pausing, transcription termination
|
|
GreA
|
greA
|
20
|
3' to 5' RNA hydrolysis; proofreading?
|
|
GreB
|
greB
|
|
3' to 5' RNA hydrolysis; proofreading?
|