炔烃标记的拉曼探针已显示出对小生物分子进行无创和灵敏可视化以了解它们在活细胞中的功能作用的巨大希望。然而,炔烃感知超越成像的细胞环境的潜力仍有待进一步探索。在这里,我们报告了一种通过末端炔烃(称为炔烃-HDX)的氢-氘交换(HDX)进行基于拉曼成像的局部环境传感的一般策略。我们首先在多个拉曼探针中证明,炔基氢的氘化会导致炔烃拉曼峰发生显着位移约 130 cm –1,提供适合基于成像的高特异性分析的可分辨信号。我们的分析推导和实验表征随后都确定 HDX 动力学与炔烃 p Ka s 和环境 pD呈线性比例。在验证了该策略的定量性质后,我们将炔烃-HDX 应用于感测局部化学和细胞环境。我们确定炔烃-HDX 对各种 DNA 结构表现出高灵敏度,并展示了原位检测 DNA 结构变化的能力免受紫外线引起的伤害。我们进一步表明,这种策略也适用于解决活细胞中细微的 pD 变化。总而言之,我们的工作为利用炔烃-HDX
Practical Labeling Methodology for Choline-Derived Lipids and Applications in Live Cell Fluorescence Imaging
摘要:
AbstractLipids of the plasma membrane participate in a variety of biological processes, and methods to probe their function and cellular location are essential to understanding biochemical mechanisms. Previous reports have established that phosphocholine‐containing lipids can be labeled by alkyne groups through metabolic incorporation. Herein, we have tested alkyne, azide and ketone‐containing derivatives of choline as metabolic labels of choline‐containing lipids in cells. We also show that 17‐octadecynoic acid can be used as a complementary metabolic label for lipid acyl chains. We provide methods for the synthesis of cyanine‐based dyes that are reactive with alkyne, azide and ketone metabolic labels. Using an improved method for fluorophore conjugation to azide or alkyne‐modified lipids by Cu(I)‐catalyzed azide‐alkyne cycloaddition (CuAAC), we apply this methodology in cells. Lipid‐labeled cell membranes were then interrogated using flow cytometry and fluorescence microscopy. Furthermore, we explored the utility of this labeling strategy for use in live cell experiments. We demonstrate measurements of lipid dynamics (lateral mobility) by fluorescence photobleaching recovery (FPR). In addition, we show that adhesion of cells to specific surfaces can be accomplished by chemically linking membrane lipids to a functionalized surface. The strategies described provide robust methods for introducing bioorthogonal labels into native lipids.
[EN] DEVICES, COMPOSITIONS AND METHODS FOR IMAGING WITH RAMAN SCATTERING<br/>[FR] DISPOSITIFS, COMPOSITIONS ET PROCÉDÉS POUR UNE IMAGERIE À DIFFUSION RAMAN
申请人:UNIV COLUMBIA
公开号:WO2014205074A3
公开(公告)日:2016-02-04
METHODS FOR INHIBITING CONVERSION OF CHOLINE TO TRIMETHYLAMINE (TMA)