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首页> 外文期刊>Acta crystallographica.Section D. Biological crystallography >Multi-crystal anomalous diffraction for low-resolution macromolecular phasing.
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Multi-crystal anomalous diffraction for low-resolution macromolecular phasing.

机译：多晶的反常衍射低分辨率的大分子定相。

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摘要

Multiwavelength anomalous diffraction (MAD) and single-wavelength anomalous diffraction (SAD) are the two most commonly used methods for de novo determination of macromolecular structures. Both methods rely on the accurate extraction of anomalous signals; however, because of factors such as poor intrinsic order, radiation damage, inadequate anomalous scatterers, poor diffraction quality and other noise-causing factors, the anomalous signal from a single crystal is not always good enough for structure solution. In this study, procedures for extracting more accurate anomalous signals by merging data from multiple crystals are devised and tested. SAD phasing tests were made with a relatively large (1456 ordered residues) poorly diffracting (d(min) = 3.5 A) selenomethionyl protein (20 Se). It is quantified that the anomalous signal, success in substructure determination and accuracy of phases and electron-density maps all improve with an increase in the number of crystals used in merging. Structure solutions are possible when no single crystal can support structural analysis. It is proposed that such multi-crystal strategies may be broadly useful when only weak anomalous signals are available.
机译：多波长反常衍射(疯狂)和单波长反常衍射(SAD)新创的两种最常用的方法大分子结构的决心。依赖于准确的提取方法异常信号;比如可怜的内在秩序,辐射损伤,不足异常散射,可怜的衍射质量和其他noise-causing因素,从单晶不是异常信号总是好结构的解决方案。这项研究中,提取程序通过合并数据准确的异常信号多个晶体设计和测试。分阶段测试是用相对较大(1456命令残留物)中(d (min) = 3.5) selenomethionyl蛋白质(20)。量化,异常信号,子结构的决心和成功阶段和电子密度地图的准确性提高数量的增加晶体在合并使用。可能没有一个水晶可以支持结构分析。多晶的策略可能是广泛的有用当只有微弱的异常信号。

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