ジャーナル: J Struct Biol / 年: 2021 タイトル: VHUT-cryo-FIB, a method to fabricate frozen hydrated lamellae from tissue specimens for in situ cryo-electron tomography. 著者: Jianguo Zhang / Danyang Zhang / Lei Sun / Gang Ji / Xiaojun Huang / Tongxin Niu / Jiashu Xu / Chengying Ma / Yun Zhu / Ning Gao / Wei Xu / Fei Sun / 要旨: Cryo-electron tomography (cryo-ET) provides a promising approach to study intact structures of macromolecules in situ, but the efficient preparation of high-quality cryosections represents a ...Cryo-electron tomography (cryo-ET) provides a promising approach to study intact structures of macromolecules in situ, but the efficient preparation of high-quality cryosections represents a bottleneck. Although cryo-focused ion beam (cryo-FIB) milling has emerged for large and flat cryo-lamella preparation, its application to tissue specimens remains challenging. Here, we report an integrated workflow, VHUT-cryo-FIB, for efficiently preparing frozen hydrated tissue lamella that can be readily used in subsequent cryo-ET studies. The workflow includes vibratome slicing, high-pressure freezing, ultramicrotome cryo-trimming and cryo-FIB milling. Two strategies were developed for loading cryo-lamella via a side-entry cryo-holder or an FEI AutoGrid. The workflow was validated by using various tissue specimens, including rat skeletal muscle, rat liver and spinach leaf specimens, and in situ structures of ribosomes were obtained at nanometer resolution from the spinach and liver samples.
名称: Spinach 80S ribosome / タイプ: complex / ID: 1 / 親要素: 0 詳細: Ribosomes were found in cryo-lamella of spinach leaf tissue.
由来(天然)
生物種: Spinacia olerac (ホウレンソウ)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
サブトモグラム平均法
試料の集合状態
particle
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試料調製
緩衝液
pH: 7
凍結
凍結剤: NITROGEN
詳細
A puncher was used to cut a slice at about 2 mm diameter from the leaf of spinach. The leaf was then put in the recess of the carrier and frozen by HPF. A lamella was milled from the frozen sample through FIB. Tilt series data was collected on the lamella.