Protein crystal diffraction patterns using a capillary-focused synchrotron X-ray beam

被引:26
作者
Balaic, DX
Barnea, Z
Nugent, KA
Garrett, RF
Varghese, JN
Wilkins, SW
机构
[1] AUSTRALIAN NUCL SCI & TECHNOL ORG,MENAI,NSW 2234,AUSTRALIA
[2] BIOMOL RES INST,PARKVILLE,VIC 3052,AUSTRALIA
[3] CSIRO,DIV MAT SCI & TECHNOL,CLAYTON,VIC 3169,AUSTRALIA
关键词
protein crystallography; tapered capillary optics; X-ray focusing; X-ray optics;
D O I
10.1107/S0909049596009351
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A paraboloidally tapered glass monocapillary was used to focus an 8 keV monochromatized synchrotron bending-magnet X-ray beam into a 40(+/-5) mu m focal spot located 45 (+/-5) mm from the exit of the capillary. This focal spot had a measured intensity gain of 120(+/-10) times the intensity present in an equivalent cross section of the unfocused beam from the monochromator. This focused beam was used to obtain oscillation diffraction patterns on image plates from a hen egg-white lysozyme protein crystal in two distinct geometries: one with the specimen crystal at the capillary exit and the other with the crystal at the beam focus. In the first geometry, focused Bragg reflections were observed at the focal plane. In the second geometry, diverging Bragg reflections of high intensity from a small crystal volume were observed. Image-plate diffraction patterns for these two geometries were compared with exposures with equivalent integrated diffracted intensities obtained using a 100 x 100 mu m unfocused X-ray beam with the same crystal. The use of the focused beam resulted in a reduction in the exposure time required to produce equivalent patterns by a factor of between 70 and 100.
引用
收藏
页码:289 / 295
页数:7
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