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-Structure paper
タイトル | Structures of T7 bacteriophage portal and tail suggest a viral DNA retention and ejection mechanism. |
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ジャーナル・号・ページ | Nat Commun, Vol. 10, Issue 1, Page 3746, Year 2019 |
掲載日 | 2019年8月20日 |
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 / |
PubMed 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. |
リンク | Nat Commun / PubMed:31431626 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 3.33 - 5.8 Å |
構造データ | EMDB-4667: EMDB-4669: Bacteriophage packaging protein EMDB-4706: Bacteriophage ejection complex PDB-6qwp: PDB-6qx5: |
由来 |
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キーワード | VIRAL PROTEIN / DNA packaging / viral complex / DNA ejection |