- EMDB-23403: Reconstituted 207 bp Archaeasome, Class I -
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基本情報
登録情報
データベース: EMDB / ID: EMD-23403
タイトル
Reconstituted 207 bp Archaeasome, Class I
マップデータ
Reconstructed volume of Arc207 complex (Archaeasome complex with 7 archaeal histone dimers binding 207 bp of DNA), Arc150 "base" resolved with unresolved Arc60 "lid".
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
F32GM137496
米国
引用
ジャーナル: Elife / 年: 2021 タイトル: Archaeal chromatin 'slinkies' are inherently dynamic complexes with deflected DNA wrapping pathways. 著者: Samuel Bowerman / Jeff Wereszczynski / Karolin Luger / 要旨: Eukaryotes and many archaea package their DNA with histones. While the four eukaryotic histones wrap ~147 DNA base pairs into nucleosomes, archaeal histones form 'nucleosome-like' complexes that ...Eukaryotes and many archaea package their DNA with histones. While the four eukaryotic histones wrap ~147 DNA base pairs into nucleosomes, archaeal histones form 'nucleosome-like' complexes that continuously wind between 60 and 500 base pairs of DNA ('archaeasomes'), suggested by crystal contacts and analysis of cellular chromatin. Solution structures of large archaeasomes (>90 DNA base pairs) have never been directly observed. Here, we utilize molecular dynamics simulations, analytical ultracentrifugation, and cryoEM to structurally characterize the solution state of archaeasomes on longer DNA. Simulations reveal dynamics of increased accessibility without disruption of DNA-binding or tetramerization interfaces. Mg concentration influences compaction, and cryoEM densities illustrate that DNA is wrapped in consecutive substates arranged 90 out-of-plane with one another. Without ATP-dependent remodelers, archaea may leverage these inherent dynamics to balance chromatin packing and accessibility.
ダウンロード / ファイル: emd_23403.map.gz / 形式: CCP4 / 大きさ: 64 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Reconstructed volume of Arc207 complex (Archaeasome complex with 7 archaeal histone dimers binding 207 bp of DNA), Arc150 "base" resolved with unresolved Arc60 "lid".
名称: Archaeasome containing 207 bp of DNA / タイプ: complex / ID: 1 / 親要素: 0 詳細: Archaeasome (archaeal histone-DNA complex) formed by 7 histone dimers wrapping 207 bp of DNA.
由来(天然)
生物種: Thermococcus kodakarensis (古細菌)
組換発現
生物種: Escherichia coli (大腸菌)
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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
0.9 mg/mL
緩衝液
pH: 8 構成要素:
濃度
式
名称
100.0 mM
KCl
Potassium chloride
50.0 mM
Tris-HCl
tris(hydroxymethyl)aminomethane hydrochloride
凍結
凍結剤: ETHANE / 装置: HOMEMADE PLUNGER 詳細: Manual plunge at ambient temperature and humidity..
詳細
Sample was observed to be monodisperse via Sedimentation Velocity Analytical Ultracentrifugation.