9C6S

18-mer blood cell-specific tubulin in complex with Cryptophycin-52

9C6S の概要

• エントリーDOI: 10.2210/pdb9c6s/pdb
• EMDBエントリー: 45265
• 分子名称: Detyrosinated tubulin alpha-1A chain, Tubulin beta-6 chain, GUANOSINE-5'-TRIPHOSPHATE, ... (5 entities in total)
• 機能のキーワード: tbb6_chick, cryptophycin-52, hematopoietic, tubb1, beta-6 tubulin chain, class vi, anticancer, cell cycle
• 由来する生物種: Gallus gallus (chicken); 詳細
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 918229.45

構造登録者

Montecinos, F. (登録日: 2024-06-08, 公開日: 2025-01-01, 最終更新日: 2025-05-14)

主引用文献

Montecinos, F.,Eren, E.,Watts, N.R.,Sackett, D.L.,Wingfield, P.T.
Structure of blood cell-specific tubulin and demonstration of dimer spacing compaction in a single protofilament.
J.Biol.Chem., 301:108132-108132, 2024

PubMed Abstract: Microtubule (MT) function plasticity originates from its composition of α- and β-tubulin isotypes and the posttranslational modifications of both subunits. Aspects such as MT assembly dynamics, structure, and anticancer drug binding can be modulated by αβ-tubulin heterogeneity. However, the exact molecular mechanism regulating these aspects is only partially understood. A recent insight is the discovery of expansion and compaction of the MT lattice, which can occur via fine modulation of dimer longitudinal spacing mediated by GTP hydrolysis, taxol binding, protein binding, or isotype composition. Here, we report the first structure of the blood cell-specific α1/β1-tubulin isolated from the marginal band of chicken erythrocytes (ChET) determined to a resolution of 3.2 Å by cryo-EM. We show that ChET rings induced with cryptophycin-52 (Cp-52) are smaller in diameter than HeLa cell line tubulin (HeLaT) rings induced with Cp-52 and composed of the same number of heterodimers. We observe compacted interdimer and intradimer curved protofilament interfaces, characterized by shorter distances between ChET subunits and accompanied by conformational changes in the β-tubulin subunit. The compacted ChET interdimer interface brings more residues near the Cp-52 binding site. We measured the Cp-52 apparent binding affinities of ChET and HeLaT by mass photometry, observing small differences, and detected the intermediates of the ring assembly reaction. These findings demonstrate that compaction/expansion of dimer spacing can occur in a single protofilament context and that the subtle structural differences between tubulin isotypes can modulate tubulin small molecule binding.

PubMed: 39725029
DOI: 10.1016/j.jbc.2024.108132

実験手法

ELECTRON MICROSCOPY (3.52 Å)