- EMDB-2439: Mechanism of Membranous Tunnelling Nanotube Formation in Viral Ge... -
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基本情報
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データベース: EMDB / ID: EMD-2439
タイトル
Mechanism of Membranous Tunnelling Nanotube Formation in Viral Genome Delivery
マップデータ
This sub-tomogram averaged tube density refers to the average class-2. Before displaying it's better to apply a low-pass filter to 50 Ang and contour at 0.8sigma (where sigma is defined by the threshold level displayed by Chimera over the RMS of the map).
試料
試料: Protruding tube (average class 2) from the lipid-containing bacteriophage PRD1
ジャーナル: Nature / 年: 2004 タイトル: Membrane structure and interactions with protein and DNA in bacteriophage PRD1. 著者: Joseph J B Cockburn / Nicola G A Abrescia / Jonathan M Grimes / Geoffrey C Sutton / Jonathan M Diprose / James M Benevides / George J Thomas / Jaana K H Bamford / Dennis H Bamford / David I Stuart / 要旨: Membranes are essential for selectively controlling the passage of molecules in and out of cells and mediating the response of cells to their environment. Biological membranes and their associated ...Membranes are essential for selectively controlling the passage of molecules in and out of cells and mediating the response of cells to their environment. Biological membranes and their associated proteins present considerable difficulties for structural analysis. Although enveloped viruses have been imaged at about 9 A resolution by cryo-electron microscopy and image reconstruction, no detailed crystallographic structure of a membrane system has been described. The structure of the bacteriophage PRD1 particle, determined by X-ray crystallography at about 4 A resolution, allows the first detailed analysis of a membrane-containing virus. The architecture of the viral capsid and its implications for virus assembly are presented in the accompanying paper. Here we show that the electron density also reveals the icosahedral lipid bilayer, beneath the protein capsid, enveloping the viral DNA. The viral membrane contains about 26,000 lipid molecules asymmetrically distributed between the membrane leaflets. The inner leaflet is composed predominantly of zwitterionic phosphatidylethanolamine molecules, facilitating a very close interaction with the viral DNA, which we estimate to be packaged to a pressure of about 45 atm, factors that are likely to be important during membrane-mediated DNA translocation into the host cell. In contrast, the outer leaflet is enriched in phosphatidylglycerol and cardiolipin, which show a marked lateral segregation within the icosahedral asymmetric unit. In addition, the lipid headgroups show a surprising degree of order.
ダウンロード / ファイル: emd_2439.map.gz / 形式: CCP4 / 大きさ: 422.9 KB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
This sub-tomogram averaged tube density refers to the average class-2. Before displaying it's better to apply a low-pass filter to 50 Ang and contour at 0.8sigma (where sigma is defined by the threshold level displayed by Chimera over the RMS of the map).