ジャーナル: Virology / 年: 2011 タイトル: The structure of avian polyomavirus reveals variably sized capsids, non-conserved inter-capsomere interactions, and a possible location of the minor capsid protein VP4. 著者: Peter S Shen / Dirk Enderlein / Christian D S Nelson / Weston S Carter / Masaaki Kawano / Li Xing / Robert D Swenson / Norman H Olson / Timothy S Baker / R Holland Cheng / Walter J Atwood / ...著者: Peter S Shen / Dirk Enderlein / Christian D S Nelson / Weston S Carter / Masaaki Kawano / Li Xing / Robert D Swenson / Norman H Olson / Timothy S Baker / R Holland Cheng / Walter J Atwood / Reimar Johne / David M Belnap / 要旨: Avian polyomavirus (APV) causes a fatal, multi-organ disease among several bird species. Using cryogenic electron microscopy and other biochemical techniques, we investigated the structure of APV and ...Avian polyomavirus (APV) causes a fatal, multi-organ disease among several bird species. Using cryogenic electron microscopy and other biochemical techniques, we investigated the structure of APV and compared it to that of mammalian polyomaviruses, particularly JC polyomavirus and simian virus 40. The structure of the pentameric major capsid protein (VP1) is mostly conserved; however, APV VP1 has a unique, truncated C-terminus that eliminates an intercapsomere-connecting β-hairpin observed in other polyomaviruses. We postulate that the terminal β-hairpin locks other polyomavirus capsids in a stable conformation and that absence of the hairpin leads to the observed capsid size variation in APV. Plug-like density features were observed at the base of the VP1 pentamers, consistent with the known location of minor capsid proteins VP2 and VP3. However, the plug density is more prominent in APV and may include VP4, a minor capsid protein unique to bird polyomaviruses.
pH: 7.4 / 詳細: 10 mM Tris, 50 mM NaCl, 0.01 mM CaCl2
グリッド
詳細: 200 mesh copper grid (holey carbon)
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 89 K / 装置: OTHER 詳細: Vitrification instrument: Vitrobot. vitrification carried out in nitrogen atmosphere 手法: 3 second blot before plunging
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電子顕微鏡法
顕微鏡
FEI TECNAI F30
温度
最低: 88 K / 最高: 95 K / 平均: 90 K
アライメント法
Legacy - 非点収差: astigmatism was corrected at 59,000 times magnification
日付
2007年4月23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: 50 / 詳細: Micrographs digitized in positive contrast mode. / ビット/ピクセル: 16