Strategies for picking membrane-associated particles within subtomogram averaging workflows.

Strategies for picking membrane-associated particles within subtomogram averaging workflows.
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DOI:
10.1039/d2fd00022a
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发表时间:
2022-11-08
影响因子:
3.4
通讯作者:
Zanetti, Giulia
Zanetti, Giulia
中科院分区:
化学2区
文献类型:
--
作者:
Pyle, Euan;Hutchings, Joshua;Zanetti, Giulia

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具有亚断层图像平均(STA)的冷冻电子断层扫描(cryo-ET)已经成为体外和原位确定大分子结构的关键工具。然而,用STA处理冷冻ET数据目前需要大量的用户专业知识。最近的努力已经简化了STA工作流程中的几个步骤;然而,颗粒拾取仍然是许多项目的耗时瓶颈,需要大量的用户输入。在这里,我们提出了几种策略的时间效率和准确挑选的膜相关颗粒使用COPII内涂层作为案例研究。我们还讨论了一系列颗粒清洗解决方案,以从STA数据集中去除质量差和假阳性颗粒。我们为用户提供了一个分步指南和必要的脚本,以独立执行所讨论的颗粒拾取和清洁策略。在低温断层扫描和亚断层图像平均中,颗粒拾取构成了主要瓶颈,并且需要大量的用户时间和专业知识。在这里,我们总结了颗粒拾取策略,特别是专注于膜相关的颗粒。
Cryo-electron tomography (cryo-ET) with subtomogram averaging (STA) has emerged as a key tool for determining macromolecular structure(s) in vitro and in situ. However, processing cryo-ET data with STA currently requires significant user expertise. Recent efforts have streamlined several steps in STA workflows; however, particle picking remains a time-consuming bottleneck for many projects and requires considerable user input. Here, we present several strategies for the time-efficient and accurate picking of membrane-associated particles using the COPII inner coat as a case study. We also discuss a range of particle cleaning solutions to remove both poor quality and false-positive particles from STA datasets. We provide a step-by-step guide and the necessary scripts for users to independently carry out the particle picking and cleaning strategies discussed. In cryo-tomography and subtomogram averaging, particle picking constitutes a major bottleneck and requires significant user time and expertise. Here we summarise particle-picking strategies, focusing in particular on membrane-associated particles.
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