BAHD1 (bromo adjacent homology domain-containing 1 protein) is, as its name suggests, a bromo-adjacent homology (BAH) domain. The BAH domain is found in eukaryotic DNA (cytosine-5) methyltransferases, the origin recognition complex 1 (Orc1) proteins, and several proteins involved in transcriptional regulation. It is thought to function as a protein-protein interaction domain. The BAH domain of yeast Sir3p has been shown to bind to nucleosomes and to the N-terminal tail of histone H3.
Nucleus. Note: Localizes to heterochromatin and inactive X chromosome. Colocalizes with histone H3 trimethylated at 'Lys-27' (H3K27me3).