+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7l0x | ||||||
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タイトル | Human Bocavirus 2 (pH 2.6) | ||||||
要素 | VP2 | ||||||
キーワード | VIRUS / Icosahedral Capsid / Human Bocavirus 2 / HBoV2 / Parvovirus | ||||||
機能・相同性 | Parvovirus coat protein VP2 / Parvovirus coat protein VP1/VP2 / Parvovirus coat protein VP2 / Capsid/spike protein, ssDNA virus / T=1 icosahedral viral capsid / structural molecule activity / VP2 機能・相同性情報 | ||||||
生物種 | Human bocavirus 2 (ウイルス) | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.51 Å | ||||||
データ登録者 | Luo, M. / Mietzsch, M. / Agbandje-McKenna, M. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: J Virol / 年: 2021 タイトル: pH-Induced Conformational Changes of Human Bocavirus Capsids. 著者: Mengxiao Luo / Mario Mietzsch / Paul Chipman / Kangkang Song / Chen Xu / John Spear / Duncan Sousa / Robert McKenna / Maria Söderlund-Venermo / Mavis Agbandje-McKenna / 要旨: Human bocavirus 1 (HBoV1) and HBoV2-4 infect children and immunocompromised individuals, resulting in respiratory and gastrointestinal infections, respectively. Using cryo-electron microscopy and ...Human bocavirus 1 (HBoV1) and HBoV2-4 infect children and immunocompromised individuals, resulting in respiratory and gastrointestinal infections, respectively. Using cryo-electron microscopy and image reconstruction, the HBoV2 capsid structure was determined to 2.7 Å resolution at pH 7.4 and compared to the previously determined HBoV1, HBoV3, and HBoV4 structures. Consistent with previous findings, surface variable region (VR) III of the capsid protein VP3, proposed as a host tissue-tropism determinant, was structurally similar among the gastrointestinal strains HBoV2-4, but differed from HBoV1 with its tropism for the respiratory tract. Towards understanding the entry and trafficking properties of these viruses, HBoV1 and HBoV2 were further analyzed as species representatives of the two HBoV tropisms. Their cell surface glycan-binding characteristics were analyzed, and capsid structures determined to 2.5-2.7 Å resolution at pH 5.5 and 2.6, conditions normally encountered during infection. The data showed that glycans with terminal sialic acid, galactose, GlcNAc or heparan sulfate moieties do not facilitate HBoV1 or HBoV2 cellular attachment. With respect to trafficking, conformational changes common to both viruses were observed at low pH conditions localized to the VP N-terminus under the 5-fold channel, in the surface loops VR-I and VR-V and specific side-chain residues such as cysteines and histidines. The 5-fold conformational movements provide insight into the potential mechanism of VP N-terminal dynamics during HBoV infection and side-chain modifications highlight pH-sensitive regions of the capsid. Human bocaviruses (HBoVs) are associated with disease in humans. However, the lack of an animal model and a versatile cell culture system to study their life cycle limits the ability to develop specific treatments or vaccines. This study presents the structure of HBoV2, at 2.7 Å resolution, determined for comparison to the existing HBoV1, HBoV3, and HBoV4 structures, to enable the molecular characterization of strain and genus-specific capsid features contributing to tissue tropism and antigenicity. Furthermore, HBoV1 and HBoV2 structures determined under acidic conditions provide insight into capsid changes associated with endosomal and gastrointestinal acidification. Structural rearrangements of the capsid VP N-terminus, at the base of the 5-fold channel, demonstrate a disordering of a "basket" motif as pH decreases. These observations begin to unravel the molecular mechanism of HBoV infection and provide information for control strategies. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7l0x.cif.gz | 5.1 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7l0x.ent.gz | 表示 | PDB形式 | |
PDBx/mmJSON形式 | 7l0x.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 7l0x_validation.pdf.gz | 1.2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7l0x_full_validation.pdf.gz | 1.2 MB | 表示 | |
XML形式データ | 7l0x_validation.xml.gz | 633.5 KB | 表示 | |
CIF形式データ | 7l0x_validation.cif.gz | 1023.9 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/l0/7l0x ftp://data.pdbj.org/pub/pdb/validation_reports/l0/7l0x | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 58364.078 Da / 分子数: 60 / 断片: UNP residues 33-538 / 由来タイプ: 組換発現 / 由来: (組換発現) Human bocavirus 2 (ウイルス) / 遺伝子: VP2 / 細胞株 (発現宿主): Sf9 発現宿主: Spodoptera frugiperda (ツマジロクサヨトウ) 参照: UniProt: B9UYL6 |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: Human bocavirus 2 / タイプ: VIRUS / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: Human bocavirus 2 (ウイルス) |
由来(組換発現) | 生物種: Spodoptera frugiperda (ツマジロクサヨトウ) 細胞: Sf9 |
ウイルスについての詳細 | 中空か: NO / エンベロープを持つか: NO / 単離: OTHER / タイプ: VIRION |
緩衝液 | pH: 5.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
-電子顕微鏡撮影
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / Cs: 2.7 mm |
撮影 | 電子線照射量: 64 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.10-2155_2155: / 分類: 精密化 | ||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.51 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 19648 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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