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| タイトル | Evaluating the Volta phase plate for improved tomogram alignment in cryo-electron tomography. |
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| ジャーナル・号・ページ | IUCrJ, Year 2026 |
| 掲載日 | 2026年5月1日 |
著者 | Joshua Hutchings / Daniel Ji / Shawn Zheng / Elizabeth A Montabana / Utz H Ermel / Ariana Peck / Jonathan Schwartz / Rahel Woldeyes / Mohammadreza Paraan / Mallak Ali / Norbert S Hill / Hannah Siems / Daniel Serwas / Anchi Cheng / Dari Kimanius / David A Agard / Clinton S Potter / Bridget Carragher / Yue Yu / ![]() |
| PubMed 要旨 | The Volta phase plate (VPP) can enhance low-frequency phase contrast in cryo-electron microscopy (cryo-EM) and cryo-electron tomography (cryo-ET), but its impact on tomogram alignment has not been ...The Volta phase plate (VPP) can enhance low-frequency phase contrast in cryo-electron microscopy (cryo-EM) and cryo-electron tomography (cryo-ET), but its impact on tomogram alignment has not been systematically assessed. Using sub-2 Å single-particle analysis (SPA) and analytical contrast transfer function (CTF) modeling, we show that despite high-frequency information loss and moderate signal damping, the VPP enhances signal in low-frequency bands that are crucial for tilt-series alignment. We show that VPP tomograms exhibit increased contrast and remain higher in contrast post denoising, for thick and crowded specimens. Quantitative comparison of tomograms acquired with and without the VPP shows improved tilt-axis orientation measurements and a higher fraction of tomograms amenable to local tilt-series alignment. Although acquisition with the VPP yields lower subtomogram averaging (STA) resolution, these results show that the primary benefits of the VPP for cryo-ET are contrast enhancement and improved tilt-series alignment robustness, which are crucial for studying cellular ultrastructure and protein organization in crowded environments, where STA at moderate resolutions remains valuable. |
リンク | IUCrJ / PubMed:41954506 |
| 手法 | EM (単粒子) / EM (サブトモグラム平均) |
| 解像度 | 1.66 - 7.0 Å |
| 構造データ | ![]() EMDB-75263: Apoferritin single-particle cryo-EM reconstruction using a Volta phase plate ![]() EMDB-75265: Apoferritin single-particle cryo-EM reconstruction under matched conditions without a phase plate ![]() EMDB-75890: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of PP7 virus-like-particle with VPP (partial dataset) ![]() EMDB-75895: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 80S ribosome without VPP (full dataset) ![]() EMDB-75896: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 80S ribosome without VPP (partial dataset) ![]() EMDB-75897: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 80S ribosome with VPP (full dataset) ![]() EMDB-75898: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 70S ribosome without VPP (full dataset) ![]() EMDB-75899: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 70S ribosome without VPP (partial dataset) ![]() EMDB-75900: Evaluating the Volta Phase Plate for Improved Tomogram Alignment in Cryo-Electron Tomography: structure of 70S ribosome with VPP (full dataset) |
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Homo sapiens (ヒト)
Mycoplasma mycoides (牛肺疫菌)