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Pol II
Catalyzes RNA synthesis
TBP (TATA binding protein)
Specifically recognizes the TATA box; associated with promoter
TFIIA
Stabilizes binding of TFIIB and TBP to the promoter
TFIIB
Binds to TBP and recruits Pol II–TFIIF complex
TFIID
Required for initiation at promoters lacking a TATA box
TFIIE
Recruits TFIIH; has ATPase and helicase activities
TFIIF
Binds tightly to Pol II; binds to TFIIB and prevents binding of Pol II to nonspecific DNA sequences
TFIIH
Unwinds DNA at promoter (helicase activity); phosphorylates Pol II CTD (carboxy-terminal domain); recruits nucleotide-excision repair protein
ELL, pTEFb, TFIIS, and Elongin (elongation factors)
These factors suppress pausing/arrest of transcription by the Pol II complex.