ASI1-immunoprecipitated protein 3

UniProtKB accession:  Q8RXT5

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Transcriptional repressor (PubMed:33433058). Together with PHD finger-containing proteins (e.g. PHD1, PAIPP2/PHD2, AIPP2/PHD3, PHD4, PHD5 and PHD6), cooperates to form a BAH-PHD bivalent histone reader complex able to read histone H3 lysine 27 trimethylation (H3K27me3) and low-methylated H3K4 histone marks in order to regulate transcription, especially to prevent early flowering; H3K27me3 reader of this complex (PubMed:33277495, PubMed:33433058). CPL2 is subsequently recruited to form a BAH-PHD-CPL2 complex (BPC) in order to silence several H3K27me3 and low-methylated H3K4 enriched loci, including AGO5, via the phosphorylation state-dependent inhibition of Pol II release from the transcriptional start site (e.g. Ser5P-Pol II dephosphorylation) (PubMed:33277495, PubMed:33433058). The BPC complex represses flowering by inhibiting the expression of several genes, including AGL6, FT, FUL and SOC1 (PubMed:33277495, PubMed:33433058). Prevents the accumulation of intronic heterochromatin-containing genes (e.g. IBM1, At3g05410 and RPP7) (PubMed:28808009). Seems to not be involved in vernalization establishment, by contrast to orthologs in grass plants (PubMed:28584114).