+検索条件
-Structure paper
タイトル | The pore conformation of lymphocyte perforin. |
---|---|
ジャーナル・号・ページ | Sci Adv, Vol. 8, Issue 6, Page eabk3147, Year 2022 |
掲載日 | 2022年2月11日 |
著者 | Marina E Ivanova / Natalya Lukoyanova / Sony Malhotra / Maya Topf / Joseph A Trapani / Ilia Voskoboinik / Helen R Saibil / |
PubMed 要旨 | Perforin is a pore-forming protein that facilitates rapid killing of pathogen-infected or cancerous cells by the immune system. Perforin is released from cytotoxic lymphocytes, together with ...Perforin is a pore-forming protein that facilitates rapid killing of pathogen-infected or cancerous cells by the immune system. Perforin is released from cytotoxic lymphocytes, together with proapoptotic granzymes, to bind to a target cell membrane where it oligomerizes and forms pores. The pores allow granzyme entry, which rapidly triggers the apoptotic death of the target cell. Here, we present a 4-Å resolution cryo-electron microscopy structure of the perforin pore, revealing previously unidentified inter- and intramolecular interactions stabilizing the assembly. During pore formation, the helix-turn-helix motif moves away from the bend in the central β sheet to form an intermolecular contact. Cryo-electron tomography shows that prepores form on the membrane surface with minimal conformational changes. Our findings suggest the sequence of conformational changes underlying oligomerization and membrane insertion, and explain how several pathogenic mutations affect function. |
リンク | Sci Adv / PubMed:35148176 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.0 Å |
構造データ | EMDB-13269, PDB-7pag: |
化合物 | ChemComp-CA: ChemComp-NAG: |
由来 |
|
キーワード | IMMUNE SYSTEM (免疫系) / Pore forming protein perforin |