Detection of CD40 Protein-Umbelliferone Interaction via Differential Scanning Fluorescence

Our protocol provides a significant advantage by allowing use without specialized equipment. Unlike traditional fluorosis quantitative PCR methods, it simply face the experimental process requiring viewers'data steps and reducing overall complexity, making it simple and easier to conduct. This experiment requires the operator to be very familiar with the experimental procedure and the fluorescent microplate reader, and not to waste too much time during the solution heating and fluorescence detection.

We will focus on the molecular mechanism by which umbelliferone to CD40 protein to produce immune effects. To begin, add 500x orange dye to a PBS solution to achieve different dye ratios. Launch the data acquisition software on the desktop.

Click on instrument, then choose the corresponding microplate model and select OK.Click on the acquisition settings and choose fluorescence. Under the wavelength interface, set the lambda one to 470 nanometers and 570 nanometers. Then press OK.Pipette 100 microliters of each concentration of the orange dye into the wells of a 96 well plate.

Place the plate into the detection stage of the fluorescent microplate reader instrument. Click on the read icon on the software and measure the fluorescence of each dye concentration 13 times at room temperature with an interval of two minutes. After each determination, click on the export icon, then select Export to XML, XLS, TXT.

Choose all plates, then select plate in the output format, and click on OK to save the data in the XLS format for further analysis. Now turn on the digital heating shaking dry bath. Set the heating temperature to 35 degrees Celsius and the heating time to two minutes.

Prepare the optimal dilution ratio of dye in a 1.5 milliliter microcentrifuge tube. Then place it in the digital heating shaking dry bath for two minutes. Now, add 100 microliters of both the PBS and the staining solutions to the wells of the plate.

Place the plate into the detection stage of the instrument. Click on the read icon in the data acquisition software. Set the heating temperature to 40 degrees Celsius and the heating time to two minutes.

Now pipette the dye solution in the plate back into the 1.5 milliliter microcentrifuge tube. Heat it in the digital heating shaking dry bath for two minutes. Repeat the addition of the dye solutions, exporting the resultant data to test the absorbance of the dye solution at five degree temperature increments from 35 to 95 degrees Celsius.

Combine CD40 protein solution with PBS to obtain final concentrations of 5, 10, 15, and 20 micrograms per microliters. Next, combine orange dye with PBS to obtain a final concentration of one is to 500. Assess the absorbance of the CD40 protein solution at five degree temperature increments from 35 to 95 degrees Celsius.

Save the data as XLS files, then calculate the melting point or TM value using the data analysis software. Next, mix CD40 and umbelliferone into the PBS solution. Then pipette the orange dye into the PBS to get a solution concentration of one is to 500.

Measure the absorbance of the CD40 umbelliferone complexes solution at five degree temperature increments from 35 to 95 degrees Celsius. The orange dye consistently exhibited stable fluorescence excitation at both room temperature and elevated temperatures. An optimal dilution ratio of one is to 500 was determined.

A stable TM value of 51.82 degrees Celsius was detectable at a concentration of 15 micrograms per milliliters, which decreased to 45.79 degrees Celsius with an increase in CD40 protein concentration.