Associated component of the proteasome that specifically recognizes acetylated histones and promotes ATP- and ubiquitin-independent degradation of core histones during DNA damage response. Recognizes and binds acetylated histones via its bromodomain-like (BRDL) region and activates the proteasome by opening the gated channel for substrate entry. Binds to the core proteasome via its C-terminus, which occupies the same binding sites as the proteasomal ATPases, opening the closed structure of the proteasome via an active gating mechanism. Involved in DNA damage response in somatic cells: binds to acetylated histones and promotes degradation of histones following DNA double-strand breaks. According to PubMed:12973301, colocalizes with nascent proteasome. According to PubMed:15778719, associates with proteasome core particles and also forms a complex with regulatory particle-core particle (RP-CP). The bromodomain-like (BRDL) region specifically recognizes and binds acetylated histones. The YYX motif is required for the association with the proteasome. Present with 2600 molecules/cell in log phase SD medium. Belongs to the BLM10 family. Produces 2 separate ORFs. Produces 2 separate ORFs.