西亚试剂：A Molecular Thermometer Based on Fluorescent Protein Blinki

发布时间：2025-11-06

A Molecular Thermometer Based on Fluorescent Protein Blinking

Felix H. C. Wong, Daniel S. Banks, Asmahan Abu-Arish, and Cécile Fradin*

 

Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4M1, and Department of Biochemistry and Biomedical Science, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada, L8N 3Z5

 

fradin@physics.mcmaster.ca

Received March 6, 2007

Abstract:

With the present trend toward a miniaturization of chemical systems comes the need for a precise characterization of physicochemical parameters in very small fluid volumes. We describe here an original approach for small-scale temperature measurements based on the detection of fluorescent protein blinking. We observed that the characteristic time associated with the reversible protonation reaction responsible for the blinking of the enhanced green fluorescent protein is strongly temperature dependent at low pH. The blinking characteristic time can easily be detected by fluorescence correlation spectroscopy, and therefore provides the means for noninvasive, spatially resolved, absolute temperature measurements. We applied this approach to the quantification of laser-heating effects in thin liquid samples. As expected, we observed a linear dependence between the temperature increase at the laser focus and both the laser power and the sample extinction coefficient. In addition, we were able to measure the laser induced temperature increase at the glass/liquid interface, a value difficult to predict and hard to access experimentally, demonstrating the usefulness of our approach to study surface effects in microfluidic chips. The use of GFP derivatives as genetically encoded molecular thermometers should have direct applications for both microfluidics and single-cell calorimetry.

 

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