ジャーナル: Nat Commun / 年: 2024 タイトル: CryoET reveals actin filaments within platelet microtubules. 著者: Chisato Tsuji / Marston Bradshaw / Megan F Allen / Molly L Jackson / Judith Mantell / Ufuk Borucu / Alastair W Poole / Paul Verkade / Ingeborg Hers / Danielle M Paul / Mark P Dodding / 要旨: Crosstalk between the actin and microtubule cytoskeletons is important for many cellular processes. Recent studies have shown that microtubules and F-actin can assemble to form a composite structure ...Crosstalk between the actin and microtubule cytoskeletons is important for many cellular processes. Recent studies have shown that microtubules and F-actin can assemble to form a composite structure where F-actin occupies the microtubule lumen. Whether these cytoskeletal hybrids exist in physiological settings and how they are formed is unclear. Here, we show that the short-crossover Class I actin filament previously identified inside microtubules in human HAP1 cells is cofilin-bound F-actin. Lumenal F-actin can be reconstituted in vitro, but cofilin is not essential. Moreover, actin filaments with both cofilin-bound and canonical morphologies reside within human platelet microtubules under physiological conditions. We propose that stress placed upon the microtubule network during motor-driven microtubule looping and sliding may facilitate the incorporation of actin into microtubules.
想定した対称性 - らせんパラメータ - Δz: 27.5 Å 想定した対称性 - らせんパラメータ - ΔΦ: 162 ° 想定した対称性 - らせんパラメータ - 軸対称性: C1 (非対称) 解像度のタイプ: BY AUTHOR / 解像度: 20.0 Å / 解像度の算出法: OTHER 詳細: A sub-volume containing the filament was extracted from a tomogram, which was then 2D projected. The projected image was used for real space helical reconstruction to create the map. ...詳細: A sub-volume containing the filament was extracted from a tomogram, which was then 2D projected. The projected image was used for real space helical reconstruction to create the map. Resolution was estimated compared to molmap generation of PDB:3J0S at 20 angstroms in Chimera and correlation score of 0.93 was obtained. 使用した粒子像数: 1