De novo main-chain modeling for EM maps using MAINMAST.

De novo main-chain modeling for EM maps using MAINMAST.
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DOI:
10.1038/s41467-018-04053-7
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发表时间:
2018-04-24
影响因子:
16.6
通讯作者:
Kihara D
Kihara D
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Terashi G;Kihara D

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越来越多的蛋白质结构是由近原子分辨率的低温电子显微镜(Cryo-EM)确定的。然而,追踪主链并从~4-5 ä的EM图中构建全原子模型仍然不是一件微不足道的事情,仍然是一项耗时的任务。在这里,我们介绍了一种全自动从头结构建模方法,MainMast,它从近原子分辨率的EM图建立蛋白质的三维模型。该方法直接追踪蛋白质的主链,并在EM图谱中将Cα位置识别为树形图结构。在建立全球蛋白质结构模型方面,MainMast的表现明显好于现有软件,数据集包括40个5 ä分辨率的模拟密度图和30个实验确定的2.6-4.8 ä分辨率图。在EM图谱的蛋白质模型中构建缺失片段的另一个基准是,Main Mast构建了长度为11-161个残基的片段,平均RMSD为2.68RMSDä。对于中分辨率低温电磁图来说,主链追踪仍然是一项耗时的任务。在这里,作者描述了MainMast,一种从4-5?分辨率的EM图建立蛋白质主链结构模型的计算方法,它通过跟踪密度分布中的局部密点来建立蛋白质的主链模型。
An increasing number of protein structures are determined by cryo-electron microscopy (cryo-EM) at near atomic resolution. However, tracing the main-chains and building full-atom models from EM maps of ~4–5 Å is still not trivial and remains a time-consuming task. Here, we introduce a fully automated de novo structure modeling method, MAINMAST, which builds three-dimensional models of a protein from a near-atomic resolution EM map. The method directly traces the protein’s main-chain and identifies Cα positions as tree-graph structures in the EM map. MAINMAST performs significantly better than existing software in building global protein structure models on data sets of 40 simulated density maps at 5 Å resolution and 30 experimentally determined maps at 2.6–4.8 Å resolution. In another benchmark of building missing fragments in protein models for EM maps, MAINMAST builds fragments of 11–161 residues long with an average RMSD of 2.68 Å. Main-chain tracing remains a time-consuming task for medium resolution cryo-EM maps. Here the authors describe MAINMAST, a computational approach for building main-chain structure models of proteins from EM maps of 4-5 Å resolution that builds main-chain models of the protein by tracing local dense points in the density distribution.
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