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A Superfolder Green Fluorescent Protein-Based Biosensor Allows Monitoring of Chloride in the Endoplasmic Reticulum.

Kaavian Shariati1, Yaohuan Zhang1,2, Simone Giubbolini3

  • 1Diabetes Center, University of California San Francisco, San Francisco, California 94143, United States.

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Summary

Researchers developed a novel fluorescent biosensor to measure chloride concentration within the endoplasmic reticulum (ER). This new tool reveals significantly lower ER chloride levels compared to the cytosol, advancing cellular research.

Keywords:
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Chloride concentration is a critical cellular parameter, measurable in the cytoplasm and secretory granules.
  • Existing biosensors lack sufficient fluorescence for accurate measurements within the endoplasmic reticulum (ER) lumen.
  • The ER lumen presents unique challenges for biosensor performance due to its environment.

Purpose of the Study:

  • To develop a novel fluorescent biosensor capable of measuring chloride concentration within the ER lumen.
  • To enable simultaneous measurement of both chloride and pH in challenging cellular compartments.
  • To investigate the intracellular distribution of chloride, specifically comparing ER and cytosolic levels.

Main Methods:

  • Engineered a fluorescent biosensor by combining a chloride-sensitive superfolder green fluorescent protein (GFP) with a long Stokes-shifted mKate2.
  • Validated the biosensor's functionality and fluorescence retention within the ER lumen of live cells.
  • Utilized the developed biosensor for dynamic measurements of chloride concentration in the ER.

Main Results:

  • The novel biosensor successfully retained fluorescence and function within the ER lumen.
  • Demonstrated that chloride concentration in the ER is significantly lower than in the cytosol.
  • The biosensor facilitates dynamic monitoring of ER chloride levels.

Conclusions:

  • A new fluorescent biosensor allows for unprecedented dynamic measurement of chloride in the ER.
  • ER chloride concentration is lower than previously assumed, with implications for cellular function.
  • This biosensor technology may be applicable to other challenging protein-folding environments.