National Health and Medical Research Council (NHMRC, Australia)
APP1126357
オーストラリア
Department of Science & Technology (DST, India)
SPG/2020/000475
インド
Other government
RTI 4006
インド
National Health and Medical Research Council (NHMRC, Australia)
APP1012161
オーストラリア
National Health and Medical Research Council (NHMRC, Australia)
APP1063301
オーストラリア
National Health and Medical Research Council (NHMRC, Australia)
APP1058916
オーストラリア
引用
ジャーナル: Protein Sci / 年: 2022 タイトル: Molecular architecture of nucleosome remodeling and deacetylase sub-complexes by integrative structure determination. 著者: Shreyas Arvindekar / Matthew J Jackman / Jason K K Low / Michael J Landsberg / Joel P Mackay / Shruthi Viswanath / 要旨: The nucleosome remodeling and deacetylase (NuRD) complex is a chromatin-modifying assembly that regulates gene expression and DNA damage repair. Despite its importance, limited structural information ...The nucleosome remodeling and deacetylase (NuRD) complex is a chromatin-modifying assembly that regulates gene expression and DNA damage repair. Despite its importance, limited structural information describing the complete NuRD complex is available and a detailed understanding of its mechanism is therefore lacking. Drawing on information from SEC-MALLS, DIA-MS, XLMS, negative-stain EM, X-ray crystallography, NMR spectroscopy, secondary structure predictions, and homology models, we applied Bayesian integrative structure determination to investigate the molecular architecture of three NuRD sub-complexes: MTA1-HDAC1-RBBP4, MTA1 -HDAC1-MBD3 , and MTA1-HDAC1-RBBP4-MBD3-GATAD2A [nucleosome deacetylase (NuDe)]. The integrative structures were corroborated by examining independent crosslinks, cryo-EM maps, biochemical assays, known cancer-associated mutations, and structure predictions from AlphaFold. The robustness of the models was assessed by jack-knifing. Localization of the full-length MBD3, which connects the deacetylase and chromatin remodeling modules in NuRD, has not previously been possible; our models indicate two different locations for MBD3, suggesting a mechanism by which MBD3 in the presence of GATAD2A asymmetrically bridges the two modules in NuRD. Further, our models uncovered three previously unrecognized subunit interfaces in NuDe: HDAC1 -MTA1 , MTA1 -MBD3 , and HDAC1 -MBD3 . Our approach also allowed us to localize regions of unknown structure, such as HDAC1 and MBD3 , thereby resulting in the most complete and robustly cross-validated structural characterization of these NuRD sub-complexes so far.
Input used in the IMP for the generation of the predicted MHR model. It was derived from an independent processing run using the same dataset as the model used to generate the final map.
全体 : Low resolution map of the MTA1:HDAC1:RBBP7 complex from HEK Expi2...
全体
名称: Low resolution map of the MTA1:HDAC1:RBBP7 complex from HEK Expi293F cells
要素
複合体: Low resolution map of the MTA1:HDAC1:RBBP7 complex from HEK Expi293F cells
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超分子 #1: Low resolution map of the MTA1:HDAC1:RBBP7 complex from HEK Expi2...
超分子
名称: Low resolution map of the MTA1:HDAC1:RBBP7 complex from HEK Expi293F cells タイプ: complex / ID: 1 / 親要素: 0 詳細: Subcomplex that was generated via combination of recombinant proteins pulled down via FLAG tags from HEK Expi293F cells
由来(天然)
生物種: Homo sapiens (ヒト)
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実験情報
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構造解析
手法
ネガティブ染色法
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
0.015 mg/mL
緩衝液
pH: 7.5 構成要素:
濃度
式
名称
10.0 mM
C8H19KN2O5S
HEPES-KOH
75.0 mM
NaCl
sodium chloride
0.3 mM
C4H10O2S2
dithiothreitol
詳細: This is the exchange buffer used for both concentrating the sample and also removing sucrose after GraFix.
染色
タイプ: NEGATIVE / 材質: Uranyl Acetate 詳細: 5 uL of sample was applied to the grid and incubated for 2 minutes. The grid was then blotted and washed with 10 drops of distilled water, with liquid blotted off between each drop. The grid ...詳細: 5 uL of sample was applied to the grid and incubated for 2 minutes. The grid was then blotted and washed with 10 drops of distilled water, with liquid blotted off between each drop. The grid was then pre-stained with a drop 1% Uranyl Acetate, blotted, then stained with a drop of 1% Uranyl Acetate for 30 seconds. It was then blotted again and left to air dry at room temperature.
The sample was in high abundance, and appears to be well dispersed. Some aggregation is clear, and the particles upon closer inspection (such as 2D classification) are heterogeneous. This is likely due to the flexibility of the complex.
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電子顕微鏡法
顕微鏡
FEI TECNAI 12
撮影
フィルム・検出器のモデル: OTHER / デジタル化 - サイズ - 横: 4096 pixel / デジタル化 - サイズ - 縦: 4096 pixel / 実像数: 469 / 平均電子線量: 100.0 e/Å2 詳細: Images recorded on a DE LC1100 lens coupled CCD detector. Estimated dose.
The images selected underwent CTF estimation, with which blob picking was used to select particles with a maximum diameter of about 250 Angstroms (based on information we previously had about the particle size).
粒子像選択
選択した数: 914180 詳細: Use of template from a previous reconstruction run of MHR. This was used for template picking, and the chosen particles were then extracted and underwent 2D Classification.
初期モデル
モデルのタイプ: OTHER 詳細: The model was created using Ab-initio Reconstruction, as a means to judge the quality of the data.
最終 再構成
使用したクラス数: 1 / 想定した対称性 - 点群: C1 (非対称) / アルゴリズム: BACK PROJECTION / 解像度のタイプ: BY AUTHOR / 解像度: 26.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 3.3.1) ソフトウェア - 詳細: Homogeneous refinement (the newest version) was used. 詳細: Homogeneous refinement uses a Gold Standard approach to determine the resolution of the map. 使用した粒子像数: 45954
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.1) ソフトウェア - 詳細: This occurs as above during Ab-initio reconstruction. 詳細: This is used in Ab-initio Reconstruction.
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.1) / ソフトウェア - 詳細: See above. / 詳細: See above.
最終 3次元分類
クラス数: 50 / 平均メンバー数/クラス: 1546 / ソフトウェア - 名称: cryoSPARC (ver. 3.3.1) / ソフトウェア - 詳細: See above. 詳細: 2D classification was used before Ab-initio Reconstruction as a cleanup step.