ジャーナル: J Struct Biol / 年: 2013 タイトル: Specificity of an anti-capsid antibody associated with Hepatitis B Virus-related acute liver failure. 著者: Weimin Wu / Zhaochun Chen / Naiqian Cheng / Norman R Watts / Stephen J Stahl / Patrizia Farci / Robert H Purcell / Paul T Wingfield / Alasdair C Steven / 要旨: Previously, the livers of patients suffering from acute liver failure (ALF), a potentially fatal syndrome arising from infection by Hepatitis B Virus (HBV), were found to contain massive amounts of ...Previously, the livers of patients suffering from acute liver failure (ALF), a potentially fatal syndrome arising from infection by Hepatitis B Virus (HBV), were found to contain massive amounts of an antibody specific for the core antigen (HBcAg) capsid. We have used cryo-electron microscopy and molecular modeling to define its epitope. HBV capsids are icosahedral shells with 25Å-long dimeric spikes, each a 4-helix bundle, protruding from the contiguous "floor". Of the anti-HBcAg antibodies previously characterized, most bind around the spike tip while one binds to the floor. The ALF-associated antibody binds tangentially to a novel site on the side of the spike. This epitope is conformational. The Fab binds with high affinity to its principal determinants but has lower affinities for quasi-equivalent variants. The highest occupancy site is on one side of a spike, with no detectable binding to the corresponding site on the other side. Binding of one Fab per dimer was also observed by analytical ultracentrifugation. The Fab did not bind to the e-antigen dimer, a non-assembling variant of capsid protein. These findings support the propositions that antibodies with particular specificities may correlate with different clinical expressions of HBV infection and that antibodies directed to particular HBcAg epitopes may be involved in ALF pathogenesis.
ダウンロード / ファイル: emd_2046.map.gz / 形式: CCP4 / 大きさ: 29.8 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
3D reconstruction of antibody-decorated Hepatitis B T=4 particle
ボクセルのサイズ
X=Y=Z: 2.457 Å
密度
表面レベル
登録者による: 0.4 / ムービー #1: 0.4
最小 - 最大
-1.45940518 - 6.02104616
平均 (標準偏差)
-0.00000001 (±1.0)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-100
-100
-100
サイズ
200
200
200
Spacing
200
200
200
セル
A=B=C: 491.4 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
2.457
2.457
2.457
M x/y/z
200
200
200
origin x/y/z
0.000
0.000
0.000
length x/y/z
491.400
491.400
491.400
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
-184
-184
-183
NX/NY/NZ
368
368
368
MAP C/R/S
1
2
3
start NC/NR/NS
-100
-100
-100
NC/NR/NS
200
200
200
D min/max/mean
-1.459
6.021
-0.000
-
添付データ
-
試料の構成要素
-
全体 : Antibody E1 to Hepatitis B core antigen
全体
名称: Antibody E1 to Hepatitis B core antigen
要素
試料: Antibody E1 to Hepatitis B core antigen
ウイルス: Hepatitis B virus (B 型肝炎ウイルス)
タンパク質・ペプチド: Antibody E1
-
超分子 #1000: Antibody E1 to Hepatitis B core antigen
超分子
名称: Antibody E1 to Hepatitis B core antigen / タイプ: sample / ID: 1000 詳細: The antibody E1 is derived from two ALF patients. T=4 hepatitis B particle is Cp149.3CA 集合状態: One antibody to one face of the dimer / Number unique components: 1
名称: Antibody E1 / タイプ: protein_or_peptide / ID: 1 / 詳細: Molecular weight is for one copy / 組換発現: Yes
由来(天然)
生物種: Homo sapiens (ヒト) / 別称: Human / 組織: Plasma / 細胞: B-lyphocytes
分子量
理論値: 50 KDa
-
実験情報
-
構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
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: 38 % / チャンバー内温度: 100 K / 装置: OTHER / 手法: Manual plunging
-
電子顕微鏡法
顕微鏡
FEI/PHILIPS CM200FEG
温度
平均: 100 K
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected at 175,000 magnification
日付
2010年7月1日
撮影
カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM デジタル化 - スキャナー: NIKON SUPER COOLSCAN 9000 デジタル化 - サンプリング間隔: 6.35 µm / 実像数: 52 / 平均電子線量: 20 e/Å2 詳細: There are two kinds of particle in each micrograph. T=4 and T=3 Hepatitis B particles. ビット/ピクセル: 16