+検索条件
-Structure paper
タイトル | Structure of the Cag type IV secretion system. |
---|---|
ジャーナル・号・ページ | Elife, Vol. 8, Year 2019 |
掲載日 | 2019年6月18日 |
著者 | Jeong Min Chung / Michael J Sheedlo / Anne M Campbell / Neha Sawhney / Arwen E Frick-Cheng / Dana Borden Lacy / Timothy L Cover / Melanie D Ohi / |
PubMed 要旨 | Bacterial type IV secretion systems (T4SSs) are molecular machines that can mediate interbacterial DNA transfer through conjugation and delivery of effector molecules into host cells. The Cag T4SS ...Bacterial type IV secretion systems (T4SSs) are molecular machines that can mediate interbacterial DNA transfer through conjugation and delivery of effector molecules into host cells. The Cag T4SS translocates CagA, a bacterial oncoprotein, into gastric cells, contributing to gastric cancer pathogenesis. We report the structure of a membrane-spanning Cag T4SS assembly, which we describe as three sub-assemblies: a 14-fold symmetric outer membrane core complex (OMCC), 17-fold symmetric periplasmic ring complex (PRC), and central stalk. Features that differ markedly from those of prototypical T4SSs include an expanded OMCC and unexpected symmetry mismatch between the OMCC and PRC. This structure is one of the largest bacterial secretion system assemblies ever reported and illustrates the remarkable structural diversity that exists among bacterial T4SSs. |
リンク | Elife / PubMed:31210639 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.5 - 5.4 Å |
構造データ | EMDB-20020: Reconstruction of a T4SS OMCC EMDB-20021, PDB-6odj: EMDB-20022: EMDB-20023: |
由来 |
|
キーワード | TRANSLOCASE / T4SS / Secretion / H. pylori |