#1: ジャーナル: Nature / 年: 2016 タイトル: Structure of the T4 baseplate and its function in triggering sheath contraction. 著者: Nicholas M I Taylor / Nikolai S Prokhorov / Ricardo C Guerrero-Ferreira / Mikhail M Shneider / Christopher Browning / Kenneth N Goldie / Henning Stahlberg / Petr G Leiman / 要旨: Several systems, including contractile tail bacteriophages, the type VI secretion system and R-type pyocins, use a multiprotein tubular apparatus to attach to and penetrate host cell membranes. This ...Several systems, including contractile tail bacteriophages, the type VI secretion system and R-type pyocins, use a multiprotein tubular apparatus to attach to and penetrate host cell membranes. This macromolecular machine resembles a stretched, coiled spring (or sheath) wound around a rigid tube with a spike-shaped protein at its tip. A baseplate structure, which is arguably the most complex part of this assembly, relays the contraction signal to the sheath. Here we present the atomic structure of the approximately 6-megadalton bacteriophage T4 baseplate in its pre- and post-host attachment states and explain the events that lead to sheath contraction in atomic detail. We establish the identity and function of a minimal set of components that is conserved in all contractile injection systems and show that the triggering mechanism is universally conserved.
#2: ジャーナル: J. Mol. Biol. / 年: 2001 タイトル: Crystal structure of a heat and protease-stable part of the bacteriophage T4 short tail fibre. 著者: van Raaij, M.J. / Schoehn, G. / Burda, M.R. / Miller, S.
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: 0.933 Å / 相対比: 1
反射
解像度: 1.9→19.8 Å / Num. obs: 28682 / % possible obs: 92.3 % / 冗長度: 7.3 % / Biso Wilson estimate: 16.12 Å2 / Rmerge(I) obs: 0.057 / Net I/σ(I): 8.5
反射 シェル
解像度: 1.9→2 Å / 冗長度: 5.3 % / Rmerge(I) obs: 0.154 / Mean I/σ(I) obs: 4.8 / % possible all: 68.7
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解析
ソフトウェア
名称
バージョン
分類
MOSFLM
データ削減
SCALA
データスケーリング
SOLVE
位相決定
REFMAC
5.8.0155
精密化
精密化
構造決定の手法: 単一同系置換・異常分散 / 解像度: 1.9→19.8 Å / Cor.coef. Fo:Fc: 0.936 / Cor.coef. Fo:Fc free: 0.901 / SU B: 2.129 / SU ML: 0.064 / 交差検証法: THROUGHOUT / ESU R: 0.116 / ESU R Free: 0.115 / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS