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-Structure paper
| タイトル | Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer. |
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| ジャーナル・号・ページ | PLoS Biol, Vol. 18, Issue 9, Page e3000827, Year 2020 |
| 掲載日 | 2020年9月30日 |
著者 | Lisa Selzer / Zhaoming Su / Grigore D Pintilie / Wah Chiu / Karla Kirkegaard / ![]() |
| PubMed 要旨 | Matrix proteins are encoded by many enveloped viruses, including influenza viruses, herpes viruses, and coronaviruses. Underneath the viral envelope of influenza virus, matrix protein 1 (M1) forms an ...Matrix proteins are encoded by many enveloped viruses, including influenza viruses, herpes viruses, and coronaviruses. Underneath the viral envelope of influenza virus, matrix protein 1 (M1) forms an oligomeric layer critical for particle stability and pH-dependent RNA genome release. However, high-resolution structures of full-length monomeric M1 and the matrix layer have not been available, impeding antiviral targeting and understanding of the pH-dependent transitions involved in cell entry. Here, purification and extensive mutagenesis revealed protein-protein interfaces required for the formation of multilayered helical M1 oligomers similar to those observed in virions exposed to the low pH of cell entry. However, single-layered helical oligomers with biochemical and ultrastructural similarity to those found in infectious virions before cell entry were observed upon mutation of a single amino acid. The highly ordered structure of the single-layered oligomers and their likeness to the matrix layer of intact virions prompted structural analysis by cryo-electron microscopy (cryo-EM). The resulting 3.4-Å-resolution structure revealed the molecular details of M1 folding and its organization within the single-shelled matrix. The solution of the full-length M1 structure, the identification of critical assembly interfaces, and the development of M1 assembly assays with purified proteins are crucial advances for antiviral targeting of influenza viruses. |
リンク | PLoS Biol / PubMed:32997652 / PubMed Central |
| 手法 | EM (らせん対称) |
| 解像度 | 3.4 Å |
| 構造データ | EMDB-22384, PDB-7jm3: |
| 由来 |
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キーワード | VIRAL PROTEIN / influenza A / virus / matrix layer / M1 protein |
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リンク

Influenza A virus (A/Puerto Rico/8/1934(H1N1)) (A型インフルエンザウイルス)
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