SAGA-associated factor 29

UniProtKB accession:  P25554

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Chromatin reader component of the transcription regulatory histone acetylation (HAT) complexes SAGA and SLIK (PubMed:10026213, PubMed:15647753, PubMed:21685874, PubMed:24307402). In the SAGA complex, SGF29 specifically recognizes and binds methylated 'Lys-4' of histone H3 (H3K4me), with a preference for trimethylated form (H3K4me3) (PubMed:21685874). SGF29 is also required for heterochromatin boundary formation function (PubMed:24307402). SAGA is involved in RNA polymerase II-dependent transcriptional regulation of approximately 10% of yeast genes At the promoters, SAGA is required for recruitment of the basal transcription machinery (PubMed:10026213). It influences RNA polymerase II transcriptional activity through different activities such as TBP interaction (SPT3, SPT8 and SPT20) and promoter selectivity, interaction with transcription activators (GCN5, ADA2, ADA3 and TRA1), and chromatin modification through histone acetylation (GCN5) and deubiquitination (UBP8) (PubMed:10026213). SAGA acetylates nucleosomal histone H3 to some extent (to form H3K9ac, H3K14ac, H3K18ac and H3K23ac). SAGA interacts with DNA via upstream activating sequences (UASs) (PubMed:10026213). SLIK is proposed to have partly overlapping functions with SAGA (PubMed:15647753). It preferentially acetylates methylated histone H3, at least after activation at the GAL1-10 locus (PubMed:15647753).