9DI0

Cryo-EM structure of Kif18A bound to a microtubule

9DI0 の概要

• エントリーDOI: 10.2210/pdb9di0/pdb
• EMDBエントリー: 46894
• 分子名称: Kinesin-like protein KIF18A, Methylated-DNA--protein-cysteine methyltransferase chimera, Tubulin beta chain, Tubulin alpha-1B chain, ... (8 entities in total)
• 機能のキーワード: kif18a, tubulin, k-fiber, mitosis, spindle, protein binding
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 164418.00

構造登録者

Perez-Bertoldi, J.M.,Nogales, E. (登録日: 2024-09-04, 公開日: 2025-07-16)

主引用文献

Perez-Bertoldi, J.M.,Zhao, Y.,Thawani, A.,Yildiz, A.,Nogales, E.
HURP regulates Kif18A recruitment and activity to synergistically control microtubule dynamics.
Nat Commun, 15:9687-9687, 2024

PubMed Abstract: During mitosis, microtubule dynamics are regulated to ensure proper alignment and segregation of chromosomes. The dynamics of kinetochore-attached microtubules are regulated by hepatoma-upregulated protein (HURP) and the mitotic kinesin-8 Kif18A, but the underlying mechanism remains elusive. Using single-molecule imaging in vitro, we demonstrate that Kif18A motility is regulated by HURP. While sparse decoration of HURP activates the motor, higher concentrations hinder processive motility. To shed light on this behavior, we determine the binding mode of HURP to microtubules using cryo-EM. The structure helps rationalize why HURP functions as a microtubule stabilizer. Additionally, HURP partially overlaps with the microtubule-binding site of the Kif18A motor domain, indicating that excess HURP inhibits Kif18A motility by steric exclusion. We also observe that HURP and Kif18A function together to suppress dynamics of the microtubule plus-end, providing a mechanistic basis for how they collectively serve in microtubule length control.

PubMed: 39516196
DOI: 10.1038/s41467-024-53691-7

実験手法

ELECTRON MICROSCOPY (3.1 Å)