+検索条件
-Structure paper
| タイトル | In situ structure of a bacterial flagellar motor at subnanometre resolution reveals adaptations for increased torque. |
|---|---|
| ジャーナル・号・ページ | Nat Microbiol, Vol. 10, Issue 7, Page 1723-1740, Year 2025 |
| 掲載日 | 2025年7月1日 |
著者 | Tina Drobnič / Eli J Cohen / Thomas Calcraft / Mona Alzheimer / Kathrin Froschauer / Sarah Svensson / William H Hoffmann / Nanki Singh / Sriram G Garg / Louie D Henderson / Trishant R Umrekar / Andrea Nans / Deborah Ribardo / Francesco Pedaci / Ashley L Nord / Georg K A Hochberg / David R Hendrixson / Cynthia M Sharma / Peter B Rosenthal / Morgan Beeby / ![]() |
| PubMed 要旨 | The bacterial flagellar motor, which spins a helical propeller for propulsion, has undergone evolutionary diversification across bacterial species, often involving the addition of structures ...The bacterial flagellar motor, which spins a helical propeller for propulsion, has undergone evolutionary diversification across bacterial species, often involving the addition of structures associated with increasing torque for motility in viscous environments. Understanding how such structures function and have evolved is hampered by challenges in visualizing motors in situ. Here we developed a Campylobacter jejuni minicell system for in situ cryogenic electron microscopy imaging and single-particle analysis of its motor, one of the most complex flagellar motors known, to subnanometre resolution. Focusing on the large periplasmic structures which are essential for increasing torque, our structural data, interpreted with molecular models, show that the basal disk comprises concentric rings of FlgP. The medial disk is a lattice of PflC with PflD, while the proximal disk is a rim of PflB attached to spokes of PflA. PflAB dimerization is essential for proximal disk assembly, recruiting FliL to scaffold more stator complexes at a wider radius which increases torque. We also acquired insights into universal principles of flagellar torque generation. This in situ approach is broadly applicable to other membrane-residing bacterial molecular machines. |
リンク | Nat Microbiol / PubMed:40595286 / PubMed Central |
| 手法 | EM (単粒子) / EM (サブトモグラム平均) |
| 解像度 | 7.9 - 81.0 Å |
| 構造データ | ![]() EMDB-16723: Wild-type Campylobacter jejuni flagellar motor, in situ EMDB-16724: Periplasmic scaffold of the Campylobacter jejuni flagellar motor ![]() EMDB-17415: Campylobacter jejuni flagellar motor, pflC deletion ![]() EMDB-17416: Campylobacter jejuni flagellar motor, pflD deletion ![]() EMDB-17417: Campylobacter jejuni flagellar motor, truncated PflA (d16-168) ![]() EMDB-17419: Campylobacter jejuni flagellar motor, FlgQ-mCherry fusion |
| 由来 |
|
キーワード | STRUCTURAL PROTEIN / molecular machines / flagellar motor / molecular evolution / in situ / scaffold / MOTOR PROTEIN |
ムービー
コントローラー
構造ビューア
万見文献について



著者

リンク







キーワード