ジャーナル: J Virol / 年: 2011 タイトル: The herpes simplex virus 1 UL17 protein is the second constituent of the capsid vertex-specific component required for DNA packaging and retention. 著者: Katerina Toropova / Jamie B Huffman / Fred L Homa / James F Conway / 要旨: The herpes simplex virus (HSV) UL17 and UL25 minor capsid proteins are essential for DNA packaging. They are thought to comprise a molecule arrayed in five copies around each of the capsid vertices. ...The herpes simplex virus (HSV) UL17 and UL25 minor capsid proteins are essential for DNA packaging. They are thought to comprise a molecule arrayed in five copies around each of the capsid vertices. This molecule was initially termed the "C-capsid-specific component" (CCSC) (B. L. Trus et al., Mol. Cell 26:479-489, 2007), but as we have subsequently observed this feature on reconstructions of A, B, and C capsids, we now refer to it more generally as the "capsid vertex-specific component" (CVSC) (S. K. Cockrell et al., J. Virol. 85:4875-4887, 2011). We previously confirmed that UL25 occupies the vertex-distal region of the CVSC density by visualizing a large UL25-specific tag in reconstructions calculated from cryo-electron microscopy (cryo-EM) images. We have pursued the same strategy to determine the capsid location of the UL17 protein. Recombinant viruses were generated that contained either a small tandem affinity purification (TAP) tag or the green fluorescent protein (GFP) attached to the C terminus of UL17. Purification of the TAP-tagged UL17 or a similarly TAP-tagged UL25 protein clearly demonstrated that the two proteins interact. A cryo-EM reconstruction of capsids containing the UL17-GFP protein reveals that UL17 is the second component of the CVSC and suggests that UL17 interfaces with the other CVSC component, UL25, through its C terminus. The portion of UL17 nearest the vertex appears to be poorly constrained, which may provide flexibility in interacting with tegument proteins or the DNA-packaging machinery at the portal vertex. The exposed locations of the UL17 and UL25 proteins on the HSV-1 capsid exterior suggest that they may be attractive targets for highly specific antivirals.
全体 : HSV-1 C-capsid with UL17 protein labeled with GFP at its C terminus.
全体
名称: HSV-1 C-capsid with UL17 protein labeled with GFP at its C terminus.
要素
試料: HSV-1 C-capsid with UL17 protein labeled with GFP at its C terminus.
ウイルス: Human herpesvirus 1 strain KOS (ヘルペスウイルス)
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超分子 #1000: HSV-1 C-capsid with UL17 protein labeled with GFP at its C terminus.
超分子
名称: HSV-1 C-capsid with UL17 protein labeled with GFP at its C terminus. タイプ: sample / ID: 1000 / Number unique components: 1
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超分子 #1: Human herpesvirus 1 strain KOS
超分子
名称: Human herpesvirus 1 strain KOS / タイプ: virus / ID: 1 / Name.synonym: HSV-1 / NCBI-ID: 10306 / 生物種: Human herpesvirus 1 strain KOS / ウイルスタイプ: VIRION / ウイルス・単離状態: STRAIN / ウイルス・エンベロープ: No / ウイルス・中空状態: No / Syn species name: HSV-1
宿主
生物種: Homo sapiens (ヒト) / 別称: VERTEBRATES
ウイルス殻
Shell ID: 1 / 直径: 1250 Å / T番号(三角分割数): 16
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実験情報
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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
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試料調製
緩衝液
pH: 7.5 / 詳細: 500 mM NaCl, 10 mM Tris, 1 mM EDTA
凍結
凍結剤: OTHER / チャンバー内湿度: 85 % / 装置: FEI VITROBOT MARK III 詳細: Vitrification instrument: Vitrobot mark III. Cryogen was an equal mix of ethane - propane 手法: 7 second blot before plunging
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電子顕微鏡法
顕微鏡
FEI TECNAI F20
日付
2010年9月3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: 134 / ビット/ピクセル: 8