Spanish Ministry of Science, Innovation, and Universities
BFU2014-54181
スペイン
Spanish Ministry of Science, Innovation, and Universities
BFU2014-53550-P
スペイン
Spanish Ministry of Science, Innovation, and Universities
BFU2017-83720-P
スペイン
Spanish Ministry of Science, Innovation, and Universities
MDM-2014-0435
スペイン
Spanish Ministry of Science, Innovation, and Universities
SEV-2013-0347
スペイン
Spanish Ministry of Science, Innovation, and Universities
RYC-2011-09071
スペイン
European Commission
653706
引用
ジャーナル: Nat Commun / 年: 2019 タイトル: Structures of T7 bacteriophage portal and tail suggest a viral DNA retention and ejection mechanism. 著者: Ana Cuervo / Montserrat Fàbrega-Ferrer / Cristina Machón / José Javier Conesa / Francisco J Fernández / Rosa Pérez-Luque / Mar Pérez-Ruiz / Joan Pous / M Cristina Vega / José L Carrascosa / Miquel Coll / 要旨: Double-stranded DNA bacteriophages package their genome at high pressure inside a procapsid through the portal, an oligomeric ring protein located at a unique capsid vertex. Once the DNA has been ...Double-stranded DNA bacteriophages package their genome at high pressure inside a procapsid through the portal, an oligomeric ring protein located at a unique capsid vertex. Once the DNA has been packaged, the tail components assemble on the portal to render the mature infective virion. The tail tightly seals the ejection conduit until infection, when its interaction with the host membrane triggers the opening of the channel and the viral genome is delivered to the host cell. Using high-resolution cryo-electron microscopy and X-ray crystallography, here we describe various structures of the T7 bacteriophage portal and fiber-less tail complex, which suggest a possible mechanism for DNA retention and ejection: a portal closed conformation temporarily retains the genome before the tail is assembled, whereas an open portal is found in the tail. Moreover, a fold including a seven-bladed β-propeller domain is described for the nozzle tail protein.
A: Portal protein B: Portal protein C: Portal protein D: Portal protein E: Portal protein F: Portal protein G: Portal protein H: Portal protein I: Portal protein J: Portal protein K: Portal protein L: Portal protein M: Tail tubular protein gp11 N: Tail tubular protein gp11 O: Tail tubular protein gp11 P: Tail tubular protein gp11 Q: Tail tubular protein gp11 R: Tail tubular protein gp11 S: Tail tubular protein gp11 T: Tail tubular protein gp11 U: Tail tubular protein gp11 V: Tail tubular protein gp11 W: Tail tubular protein gp11 X: Tail tubular protein gp11 a: Tail tubular protein gp12 b: Tail tubular protein gp12 c: Tail tubular protein gp12 d: Tail tubular protein gp12 e: Tail tubular protein gp12 f: Tail tubular protein gp12
中空か: NO / エンベロープを持つか: NO / 単離: STRAIN / タイプ: VIRION
緩衝液
pH: 7.8 / 詳細: 50 mM Tris-HCl pH 7.8, 100 mM NaCl, 10 mM MgCl2
緩衝液成分
ID
濃度
式
Buffer-ID
1
100mM
NaCl
1
2
10mM
MgCl2
1
3
50mM
Tris-HCl
1
試料
濃度: 0.8 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: acetone and treated with 0.1% w/v poly-L-Lysine (Sigma) for 1 min in water グリッドの材料: COPPER/RHODIUM / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R2/2
急速凍結
装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 295.15 K