Selective detection of protein crystals by second harmonic microscopy.

Selective detection of protein crystals by second harmonic microscopy.
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DOI:
10.1021/ja805983b
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发表时间:
2008-10-29
影响因子:
15
通讯作者:
Simpson GJ
Simpson GJ
中科院分区:
化学1区
文献类型:
--
作者:
Wampler RD;Kissick DJ;Dehen CJ;Gualtieri EJ;Grey JL;Wang HF;Thompson DH;Cheng JX;Simpson GJ

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二次谐波发生(SHG)显微镜的独特的对称性,使敏感和选择性的蛋白质微晶与溶剂化的蛋白质或无定形蛋白质聚集体的贡献可以忽略不计的成像。在研究的微晶绿色荧光蛋白(GFP)在500 μ L液滴制备,SHG强度媲美荧光,但具有极好的选择性结晶区。无定形聚集体和溶液中的GFP产生大量的背景荧光,但没有检测到SHG。检测到的前向与后向SHG的比率提供了粒度的量度,表明在低放大倍数(10倍)下检测限低至直径<100 nm的微晶。除了灵敏度和高选择性外,手性晶体的二阶非线性光学成像(SONICC)几乎与所有常见的蛋白质结晶平台直接兼容。
The unique symmetry properties of second harmonic generation (SHG) microscopy enabled sensitive and selective imaging of protein microcrystals with negligible contributions from solvated proteins or amorphous protein aggregates. In studies of microcrystallites of green fluorescent protein (GFP) prepared in 500 pL droplets, the SHG intensities rivaled those of fluorescence, but with superb selectivity for crystalline regions. GFP in amorphous aggregates and in solution produced substantial background fluorescence, but no detectable SHG. The ratio of the forward-to-backward detected SHG provides a measure of the particle size, suggesting detection limits down to crystallites ∼100 nm in diameter under low magnification (10×). In addition to being sensitive and highly selective, second-order nonlinear optical imaging of chiral crystals (SONICC) is directly compatibility with virtually all common protein crystallization platforms.
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