光漂白
光漂白后的荧光恢复
绿色荧光蛋白
荧光
生物物理学
嵌合体(遗传学)
化学
荧光显微镜
共焦显微镜
费斯特共振能量转移
细胞生物学
生物化学
生物
光学
基因
物理
作者
Erik L. Snapp,Nihal Altan,Jennifer Lippincott‐Schwartz
标识
DOI:10.1002/0471143030.cb2101s19
摘要
Abstract This unit describes fluorescence recovery after photobleaching (FRAP) and fluorescence loss in photobleaching (FLIP) using commercially available confocal scanning laser microscopy (CSLM). Photobleaching is the photo‐induced change in a fluorphore that abolishes that molecule's fluorescence. The different characteristics of green fluorescent protein (GFP) chimeras in a cell can be studied by FRAP, in which a selected region of the cell is photobleached with intense light. The movement of unbleached molecules into a photobleached region is quantified by imaging with an attenuated light source. The movement of molecules between cellular compartments can be determined by FLIP, in which the same region of a cell expressing a GFP chimera is repeatedly photobleached. The loss of fluorescence from regions outside the photobleached region is monitored to characterize the movement of a protein. Together these two techniques are providing fundamentally new insights into the kinetic properties of proteins in cells.
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