9CRW

Crystal structure of the Candida albicans kinesin-8 proximal tail domain

9CRW の概要

• エントリーDOI: 10.2210/pdb9crw/pdb
• 分子名称: Kinesin-like protein (1 entity in total)
• 機能のキーワード: kinesin-8, microtubule, tail domain, tubulin, atpase, mitosis, mitotic spindle, stalk domain, motor protein
• 由来する生物種: Candida albicans
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 218374.53

構造登録者

Trofimova, D.,Doubleday, C.,Hunter, B.,Serrano Arevalo, J.,Davison, E.,Wen, E.,Munro, K.,Allingham, J.S. (登録日: 2024-07-22, 公開日: 2024-09-04, 最終更新日: 2025-12-17)

主引用文献

Trofimova, D.,Doubleday, C.,Hunter, B.,Serrano Arevalo, J.D.,Davison, E.,Wen, E.,Munro, K.,Allingham, J.S.
Fungal kinesin-8 motors dimerize by folding their proximal tail domain into a compact helical bundle.
Structure, 33:2122-, 2025

PubMed Abstract: Kinesin-8 motors regulate kinetochore-microtubule dynamics and control spindle length and positioning. Certain isoforms achieve this by traversing microtubules, accumulating at plus-ends, and depolymerizing terminal αβ-tubulin subunits. While the kinesin-8 motor domain is well characterized, the tail domain regions are less understood. Using the Candida albicans Kip3 protein as a model for fungal kinesin-8, we present an X-ray crystal structure and hydrodynamic analysis of its motor-proximal tail segment, revealing its role in motor dimerization. This segment forms a compact, 92 Å-long four-helix bundle, rather than an elongated coiled-coil stalk seen in most kinesins. The bundle is stabilized primarily by interactions between helices one and three, with additional support from helices two and four. A flexible hinge bisects the bundle into two lobules, imparting mechanical pliability and asymmetric exterior surfaces. These unique features may facilitate interactions with regulatory elements or contribute to the functional versatility of kinesin-8 motors.

PubMed: 40907488
DOI: 10.1016/j.str.2025.08.011

実験手法

X-RAY DIFFRACTION (2.49 Å)