ジャーナル: Nat Commun / 年: 2024 タイトル: A structural and dynamic visualization of the interaction between MAP7 and microtubules. 著者: Agnes Adler / Mamata Bangera / J Wouter Beugelink / Salima Bahri / Hugo van Ingen / Carolyn A Moores / Marc Baldus / 要旨: Microtubules (MTs) are key components of the eukaryotic cytoskeleton and are essential for intracellular organization, organelle trafficking and mitosis. MT tasks depend on binding and interactions ...Microtubules (MTs) are key components of the eukaryotic cytoskeleton and are essential for intracellular organization, organelle trafficking and mitosis. MT tasks depend on binding and interactions with MT-associated proteins (MAPs). MT-associated protein 7 (MAP7) has the unusual ability of both MT binding and activating kinesin-1-mediated cargo transport along MTs. Additionally, the protein is reported to stabilize MTs with its 112 amino-acid long MT-binding domain (MTBD). Here we investigate the structural basis of the interaction of MAP7 MTBD with the MT lattice. Using a combination of solid and solution-state nuclear magnetic resonance (NMR) spectroscopy with electron microscopy, fluorescence anisotropy and isothermal titration calorimetry, we shed light on the binding mode of MAP7 to MTs at an atomic level. Our results show that a combination of interactions between MAP7 and MT lattice extending beyond a single tubulin dimer and including tubulin C-terminal tails contribute to formation of the MAP7-MT complex.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 298 K / 装置: FEI VITROBOT MARK IV 詳細: MAP7 MTBD decorated Taxol stabilized microtubules were applied to a glow discharged grid in a Vitrobot, incubated for 30 seconds at 25 degrees following which excess liquid was blotted off ...詳細: MAP7 MTBD decorated Taxol stabilized microtubules were applied to a glow discharged grid in a Vitrobot, incubated for 30 seconds at 25 degrees following which excess liquid was blotted off and the grid was plunge frozen in liquid ethane..
詳細
Tubulin mixed with GTP was incubated in a water bath maintained at 37 degrees for 1 hour followed by addition of Taxol and further incubation for 3 hours. Taxol stabilized microtubules were pelleted in an ultracentrifuge and resuspended in BRB80 buffer. Polymerized microtubules were incubated with MAP7 MTBD in a water bath maintained at 30 degrees for 10 minutes.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 49.93 e/Å2 詳細: Movies were collected in counting mode fractionated over 50 frames