ジャーナル: Proc Natl Acad Sci U S A / 年: 2010 タイトル: Structural organization of a filamentous influenza A virus. 著者: Lesley J Calder / Sebastian Wasilewski / John A Berriman / Peter B Rosenthal / 要旨: Influenza is a lipid-enveloped, pleomorphic virus. We combine electron cryotomography and analysis of images of frozen-hydrated virions to determine the structural organization of filamentous ...Influenza is a lipid-enveloped, pleomorphic virus. We combine electron cryotomography and analysis of images of frozen-hydrated virions to determine the structural organization of filamentous influenza A virus. Influenza A/Udorn/72 virions are capsule-shaped or filamentous particles of highly uniform diameter. We show that the matrix layer adjacent to the membrane is an ordered helix of the M1 protein and its close interaction with the surrounding envelope determines virion morphology. The ribonucleoprotein particles (RNPs) that package the genome segments form a tapered assembly at one end of the virus interior. The neuraminidase, which is present in smaller numbers than the hemagglutinin, clusters in patches and are typically present at the end of the virion opposite to RNP attachment. Incubation of virus at low pH causes a loss of filamentous morphology, during which we observe a structural transition of the matrix layer from its helical, membrane-associated form to a multilayered coil structure inside the virus particle. The polar organization of the virus provides a model for assembly of the virion during budding at the host membrane. Images and tomograms of A/Aichi/68 X-31 virions show the generality of these conclusions to non-filamentous virions.
ダウンロード / ファイル: emd_3287.map.gz / 形式: CCP4 / 大きさ: 1001 KB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Reconstruction of trailing tips from influenza A virions.
ボクセルのサイズ
X=Y=Z: 10 Å
密度
表面レベル
登録者による: 0.52 / ムービー #1: 0.52
最小 - 最大
-3.14941382 - 2.12140012
平均 (標準偏差)
0.01397126 (±0.27022281)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-32
-32
-32
サイズ
64
64
64
Spacing
64
64
64
セル
A=B=C: 640.0 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
10
10
10
M x/y/z
64
64
64
origin x/y/z
0.000
0.000
0.000
length x/y/z
640.000
640.000
640.000
α/β/γ
90.000
90.000
90.000
MAP C/R/S
1
2
3
start NC/NR/NS
-32
-32
-32
NC/NR/NS
64
64
64
D min/max/mean
-3.149
2.121
0.014
-
添付データ
-
試料の構成要素
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全体 : Trailing tips of filamentous influenza A virions, showing M1 and ...
全体
名称: Trailing tips of filamentous influenza A virions, showing M1 and parts of the viral ribonucleoprotein
要素
試料: Trailing tips of filamentous influenza A virions, showing M1 and parts of the viral ribonucleoprotein
ウイルス: Influenza A virus (A型インフルエンザウイルス)
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超分子 #1000: Trailing tips of filamentous influenza A virions, showing M1 and ...
超分子
名称: Trailing tips of filamentous influenza A virions, showing M1 and parts of the viral ribonucleoprotein タイプ: sample / ID: 1000 / Number unique components: 1
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超分子 #1: Influenza A virus
超分子
名称: Influenza A virus / タイプ: virus / ID: 1 / Name.synonym: Influenza virus 詳細: Reconstruction of the inner layer of the viral envelope from trailing tips of native virions of mixed A/Aichi/X31 and A/Udorn strains. Map is Gaussian filtered to 7.6 nm the 0.5 FSC. Reconstructed in EMAN2. NCBI-ID: 11320 / 生物種: Influenza A virus / ウイルスタイプ: VIRION / ウイルス・単離状態: OTHER / ウイルス・エンベロープ: Yes / ウイルス・中空状態: No / Syn species name: Influenza virus
宿主
生物種: Homo sapiens (ヒト) / 株: Combined A/Aichi/2/68 and A/Udorn/307/72 / 別称: VERTEBRATES
Host system
生物種: Homo sapiens (ヒト) / 組換細胞: MDCK
ウイルス殻
Shell ID: 1 / 名称: M1
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実験情報
-
構造解析
手法
クライオ電子顕微鏡法
解析
サブトモグラム平均法
試料の集合状態
particle
-
試料調製
凍結
凍結剤: ETHANE / チャンバー内湿度: 90 % / 装置: FEI VITROBOT MARK III 詳細: Details for EM and reconstruction published in Calder et al., Proc Natl Acad Sci U S A. 2010 Jun 8; 107(23): 10685 to 10690. 手法: Blotted 4s before plunging