Protein of unknown function DUF5455 / Family of unknown function (DUF5455) / Bacteriophage, G3P, N2-domain superfamily / Attachment protein G3P, N-terminal / Attachment protein G3P, N-terminal domain superfamily / Phage Coat Protein A / Phage major coat protein, Gp8 / Bacteriophage M13, G8P, capsid domain superfamily / Capsid protein G8P 類似検索 - ドメイン・相同性
Attachment protein G3P / Head virion protein G6P / Capsid protein G8P 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Nat Commun / 年: 2023 タイトル: Cryo-EM structure of a bacteriophage M13 mini variant. 著者: Qi Jia / Ye Xiang / 要旨: Filamentous bacteriophages package their circular, single stranded DNA genome with the major coat protein pVIII and the minor coat proteins pIII, pVII, pVI, and pIX. Here, we report the cryo-EM ...Filamentous bacteriophages package their circular, single stranded DNA genome with the major coat protein pVIII and the minor coat proteins pIII, pVII, pVI, and pIX. Here, we report the cryo-EM structure of a ~500 Å long bacteriophage M13 mini variant. The distal ends of the mini phage are sealed by two cap-like complexes composed of the minor coat proteins. The top cap complex consists of pVII and pIX, both exhibiting a single helix structure. Arg33 of pVII and Glu29 of pIX, located on the inner surface of the cap, play a key role in recognizing the genome packaging signal. The bottom cap complex is formed by the hook-like structures of pIII and pVI, arranged in helix barrels. Most of the inner ssDNA genome adopts a double helix structure with a similar pitch to that of the A-form double-stranded DNA. These findings provide insights into the assembly of filamentous bacteriophages.