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Human ATAD2 Walker B mutant-H3/H4K5Q complex, ATP state (Class III)
Structural highlights
FunctionATAD2_HUMAN May be a transcriptional coactivator of the nuclear receptor ESR1 required to induce the expression of a subset of estradiol target genes, such as CCND1, MYC and E2F1. May play a role in the recruitment or occupancy of CREBBP at some ESR1 target gene promoters. May be required for histone hyperacetylation. Involved in the estrogen-induced cell proliferation and cell cycle progression of breast cancer cells.[1] Publication Abstract from PubMedATAD2 is a non-canonical ATP-dependent histone chaperone and a major cancer target. Despite widespread efforts to design drugs targeting the ATAD2 bromodomain, little is known about the overall structural organization and regulation of ATAD2. Here, we present the 3.1 A cryo-EM structure of human ATAD2 in the ATP state, showing a shallow hexameric spiral that binds a peptide substrate at the central pore. The spiral conformation is locked by an N-terminal linker domain (LD) that wedges between the seam subunits, thus limiting ATP-dependent symmetry breaking of the AAA+ ring. In contrast, structures of the ATAD2-histone H3/H4 complex show the LD undocked from the seam, suggesting that H3/H4 binding unlocks the AAA+ spiral by allosterically releasing the LD. These findings, together with the discovery of an inter-subunit signaling mechanism, reveal a unique regulatory mechanism for ATAD2 and lay the foundation for developing new ATAD2 inhibitors. Structure of the human ATAD2 AAA+ histone chaperone reveals mechanism of regulation and inter-subunit communication.,Cho C, Ganser C, Uchihashi T, Kato K, Song JJ Commun Biol. 2023 Sep 28;6(1):993. doi: 10.1038/s42003-023-05373-1. PMID:37770645[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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