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首页> 外文期刊>Biophysical Journal >Quantitative determination of spatial protein-protein correlations in fluorescence confocal microscopy.
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Quantitative determination of spatial protein-protein correlations in fluorescence confocal microscopy.

机译:在荧光共聚焦显微镜中定量测定空间蛋白之间的相关性。

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摘要

To quantify spatial protein-protein proximity (colocalization) in paired microscopic images of two sets of proteins labeled by distinct fluorophores, we showed that the cross-correlation and the autocorrelation functions of image intensity consisted of fast and slowly decaying components. The fast component resulted from clusters of proteins specifically labeled, and the slow component resulted from image heterogeneity and a broadly-distributed background. To better evaluate spatial proximity between the two specifically labeled proteins, we extracted the fast-decaying component by fitting the sharp peak in correlation functions to a Gaussian function, which was then used to obtain protein-protein proximity index and the Pearson's correlation coefficient. We also employed the median-filter method as a universal approach for background reduction to minimize nonspecific fluorescence. We illustrated our method by analyzing computer-simulated images and biological images.
机译:为了量化由不同荧光团标记的两组蛋白质的配对显微镜图像中的空间蛋白质-蛋白质接近度(共定位),我们显示图像强度的互相关和自相关函数由快速衰减成分和缓慢衰减成分组成。快速成分是由专门标记的蛋白质簇产生的,而慢成分是由图像异质性和广泛分布的背景引起的。为了更好地评估两个特殊标记的蛋白质之间的空间接近性,我们通过将相关函数中的尖峰拟合为高斯函数来提取快速衰减成分,然后将其用于获得蛋白质-蛋白质接近指数和皮尔逊相关系数。我们还采用中值滤波方法作为减少背景的通用方法,以最大程度地减少非特异性荧光。我们通过分析计算机模拟图像和生物图像说明了我们的方法。

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