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-Structure paper
タイトル | Structural dynamics of bacteriophage P22 infection initiation revealed by cryo-electron tomography. |
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ジャーナル・号・ページ | Nat Microbiol, Vol. 4, Issue 6, Page 1049-1056, Year 2019 |
掲載日 | 2019年3月18日 |
著者 | Chunyan Wang / Jiagang Tu / Jun Liu / Ian J Molineux / |
PubMed 要旨 | For successful infection, bacteriophages must overcome multiple barriers to transport their genome and proteins across the bacterial cell envelope. We use cryo-electron tomography to study the ...For successful infection, bacteriophages must overcome multiple barriers to transport their genome and proteins across the bacterial cell envelope. We use cryo-electron tomography to study the infection initiation of phage P22 in Salmonella enterica serovar Typhimurium, revealing how a channel forms to allow genome translocation into the cytoplasm. Our results show free phages that initially attach obliquely to the cell through interactions between the O antigen and two of the six tailspikes; the tail needle also abuts the cell surface. The virion then orients perpendicularly and the needle penetrates the outer membrane. The needle is released and the internal head protein gp7* is ejected and assembles into an extracellular channel that extends from the gp10 baseplate to the cell surface. A second protein, gp20, is ejected and assembles into a structure that extends the extracellular channel across the outer membrane into the periplasm. Insertion of the third ejected protein, gp16, into the cytoplasmic membrane probably completes the overall trans-envelope channel into the cytoplasm. Construction of a trans-envelope channel is an essential step during infection of Gram-negative bacteria by all short-tailed phages, because such virions cannot directly deliver their genome into the cell cytoplasm. |
リンク | Nat Microbiol / PubMed:30886360 / PubMed Central |
手法 | EM (サブトモグラム平均) |
解像度 | 26.0 - 29.0 Å |
構造データ | EMDB-9006: EMDB-9007: EMDB-9008: EMDB-9009: EMDB-9010: |
由来 |
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