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CAS OpenIR  > 中科院上海应用物理研究所2011-2017年  > 期刊论文
题名:
Automatic crystal centring procedure at the SSRF macromolecular crystallography beamline
作者: Wang, ZJ; Pan, QY; Yang, LF; Zhou, H; Xu, CY; Yu, F; Wang, QS; Huang, S; He, JH
刊名: JOURNAL OF SYNCHROTRON RADIATION
出版日期: 2016
卷号: 23, 页码:1323-1332
关键词: crystal centre ; algorithm ; recognition ; crystallography ; loop centre
DOI: 10.1107/S160057751601451X
通讯作者: He, JH (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China.
文章类型: 期刊论文
英文摘要: X-ray diffraction is a common technique for determining crystal structures. The average time needed for the solution of a protein structure has been drastically reduced by a number of recent experimental and theoretical developments. Since high-throughput protein crystallography benefits from full automation of all steps that are carried out on a synchrotron beamline, an automatic crystal centring procedure is important for crystallographic beamlines. Fully automatic crystal alignment involves the application of optical methods to identify the crystal and move it onto the rotation axis and into the X-ray beam. Crystal recognition has complex dependencies on the illumination, crystal size and viewing angles due to effects such as local shading, inter-reflections and the presence of antifreezing elements. Here, a rapid procedure for crystal centring with multiple cameras using region segment thresholding is reported. Firstly, a simple illumination-invariant loop recognition and classification model is used by slicing a low-magnification loop image into small region segments, then classifying the loop into different types and aligning it to the beam position using feature vectors of the region segments. Secondly, an edge detection algorithm is used to find the crystal sample in a high-magnification image using region segment thresholding. Results show that this crystal centring method is extremely successful under fluctuating light states as well as for poorly frozen and opaque samples. Moreover, this crystal centring procedure is successfully integrated into the enhanced Blu-Ice data collection system at beamline BL17U1 at the Shanghai Synchrotron Radiation Facility as a routine method for an automatic crystal screening procedure.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000386928700006
ISSN号: 1600-5775
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26436
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Wang, ZJ,Pan, QY,Yang, LF,et al. Automatic crystal centring procedure at the SSRF macromolecular crystallography beamline[J]. JOURNAL OF SYNCHROTRON RADIATION,2016-01-01,23:1323-1332.
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文件名: Automatic crystal centring procedure at the SSRF macromolecular crystallography beamline.pdf
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