TATA box-binding protein-associated factor RNA polymerase I subunit A
Definition:
Component of the transcription factor SL1/TIF-IB complex, which is involved in the assembly of the PIC (pre-initiation complex) during RNA polymerase I-dependent transcription. The rate of PIC formation probably is primarily dependent on the rate of association of SL1/TIF-IB with the rDNA promoter. SL1/TIF-IB is involved in stabilization of nucleolar transcription factor 1/UBTF on rDNA. Formation of SL1/TIF-IB excludes the association of TBP with TFIID subunits.
References:
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[1]. L Comai, et al. Reconstitution of transcription factor SL1: exclusive binding of TBP by SL1 or TFIID subunits. Science. 1994 Dec 23;266(5193):1966-72. [Content Brief]
[2]. J Karsten Friedrich, et al. TBP-TAF complex SL1 directs RNA polymerase I pre-initiation complex formation and stabilizes upstream binding factor at the rDNA promoter. J Biol Chem. 2005 Aug 19;280(33):29551-8. [Content Brief]
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