School of Biomedical Informatics, The University of Texas Health Science Center at Houston, 7000 Fannin St., Houston, TX 77030, USA.
J Struct Biol. 2012 May;178(2):121-8. doi: 10.1016/j.jsb.2012.03.001. Epub 2012 Mar 13.
The molecular graphics program Sculptor and the command-line suite Situs are software packages for the integration of biophysical data across spatial resolution scales. Herein, we provide an overview of recently developed tools relevant to cryo-electron tomography (cryo-ET), with an emphasis on functionality supported by Situs 2.7.1 and Sculptor 2.1.1. We describe a work flow for automatically segmenting filaments in cryo-ET maps including denoising, local normalization, feature detection, and tracing. Tomograms of cellular actin networks exhibit both cross-linked and bundled filament densities. Such filamentous regions in cryo-ET data sets can then be segmented using a stochastic template-based search, VolTrac. The approach combines a genetic algorithm and a bidirectional expansion with a tabu search strategy to localize and characterize filamentous regions. The automated filament segmentation by VolTrac compares well to a manual one performed by expert users, and it allows an efficient and reproducible analysis of large data sets. The software is free, open source, and can be used on Linux, Macintosh or Windows computers.
分子图形程序 Sculptor 和命令行套件 Situs 是用于整合跨空间分辨率尺度的生物物理数据的软件包。本文概述了最近开发的与冷冻电子断层扫描(cryo-ET)相关的工具,重点介绍了 Situs 2.7.1 和 Sculptor 2.1.1 所支持的功能。我们描述了一个自动分割 cryo-ET 图谱中丝状结构的工作流程,包括去噪、局部归一化、特征检测和追踪。细胞肌动蛋白网络的断层扫描图像显示交联和束状丝密度。然后可以使用基于随机模板的搜索工具 VolTrac 对冷冻电子断层扫描数据集的丝状区域进行分割。该方法结合了遗传算法和双向扩展以及禁忌搜索策略,以定位和描述丝状区域。VolTrac 的自动丝分割与专家用户执行的手动分割相比效果良好,并且允许对大型数据集进行高效且可重复的分析。该软件是免费的、开源的,可以在 Linux、Macintosh 或 Windows 计算机上使用。
Biomolecules. 2022-7-23
Methods Enzymol. 2016
Proceedings (IEEE Int Conf Bioinformatics Biomed). 2022-12
Subcell Biochem. 2023
Int J Mol Sci. 2023-12-6
Proceedings (IEEE Int Conf Bioinformatics Biomed). 2021-12
Proceedings (IEEE Int Conf Bioinformatics Biomed). 2021-12
Biomolecules. 2022-7-23
J Struct Biol. 2010-11-13
Biophys Rev. 2010-2
J Struct Biol. 2008-10
Curr Biol. 2007-1-9
Curr Opin Struct Biol. 2004-6