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-Structure paper
タイトル | Acid-stable capsid structure of Helicobacter pylori bacteriophage KHP30 by single-particle cryoelectron microscopy. |
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ジャーナル・号・ページ | Structure, Vol. 30, Issue 2, Page 300-312.e3, Year 2022 |
掲載日 | 2022年2月3日 |
著者 | Ryosuke Kamiya / Jumpei Uchiyama / Shigenobu Matsuzaki / Kazuyoshi Murata / Kenji Iwasaki / Naoyuki Miyazaki / |
PubMed 要旨 | The acid-stable capsid structures of Helicobacter pylori phages KHP30 and KHP40 are solved at 2.7 and 3.0 Å resolutions by cryoelectron microscopy, respectively. The capsids have icosahedral T = 9 ...The acid-stable capsid structures of Helicobacter pylori phages KHP30 and KHP40 are solved at 2.7 and 3.0 Å resolutions by cryoelectron microscopy, respectively. The capsids have icosahedral T = 9 symmetry and consist of each 540 copies of 2 structural proteins, a major capsid protein, and a cement protein. The major capsid proteins form 12 pentagonal capsomeres occupying icosahedral vertexes and 80 hexagonal capsomeres located at icosahedral faces and edges. The major capsid protein has a unique protruding loop extending to the neighboring subunit that stabilizes hexagonal capsomeres. Furthermore, the capsid is decorated with trimeric cement proteins with a jelly roll motif. The cement protein trimer sits on the quasi-three-fold axis formed by three major capsid protein capsomeres, thereby enhancing the particle stability by connecting these capsomeres. Sequence and structure comparisons between the related Helicobacter pylori phages suggest a possible mechanism of phage adaptation to the human gastric environment. |
リンク | Structure / PubMed:34597601 |
手法 | EM (単粒子) |
解像度 | 2.7 - 3.0 Å |
構造データ | EMDB-30778, PDB-7dn2: |
由来 |
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キーワード | VIRUS / CAPSID / PHAGE / PHAGE HEAD / CRYOEM |