9b9v
Cryo-EM structure of the ZBTB9 BTB domain filamentCryo-EM structure of the ZBTB9 BTB domain filament
Structural highlights
FunctionZBTB9_HUMAN May be involved in transcriptional regulation. Publication Abstract from PubMedBCL6, an oncogenic transcription factor (TF), forms polymers in the presence of a small-molecule molecular glue that stabilizes a complementary interface between homodimers of BCL6's broad-complex, tramtrack, and bric-a-brac (BTB) domain. The BTB domains of other proteins, including a large class of TFs, have similar architectures and symmetries, raising the possibility that additional BTB proteins self-assemble into higher-order structures. Here, we surveyed 189 human BTB proteins with a cellular fluorescent reporter assay and identified 18 ZBTB TFs that show evidence of polymerization. Through biochemical and cryoelectron microscopy (cryo-EM) studies, we demonstrate that these ZBTB TFs polymerize into filaments. We found that BTB-domain-mediated polymerization of ZBTB TFs enhances chromatin occupancy within regions containing homotypic clusters of TF binding sites, leading to repression of target genes. Our results reveal a role of higher-order structures in regulating ZBTB TFs and suggest an underappreciated role for TF polymerization in modulating gene expression. Polymerization of ZBTB transcription factors regulates chromatin occupancy.,Park PMC, Park J, Brown J, Hunkeler M, Roy Burman SS, Donovan KA, Yoon H, Nowak RP, Slabicki M, Ebert BL, Fischer ES Mol Cell. 2024 Jul 11;84(13):2511-2524.e8. doi: 10.1016/j.molcel.2024.06.010. PMID:38996460[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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