8TJ2

CryoEM structure of Myxococcus xanthus type IV pilus

8TJ2 の概要

• エントリーDOI: 10.2210/pdb8tj2/pdb
• EMDBエントリー: 41298
• 分子名称: Type IV major pilin protein PilA (1 entity in total)
• 機能のキーワード: filament, helical reconstruction, cryoem, cell adhesion
• 由来する生物種: Myxococcus xanthus DK 1622
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 394781.72

構造登録者

Zheng, W.,Egelman, E.H. (登録日: 2023-07-20, 公開日: 2023-08-09, 最終更新日: 2024-10-23)

主引用文献

Treuner-Lange, A.,Zheng, W.,Viljoen, A.,Lindow, S.,Herfurth, M.,Dufrene, Y.F.,Sogaard-Andersen, L.,Egelman, E.H.
Tight-packing of large pilin subunits provides distinct structural and mechanical properties for the Myxococcus xanthus type IVa pilus.
Proc.Natl.Acad.Sci.USA, 121:e2321989121-e2321989121, 2024

PubMed Abstract: Type IVa pili (T4aP) are ubiquitous cell surface filaments important for surface motility, adhesion to surfaces, DNA uptake, biofilm formation, and virulence. T4aP are built from thousands of copies of the major pilin subunit and tipped by a complex composed of minor pilins and in some systems also the PilY1 adhesin. While major pilins of structurally characterized T4aP have lengths of <165 residues, the major pilin PilA of is unusually large with 208 residues. All major pilins have a conserved N-terminal domain and a variable C-terminal domain, and the additional residues of PilA are due to a larger C-terminal domain. We solved the structure of the T4aP (T4aP) at a resolution of 3.0 Å using cryo-EM. The T4aP follows the structural blueprint of other T4aP with the pilus core comprised of the interacting N-terminal α1-helices, while the globular domains decorate the T4aP surface. The atomic model of PilA built into this map shows that the large C-terminal domain has more extensive intersubunit contacts than major pilins in other T4aP. As expected from these greater contacts, the bending and axial stiffness of the T4aP is significantly higher than that of other T4aP and supports T4aP-dependent motility on surfaces of different stiffnesses. Notably, T4aP variants with interrupted intersubunit interfaces had decreased bending stiffness, pilus length, and strongly reduced motility. These observations support an evolutionary scenario whereby the large major pilin enables the formation of a rigid T4aP that expands the environmental conditions in which the T4aP system functions.

PubMed: 38625941
DOI: 10.1073/pnas.2321989121

実験手法

ELECTRON MICROSCOPY (3 Å)