National Natural Science Foundation of China (NSFC)
U19A2020
中国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: Cryo-EM structure of cyanopodophage A4 reveals a pentameric pre-ejectosome in the double-stabilized capsid. 著者: Pu Hou / Rui-Qian Zhou / Yong-Liang Jiang / Rong-Cheng Yu / Kang Du / Nanqin Gan / Fei Ke / Qi-Ya Zhang / Qiong Li / Cong-Zhao Zhou / 要旨: Upon infection, the podophages usually eject a couple of proteins from the capsid to form a transmembrane ejectosome on the host cell membrane that facilitates the ejection of viral genome. However, ...Upon infection, the podophages usually eject a couple of proteins from the capsid to form a transmembrane ejectosome on the host cell membrane that facilitates the ejection of viral genome. However, it remains unclear how these proteins of pre-ejectosome are finely assembled at the center of highly packaged genome. Here, we report the intact structure of cyanopodophage A4, which consists of a capsid stabilized by two types of cement proteins and a short tail attached with six tail fibers. Notably, we find a pentameric pre-ejectosome at the core of capsid, which is composed of four ejection proteins wrapped into a coaxial cylinder of triple layers. Moreover, a segment of genomic DNA runs along the positively charged circular cleft formed by two ejection proteins. Based on the mortise-and-tenon architecture of pre-ejectosome in combination with previous studies, we propose a putative DNA packaging process and ejection mechanism for podophages. These findings largely enrich our knowledge on the assembly mechanism of podophages, which might facilitate the application of A4 as a chassis cyanophage in synthetic biology.
履歴
登録
2024年10月10日
登録サイト: PDBJ / 処理サイト: PDBJ
改定 1.0
2025年4月9日
Provider: repository / タイプ: Initial release
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2025年4月9日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
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2025年4月9日
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2025年4月9日
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2025年4月9日
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2025年4月9日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name
A: Major capsid protein B: Major capsid protein C: Major capsid protein D: Major capsid protein E: Major capsid protein F: Major capsid protein G: Major capsid protein Z: Plastocyanin-like domain-containing protein a: Major cement b: Major cement c: Major cement d: Major cement e: Major cement f: Major cement g: Major cement
A: Major capsid protein B: Major capsid protein C: Major capsid protein D: Major capsid protein E: Major capsid protein F: Major capsid protein G: Major capsid protein Z: Plastocyanin-like domain-containing protein a: Major cement b: Major cement c: Major cement d: Major cement e: Major cement f: Major cement g: Major cement
A: Major capsid protein B: Major capsid protein C: Major capsid protein D: Major capsid protein E: Major capsid protein F: Major capsid protein G: Major capsid protein Z: Plastocyanin-like domain-containing protein a: Major cement b: Major cement c: Major cement d: Major cement e: Major cement f: Major cement g: Major cement
x 5
icosahedral pentamer
1.77 MDa, 75 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
1,767,912
75
ポリマ-
1,767,912
75
非ポリマー
0
0
水
0
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
point symmetry operation
4
4
A: Major capsid protein B: Major capsid protein C: Major capsid protein D: Major capsid protein E: Major capsid protein F: Major capsid protein G: Major capsid protein Z: Plastocyanin-like domain-containing protein a: Major cement b: Major cement c: Major cement d: Major cement e: Major cement f: Major cement g: Major cement