National Institutes of Health/Office of the Director
AG-04812
米国
National Science Foundation (NSF, United States)
MCB-0958111
米国
引用
ジャーナル: Science / 年: 2018 タイトル: Atomic structures of low-complexity protein segments reveal kinked β sheets that assemble networks. 著者: Michael P Hughes / Michael R Sawaya / David R Boyer / Lukasz Goldschmidt / Jose A Rodriguez / Duilio Cascio / Lisa Chong / Tamir Gonen / David S Eisenberg / 要旨: Subcellular membraneless assemblies are a reinvigorated area of study in biology, with spirited scientific discussions on the forces between the low-complexity protein domains within these assemblies. ...Subcellular membraneless assemblies are a reinvigorated area of study in biology, with spirited scientific discussions on the forces between the low-complexity protein domains within these assemblies. To illuminate these forces, we determined the atomic structures of five segments from protein low-complexity domains associated with membraneless assemblies. Their common structural feature is the stacking of segments into kinked β sheets that pair into protofilaments. Unlike steric zippers of amyloid fibrils, the kinked sheets interact weakly through polar atoms and aromatic side chains. By computationally threading the human proteome on our kinked structures, we identified hundreds of low-complexity segments potentially capable of forming such interactions. These segments are found in proteins as diverse as RNA binders, nuclear pore proteins, and keratins, which are known to form networks and localize to membraneless assemblies.
履歴
登録
2017年12月24日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2018年4月4日
Provider: repository / タイプ: Initial release
改定 1.1
2018年4月25日
Group: Data collection / カテゴリ: diffrn_source / Item: _diffrn_source.source
名称: A crystal containing protofilaments of an 8-residue segment of Nup98 タイプ: COMPLEX / Entity ID: #1 / 由来: NATURAL
分子量
実験値: NO
由来(天然)
生物種: Homo sapiens (ヒト)
EM crystal formation
装置: hanging drop vapor diffusion / Atmosphere: air 詳細: The peptide was solubilized by adding nano-pure H2O with 20% DMSO to achieve a concentration of 12 mg/mL. The peptide solution was immediately used for crystallization. Crystals grew at room ...詳細: The peptide was solubilized by adding nano-pure H2O with 20% DMSO to achieve a concentration of 12 mg/mL. The peptide solution was immediately used for crystallization. Crystals grew at room temperature by hanging drop vapor diffusion. Lipid mixture: none / 温度: 298 K
緩衝液
pH: 9.5
緩衝液成分
ID
濃度
名称
式
Buffer-ID
1
0.1M
CHES
C8H17NO3S
1
2
10percent (v/v)
ethanol
C2H6O
1
試料
濃度: 12 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: crystal
凍結剤: NITROGEN 試料ホルダーモデル: GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER 最高温度: 100 K / 最低温度: 100 K
撮影
平均露光時間: 2 sec. / 電子線照射量: 0.01 e/Å2 フィルム・検出器のモデル: TVIPS TEMCAM-F415 (4k x 4k) Num. of diffraction images: 398 / 撮影したグリッド数: 2 詳細: The detector was operated in rolling shutter mode with 2x2 pixel binning.
画像スキャン
サンプリングサイズ: 15.6 µm / 横: 4096 / 縦: 4096
EM回折
カメラ長: 730 mm
EM回折 シェル
解像度 (Å)
ID
EM diffraction stats-ID
フーリエ空間範囲 (%)
多重度
構造因子数
位相残差 (°)
1.4289-18.0678
1
1
93.8
6.2
1551
41.61
1.1342-1.4289
2
1
94.3
6.4
1525
48.66
0.9909-1.1342
3
1
93.9
5.5
1544
36.54
0.9003-0.9
4
1
70.3
3.2
1179
43.94
EM回折 統計
詳細: Phase statistics are not applicable. No imaging was used. The phases wwere obtained by a crystallographic direct methods program, SHELXD. フーリエ空間範囲: 88 % / 再高解像度: 0.9 Å / 測定した強度の数: 31674 / 構造因子数: 5800 / 位相誤差: 42.6 ° / 位相残差: 42.6 ° / 位相誤差の除外基準: 0 / Rmerge: 0.289 / Rsym: 0.289
回折
平均測定温度: 100 K
放射光源
由来: ELECTRON MICROSCOPE / タイプ: TECNAI F20 TEM / 波長: 0.0251 Å
∠α: 93.14 ° / ∠β: 92.73 ° / ∠γ: 97.15 ° / A: 4.79 Å / B: 18.24 Å / C: 26.44 Å / 空間群名: P1 / 空間群番号: 1
CTF補正
タイプ: NONE
3次元再構成
解像度: 0.9 Å / 解像度の算出法: DIFFRACTION PATTERN/LAYERLINES 詳細: Density map was obtained using measured diffraction intensities and the phases acquired from a crystallographic direct methods program, SHELXD. 対称性のタイプ: 3D CRYSTAL
原子モデル構築
B value: 8 / プロトコル: OTHER / 空間: RECIPROCAL / Target criteria: maximum likelihood
精密化
構造決定の手法: AB INITIO PHASING / 解像度: 0.9→26.36 Å / Cor.coef. Fo:Fc: 0.911 / Cor.coef. Fo:Fc free: 0.895 / SU R Cruickshank DPI: 0.032 / 交差検証法: THROUGHOUT / σ(F): 0 / SU R Blow DPI: 0.03 / SU Rfree Blow DPI: 0.033 / SU Rfree Cruickshank DPI: 0.035