Cited by 23Genomics and Chromatin DynamicsChromatin Remodeling and CancerEpigenetics and DNA Methylation

Polymerization of ZBTB transcription factors regulates chromatin occupancy

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Park, Paul M.C., Park, Jiho, Brown, Jared, Hunkeler, Moritz, Roy Burman, Shourya S., Donovan, Katherine A., Yoon, Hojong, Nowak, Radosław P. +3 more·2024·Molecular Cell

Abstract

BCL6, 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-à-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.

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  • Few studies have conclusively shown that TF multimerisation is a pre-requisite for efficient DNA-binding, but more recent works on BTB domain proteins and FOXP3 have suggested that higher-order assemblies of these TFs are needed for their cellular functions.

    “Few studies have conclusively shown that TF multimerisation is a pre-requisite for efficient DNA-binding (e.g. SOX6 73 ), but more recent works on BTB domain proteins 74 and FOXP3 75 have suggested that higher-order assemblies of these TFs are needed for their cellular functions.”

    From Tetramerisation governs SALL transcription factor function in development and disease (2025) · cites this paper as [74]

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  1. [41]Punjani A, Rubinstein JL, Fleet DJ, and Brubaker MA (2017). cryoSPARC: algorithms for rapid unsupervised cryo-EM structure determination. Nature Methods 14, 290– 296. 10.1038/nmeth.4169. 28165473 · DOI

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Authors
Park, P. M. C., Park, J., Brown, J., Hunkeler, M., Roy Burman, S. S., Donovan, K. A., Yoon, H., Nowak, R. P., Słabicki, M., Ebert, B. L., & Fischer, E. S.
Affiliations
  • Broad Institute (US)
  • Harvard University (US)
Corresponding author
  • Ebert, Benjamin L.
  • Fischer, Eric S.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2024-07
Volume
84
Issue
13
Pages
2511-2524.e8
ISSN
1097-2765 (ISSN-L)
OpenAlex
W4400537798
Cited by
22
References
69
Citations by year
2026: 8 · 2025: 11 · 2024: 3
FWCI
2.99
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
Funders
  • National Institutes of Health (R35CA253125, R01HL082945, P01CA066996, P50CA206963)
  • Howard Hughes Medical Institute
  • Astellas Pharma US
  • Edward P. Evans Foundation
  • Dr. Miriam and Sheldon G. Adelson Medical Research Foundation
  • Harvard Medical School
  • AbbVie
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
BTB domain, protein polymerization, chromatin occupancy, transcriptional repression, BCL6, molecular glues, protein filament assembly, protein higher-order structure, gene expression regulation
MeSH terms
Binding Sites, Chromatin, Gene Expression Regulation, Humans, Protein Binding, Transcription Factors, Cryoelectron Microscopy, Protein Multimerization, HEK293 Cells, Polymerization

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