Iterative stable alignment and clustering of 2D transmission electron microscope images.
Iterative stable alignment and clustering of 2D transmission electron microscope images.
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DOI:
10.1016/j.str.2011.12.007
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发表时间:
2012-02-08
期刊:
影响因子:
--
通讯作者:
Penczek PA
中科院分区:
文献类型:
--
作者:
Yang Z;Fang J;Chittuluru J;Asturias FJ;Penczek PA
Identification of homogeneous subsets of images in a macromolecular electron microscopy (EM) image data set is a critical step in single-particle analysis. The task is handled by iterative algorithms, whose performance is compromised by the compounded limitations of image alignment and K-means clustering. Here we describe an approach, iterative stable alignment and clustering (ISAC) that, relying on a new clustering method and on the concepts of stability and reproducibility, can extract validated, homogeneous subsets of images. ISAC requires only a small number of simple parameters and, with minimal human intervention, can eliminate bias from two-dimensional image clustering and maximize the quality of group averages that can be used for ab initio three-dimensional structural determination and analysis of macromolecular conformational variability. Repeated testing of the stability and reproducibility of a solution within ISAC eliminates heterogeneous or incorrect classes and introduces critical validation to the process of EM image clustering.
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