TAF9 functions as a component of the DNA-binding general transcription factor complex TFIID and the regulatory transcription complex SAGA. Binding of TFIID to a promoter (with or without TATA element) is the initial step in pre-initiation complex (PIC) formation. TFIID plays a key role in the regulation of gene expression by RNA polymerase II through different activities such as transcription activator interaction, core promoter recognition and selectivity, TFIIA and TFIIB interaction, chromatin modification (histone acetylation by TAF1), facilitation of DNA opening and initiation of transcription. SAGA influences RNA polymerase II transcriptional activity through different activities such as TBP interaction (SPT3 and SPT8) and promoter selectivity, interaction with transcription activators (GCN5, ADA2, ADA3, and TRA1), and chromatin modification through histone acetylation (GCN5).
Immunocytochemistry/Immunofluorescence analysis of MCF-7 (human breast carcinoma) cells labelling TAF9 with purified ab169784 at 1/500. Cells were fixed with 4% Paraformaldehyde. An Alexa Fluor® 488-conjugated goat anti-rabbit IgG (ab150077) at 1/1000 dilution was used as the secondary antibody. Nuclei couterstained with DAPI (blue).
Secondary Only Control: PBS was used instead of the primary antibody as the negative control.