HAUS augmin like complex subunit 6 L homeolog / HAUS augmin like complex subunit 7 S homeolog / Tubulin alpha-1B chain / HAUS augmin-like complex subunit 8 / Tubulin beta-2B chain 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
F32 GM142149
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
K99 GM152794
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R01 GM138854
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R01 GM141100
米国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: How augmin establishes the angle of the microtubule branch site. 著者: Sophie M Travis / Jodi Kraus / Collin T McManus / Kiana Golden / Rui Zhang / Sabine Petry / 要旨: How microtubules (MTs) are generated in the proper orientation is essential to understanding how the cytoskeleton organizes a cell and MT-dependent events such as cell division. In the spindle, most ...How microtubules (MTs) are generated in the proper orientation is essential to understanding how the cytoskeleton organizes a cell and MT-dependent events such as cell division. In the spindle, most MTs are generated through the branching MT nucleation pathway. In this pathway, new MTs are nucleated from the side of existing MTs and oriented at a shallow angle by the branching factor augmin, ensuring that both MTs have the same polarity. Yet, how augmin binds MTs and sets the branch angle has remained unclear. Here, we report the cryo-electron microscopy structure of an augmin subcomplex on the MT. This structure resembles that of NDC80 bound to the MT, with the conserved CH domain of augmin's Haus6 subunit directly proximal to the MT lattice. We find that the Haus6 CH domain is a bona fide MT binding site that increases augmin's affinity for the MT and helps establish branch angle. A second binding site, located in the disordered N-terminus of Haus8, also establishes branch angle,. Thus, we find that augmin regulates MT branching using two domains, each tuned to modulate MT affinity and MT branch angle. This work expands our mechanistic understanding of branching MT nucleation and thus spindle formation.
モデルのタイプ: OTHER 詳細: Both 13-protofilament and 14-protofilament reference models were given, as detailed in Valdez et al 2023 DOI: 10.1101/2023.12.18.571906