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Related Concept Videos

Protein Dynamics in Living Cells01:19

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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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Absolute protein quantification using fluorescence measurements with FPCountR.

Eszter Csibra1, Guy-Bart Stan2

  • 1Department of Bioengineering, Imperial College Centre for Synthetic Biology (IC-CSynB), Imperial College London, London, SW7 2AY, UK. e.csibra@imperial.ac.uk.

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Summary
This summary is machine-generated.

This study introduces FPCountR, a novel method for calibrating fluorescence readings on microplate readers. This approach converts arbitrary units to absolute values, enabling accurate protein quantification in synthetic biology.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Accurate quantification of protein concentration is crucial for biological research and synthetic biology applications.
  • Current fluorescence measurement methods often lack standardization, yielding arbitrary units that hinder inter-study comparisons.
  • The need for robust calibration methods is critical for advancing quantitative biology and synthetic microbial circuit characterization.

Purpose of the Study:

  • To develop a generalizable method, FPCountR, for calibrating fluorescence readings on microplate readers.
  • To convert arbitrary fluorescence units into absolute units for precise protein quantification.
  • To provide open-access tools for the scientific community to adopt this calibration method.

Main Methods:

  • Generation of bespoke fluorescent protein (FP) calibrants.
  • Development of assays to determine protein concentration and activity.
  • Implementation of an analytical workflow including an 'ECmax' assay for accurate calibration.
  • Quantification and correction for fluorescence quenching by cells.
  • Methods for converting optical density to cell counts or volumes.

Main Results:

  • FPCountR enables accurate conversion of arbitrary fluorescence units to absolute units.
  • The 'ECmax' assay provides accurate calibration, even without FP purification.
  • Fluorescence quenching by cells is quantified and corrected for the first time.
  • Calibration is demonstrated to be consistent across different instruments and settings.
  • mCherry absorption does not interfere with cell density measurements under typical conditions.

Conclusions:

  • FPCountR offers a reliable and generalizable method for fluorescence assay calibration.
  • The open-access tools facilitate quantitative characterization of synthetic microbial circuits.
  • This work advances the standardization of fluorescence measurements in biological research.