Intensity statistics in twinned crystals with examples from the PDB

被引:66
作者
Lebedev, AA [1 ]
Vagin, AA [1 ]
Murshudov, GN [1 ]
机构
[1] Univ York, Dept Chem, Struct Biol Lab, York YO10 5YW, N Yorkshire, England
来源
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY | 2006年 / 62卷
基金
英国惠康基金;
关键词
D O I
10.1107/S0907444905036759
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Entries deposited in the Protein Data Bank as of February 2004 for which both model and X-ray data were available were analysed to identify cases of twinning using such simple statistics as the R factor between potential twin-related reflections. Careful consideration of all identified twins showed that in many cases twinning was ignored during structure solution and refinement. Manual analysis of the models showed that twinning often occurs in association with rotational pseudosymmetry parallel to the twinning operator. The coexistence of these two phenomena complicates the detection and diagnostics of twinning using currently available twinning tests. It was concluded that a twinning-detection step should be incorporated in every stage of structure analysis from data acquisition to refinement and validation.
引用
收藏
页码:83 / 95
页数:13
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