TATA box binding protein (TBP)-associated factor, RNA polymerase I, A, 48kDa; 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.
Synonyms: TAF1A, TAF1Ap, hTAF1A, Q15573, Q5JRA7 ...