National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
5R01GM092895-08
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2021 タイトル: Structural insights into assembly and function of the RSC chromatin remodeling complex. 著者: Richard W Baker / Janice M Reimer / Peter J Carman / Bengi Turegun / Tsutomu Arakawa / Roberto Dominguez / Andres E Leschziner / 要旨: SWI/SNF chromatin remodelers modify the position and spacing of nucleosomes and, in humans, are linked to cancer. To provide insights into the assembly and regulation of this protein family, we ...SWI/SNF chromatin remodelers modify the position and spacing of nucleosomes and, in humans, are linked to cancer. To provide insights into the assembly and regulation of this protein family, we focused on a subcomplex of the Saccharomyces cerevisiae RSC comprising its ATPase (Sth1), the essential actin-related proteins (ARPs) Arp7 and Arp9 and the ARP-binding protein Rtt102. Cryo-EM and biochemical analyses of this subcomplex shows that ARP binding induces a helical conformation in the helicase-SANT-associated (HSA) domain of Sth1. Surprisingly, the ARP module is rotated 120° relative to the full RSC about a pivot point previously identified as a regulatory hub in Sth1, suggesting that large conformational changes are part of Sth1 regulation and RSC assembly. We also show that a conserved interaction between Sth1 and the nucleosome acidic patch enhances remodeling. As some cancer-associated mutations dysregulate rather than inactivate SWI/SNF remodelers, our insights into RSC complex regulation advance a mechanistic understanding of chromatin remodeling in disease states.
全体 : cryo-EM map of Sth1-Arp7-Arp9-Rtt102 in the ADP BeF3 state bound ...
全体
名称: cryo-EM map of Sth1-Arp7-Arp9-Rtt102 in the ADP BeF3 state bound to the nucleosome with a peeled DNA conformation
要素
複合体: cryo-EM map of Sth1-Arp7-Arp9-Rtt102 in the ADP BeF3 state bound to the nucleosome with a peeled DNA conformation
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超分子 #1: cryo-EM map of Sth1-Arp7-Arp9-Rtt102 in the ADP BeF3 state bound ...
超分子
名称: cryo-EM map of Sth1-Arp7-Arp9-Rtt102 in the ADP BeF3 state bound to the nucleosome with a peeled DNA conformation タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#12
由来(天然)
生物種: Saccharomyces cerevisiae (パン酵母)
組換発現
生物種: Escherichia coli (大腸菌) / 組換株: BL21 Rosetta
分子量
理論値: 440 KDa
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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
単粒子再構成法
試料の集合状態
particle
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試料調製
濃度
1 mg/mL
緩衝液
pH: 7.5
グリッド
モデル: UltrAuFoil / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 雰囲気: AIR / 詳細: Glow discharge for 30 seconds at 25 mAmp
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV / 詳細: 4 second blot time, blot force 20.
詳細
Sample was crosslinked using the GRAFIX protocol
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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 K2 SUMMIT (4k x 4k) 検出モード: COUNTING / 平均露光時間: 7.0 sec. / 平均電子線量: 53.0 e/Å2