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蛋白质标签的光强度取决于它们的亚细胞位置

Yan Chen¹, John P Eichorst¹, Barbara Barylko²

¹School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.

|February 26, 2026

概括

光蛋白 (FP) 标记可以改变明显的蛋白质定位,原因是依赖pH的光. 不同的FP标签,如EGFP和mCherry,在有机细胞表面显示出令人惊的分布差异,表明微环境敏感性.

科学领域:

细胞生物学细胞生物学
生物化学生物化学
分子成像学分子成像学

背景情况:

光蛋白 (FP) 标记对于可视化细胞中的蛋白质定位至关重要.
由于染色体质子,FP光强度取决于pH值,影响了定量分析.
一个FP的pKa在不同的细胞pH水平下影响其亮度.

研究的目的:

研究不同FP标签如何影响蛋白质在有机细胞表面感知到的亚细胞分布.
确定FP pKa是否影响细胞质中明显的蛋白质定位.
评估FP微环境敏感性对成像研究的影响.

主要方法:

使用EGFP和mCherry光蛋白来标记细胞蛋白质.
检查的蛋白质定位在分泌/内细胞器官的细胞质表面.
使用Pearson的相关系数对不同的FP标签组合进行量化信号重叠.

主要成果:

在比较EGFP和mCherry标记蛋白时,观察到明显蛋白质分布的显著差异 (PCC ~0.80).
当将mCherry与像mTurquoise或mCerulean (PCC ~0.90-0.95) 等低pKaFP进行比较时,差异很小.
这些差异表明FP标签对有机体表面微环境敏感,而不仅仅是批量细胞质pH.

结论:

FP标签可以在器官表面表现出差异性行为,影响感知到的蛋白质定位.
选择FP标签至关重要,可以在亚细胞分布研究中引入人工物.
在有机体周围的微环境因素可能会影响FP特征,而不仅仅是简单的pH影响.

关键词:

欧洲粮食计划署 (EGFP) 是一个全球粮食计划署.不同的光强度的差异.光蛋白 (FP) 是一种光蛋白质.mCherry 桃是一种通过分泌/内细胞通路.

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