Emerging opportunities in structural biology with X-ray free-electron lasers.

Emerging opportunities in structural biology with X-ray free-electron lasers.
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DOI:
10.1016/j.sbi.2012.07.015
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发表时间:
2012-10
影响因子:
6.8
通讯作者:
Miao J
Miao J
中科院分区:
生物学2区
文献类型:
--
作者:
Schlichting I;Miao J

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X射线自由电子激光器(X-FEL)产生的X射线脉冲具有非常明亮的峰值强度和超短脉冲持续时间。有人提出,辐射损伤可以“跑”,通过使用一个超强的和短的X-FEL脉冲,通过生物样品之前发生的重大辐射损伤。“破坏前衍射”的概念最近在直线加速器相干光源上得到了证明,直线加速器相干光源是第一个可操作的硬X射线自由电子激光,用于蛋白质纳米晶体和巨型病毒颗粒。单粒子的连续衍射图案允许通过具有迭代算法的过采样方法来解决经典的“相位问题”。如果从一个(生物)粒子的许多相同副本中收集到足够的数据,就可以重建它的三维结构。本文综述了X自由电子激光用于连续飞秒晶体学(SFX)和单粒子相干衍射成像(CDI)的研究现状和前景。
X-ray free-electron lasers (X-FELs) produce X-ray pulses with extremely brilliant peak intensity and ultrashort pulse duration. It has been proposed that radiation damage can be “outrun” by using an ultra intense and short X-FEL pulse that passes a biological sample before the onset of significant radiation damage. The concept of “diffraction-before-destruction” has been demonstrated recently at the Linac Coherent Light Source, the first operational hard X-ray FEL, for protein nanocrystals and giant virus particles. The continuous diffraction patterns from single particles allow solving the classical “phase problem” by the oversampling method with iterative algorithms. If enough data are collected from many identical copies of a (biological) particle, its three-dimensional structure can be reconstructed. We review the current status and future prospects of serial femtosecond crystallography (SFX) and single-particle coherent diffraction imaging (CDI) with X-FELs.
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