- EMDB-44391: Cryo-EM structure of the ZBTB9 BTB domain filament -
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基本情報
登録情報
データベース: EMDB / ID: EMD-44391
タイトル
Cryo-EM structure of the ZBTB9 BTB domain filament
マップデータ
primary map
試料
複合体: ZBTB9 BTB domain filament
タンパク質・ペプチド: Zinc finger and BTB domain-containing protein 9
キーワード
BTB domain / transcription factor / ZBTB protein / transcription
機能・相同性
機能・相同性情報
DNA-binding transcription factor activity, RNA polymerase II-specific / RNA polymerase II cis-regulatory region sequence-specific DNA binding / regulation of transcription by RNA polymerase II / zinc ion binding / identical protein binding / nucleus 類似検索 - 分子機能
ジャーナル: Mol Cell / 年: 2024 タイトル: Polymerization of ZBTB transcription factors regulates chromatin occupancy. 著者: Paul M C Park / Jiho Park / Jared Brown / Moritz Hunkeler / Shourya S Roy Burman / Katherine A Donovan / Hojong Yoon / Radosław P Nowak / Mikołaj Słabicki / Benjamin L Ebert / Eric S Fischer / 要旨: 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, ...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.
UniProtKB: Zinc finger and BTB domain-containing protein 9
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
らせん対称体再構成法
試料の集合状態
filament
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試料調製
濃度
0.95 mg/mL
緩衝液
pH: 7.4 構成要素:
濃度
式
名称
50.0 mM
C8H18N2O4S/NaOH
HEPES/NaOH pH 7.4
200.0 mM
NaCl
NaCl
0.25 mM
C32H58N2O8S
CHAPSO
1.0 mM
C9H15O6P
TCEP
詳細: 50 mM HEPES/NaOH pH 7.4, 200 mM NaCl, 0.25 mM CHAPSO, 1 mM TCEP
グリッド
モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: HOLEY / 支持フィルム - Film thickness: 12 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 60 sec. / 前処理 - 雰囲気: AIR / 前処理 - 気圧: 0.039 kPa 詳細: Grids were glow-discharged for 60 s at 15-20 mA and 39 Pa
凍結
凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 283 K / 装置: LEICA EM GP 詳細: Grids were vitrified using a Leica EM GP plunge freezer operated at 90% humidity and 10 C with 10 s pre-blot, 3 s blot, 3 s post-blot..
詳細
Elution fractions from Strep-tag affinity chromatography were dialyzed overnight against 50 mM HEPES/NaOH pH 7.4, 200 mM NaCl, 1 mM TCEP and concentrated by centrifugation.
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電子顕微鏡法
顕微鏡
FEI TALOS ARCTICA
撮影
フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 1137 / 平均露光時間: 4.5 sec. / 平均電子線量: 50.1 e/Å2 詳細: 1 movie (45 frames) was acquired per hole and stage position.
想定した対称性 - らせんパラメータ - Δz: 36.1 Å 想定した対称性 - らせんパラメータ - ΔΦ: 101.9 ° 想定した対称性 - らせんパラメータ - 軸対称性: C1 (非対称) アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 8.1 Å / 解像度の算出法: FSC 0.143 CUT-OFF 詳細: Asymmetric helical refinement followed by local refinement led to the final reconstruction. The helical symmetry values represent the angular rotation and axial rise for two dimers at the ...詳細: Asymmetric helical refinement followed by local refinement led to the final reconstruction. The helical symmetry values represent the angular rotation and axial rise for two dimers at the core of the map, where the local resolution was the highest. These values, however, were not applied during helical refinement as they did not improve the quality of the final reconstruction. 使用した粒子像数: 147135
Segment selection
選択した数: 2022676
初期モデル
モデルのタイプ: OTHER / 詳細: Ab-initio reconstruction
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD
FSC曲線 (解像度の算出)
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原子モデル構築 1
初期モデル
Chain - Source name: AlphaFold / Chain - Initial model type: in silico model
詳細
Real-space refinement without local grid search
精密化
空間: REAL / プロトコル: OTHER / 温度因子: 762
得られたモデル
PDB-9b9v: Cryo-EM structure of the ZBTB9 BTB domain filament