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Related Concept Videos

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
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How to Quantify the Fraction of Photoactivated Fluorescent Proteins in Bulk and in Live Cells
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Protein Level Quantification Across Fluorescence-based Platforms.

Hector Romero1, Annika Schmidt1, Cristina M Cardoso1

  • 1Department of Biology, Technical University of Darmstadt, Darmstadt, Germany.

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|October 11, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a new method to quantify protein concentration in single cells using fluorescence intensity. This technique allows for accurate protein measurement and comparison across different cellular conditions.

Keywords:
FACSFluorescenceMicroscopyQuantificationSingle-cell protein levelsWestern blotting

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Biological processes are sensitive to protein concentration, with inherent cellular variability.
  • Accurate protein quantification is crucial for understanding cell physiology and pathology.
  • Existing methods like Western blot (average population) or fluorescence intensity (relative) have limitations.

Purpose of the Study:

  • To develop a method for precise quantification of protein concentration in single cells.
  • To establish a calibration curve relating fluorescence intensity to absolute protein amounts.
  • To enable comparison of protein levels across cells and conditions.

Main Methods:

  • Purification and concentration determination of the target protein.
  • Fluorescence-activated cell sorting (FACS) of cells tagged with the protein of interest.
  • Calibration using purified protein to correlate fluorescence intensity with protein amount.
  • Development of a calibration curve for universal application.

Main Results:

  • A novel method combining protein purification, FACS, and intensity measurement was established.
  • A calibration curve was generated, enabling direct relation of fluorescence intensity to protein concentration.
  • The method allows for the determination of subcellular protein concentration.

Conclusions:

  • This technique provides a robust way to evaluate and compare protein concentrations in individual cells.
  • Once calibrated, it allows protein quantification using any fluorescence-based instrument.
  • The method overcomes limitations of previous techniques for single-cell protein analysis.