ジャーナル: Science / 年: 2008 タイトル: Molecular architecture of the "stressosome," a signal integration and transduction hub. 著者: Jon Marles-Wright / Tim Grant / Olivier Delumeau / Gijs van Duinen / Susan J Firbank / Peter J Lewis / James W Murray / Joseph A Newman / Maureen B Quin / Paul R Race / Alexis Rohou / Willem ...著者: Jon Marles-Wright / Tim Grant / Olivier Delumeau / Gijs van Duinen / Susan J Firbank / Peter J Lewis / James W Murray / Joseph A Newman / Maureen B Quin / Paul R Race / Alexis Rohou / Willem Tichelaar / Marin van Heel / Richard J Lewis / 要旨: A commonly used strategy by microorganisms to survive multiple stresses involves a signal transduction cascade that increases the expression of stress-responsive genes. Stress signals can be ...A commonly used strategy by microorganisms to survive multiple stresses involves a signal transduction cascade that increases the expression of stress-responsive genes. Stress signals can be integrated by a multiprotein signaling hub that responds to various signals to effect a single outcome. We obtained a medium-resolution cryo-electron microscopy reconstruction of the 1.8-megadalton "stressosome" from Bacillus subtilis. Fitting known crystal structures of components into this reconstruction gave a pseudoatomic structure, which had a virus capsid-like core with sensory extensions. We suggest that the different sensory extensions respond to different signals, whereas the conserved domains in the core integrate the varied signals. The architecture of the stressosome provides the potential for cooperativity, suggesting that the response could be tuned dependent on the magnitude of chemophysical insult.
プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 0.9699 Å / 相対比: 1
反射
解像度: 2.3→19.1 Å / Num. obs: 12304 / % possible obs: 97.2 % / Observed criterion σ(I): 1.5 / 冗長度: 3.4 % / Rmerge(I) obs: 0.08 / Net I/σ(I): 11.1
反射 シェル
解像度: 2.3→2.42 Å / 冗長度: 3.5 % / Rmerge(I) obs: 0.54 / Mean I/σ(I) obs: 2.1 / % possible all: 98.8
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解析
ソフトウェア
名称
バージョン
分類
REFMAC
5.4.0077
精密化
MOSFLM
データ削減
SCALA
データスケーリング
SHELX
位相決定
精密化
構造決定の手法: 単波長異常分散 開始モデル: NONE 解像度: 2.3→19.06 Å / Cor.coef. Fo:Fc: 0.935 / Cor.coef. Fo:Fc free: 0.921 / SU B: 21.491 / SU ML: 0.22 / TLS residual ADP flag: LIKELY RESIDUAL / 交差検証法: THROUGHOUT / ESU R: 0.341 / ESU R Free: 0.261 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. U VALUES RESIDUAL ONLY
Rfactor
反射数
%反射
Selection details
Rfree
0.28
593
4.8 %
RANDOM
Rwork
0.226
-
-
-
obs
0.228
11710
96.3 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK