ジャーナル: Structure / 年: 2025 タイトル: Genetically encoded FerriTag as a specific label for cryo-electron tomography. 著者: Chang Wang / Amin Khosrozadeh / Ioan Iacovache / Benoît Zuber / 要旨: Cryo-electron tomography (cryoET) provides 3D datasets of organelles and proteins at nanometer and sub-nanometer resolution. However, locating target proteins in live cells remains a significant ...Cryo-electron tomography (cryoET) provides 3D datasets of organelles and proteins at nanometer and sub-nanometer resolution. However, locating target proteins in live cells remains a significant challenge. Conventional labeling methods, such as fluorescent protein tagging and immunogold labeling, are unsuitable for small structures in vitrified samples at molecular resolution. Directly linking large, visually identifiable proteins to target proteins may alter their structure, localization, and function. To overcome this, we employed a rapamycin-induced oligomer formation system involving two tags, FK506 binding protein (FKBP) and FKBP-rapamycin binding (FRB), which bind in the presence of rapamycin. FKBP is linked to the target protein, while FRB is linked to ferritin, a large (10-12 nm) iron-binding complex that creates strong contrast in cryoET. Upon adding rapamycin to the cell medium, the iron-loaded ferritin accurately marks the target protein location. As in situ cryoET with subtomogram averaging advances, our method addresses the persistent challenge of locating target proteins in live cells.
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 16 / 集束イオンビーム - 電流: 0.11 / 集束イオンビーム - 時間: 600 / 集束イオンビーム - 温度: 100 K / 集束イオンビーム - Initial thickness: 500 / 集束イオンビーム - 最終 厚さ: 150 集束イオンビーム - 詳細: The value given for _em_focused_ion_beam.instrument is FEI. This is not in a list of allowed values {'DB235', 'OTHER'} so OTHER is written into the XML file.
-
電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 平均電子線量: 100.0 e/Å2