Fluorescence correlation spectroscopy and its potential for intracellular applications

Cell Biochemistry and Biophysics
Petra Schwille

Abstract

Fluorescence correlation spectroscopy (FCS) is a time-averaging fluctuation analysis of small molecular ensembles, combining maximum sensitivity with high statistical confidence. Among a multitude of physical parameters that are, in principle, accessible by FCS, it most conveniently allows to determine local concentrations, mobility coefficients, and characteristic rate constants of fast-reversible and slow-irreversible reactions of fluorescently labeled biomolecules at very low (nanomolar) concentrations, under equilibrium conditions and without physical separation. Its presently most popular instrumentation by confocal-microscope setups allows for a spatial resolution of fractions of femtoliters for the measurement volumes, containing sparse or even single molecules at any time, and encourages the adaptation of the solution-based technique for cellular applications. The scope of this review is thus, to introduce the FCS technique in particular to the reader with biological background, searching for new methods for a precise quantification of physical parameters governing cellular mechanisms and dynamics, especially if high sensitivity and fast dynamic resolution are required. After a short theoretical introduction, examples a...Continue Reading

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