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Spatiotemporal-Controlled Reporter for Cell-Surface Proteolytic Enzyme Activity Visualization.

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  • 1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

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|October 11, 2018
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Summary
This summary is machine-generated.

Researchers developed a light-activated peptide probe to visualize cell-surface furin protease activity in real-time. This tool overcomes challenges in studying enzymes within the complex cell membrane environment.

Keywords:
FRETbiosensorsenzymesimaging agentspeptides

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biotechnology

Background:

  • Live-cell imaging of cell-surface proteases is vital for understanding physiological and pathological processes.
  • The cell membrane's complexity hinders specific investigation of proteolytic activities.
  • Furin, a cell-surface protease, plays critical roles in biological functions.

Purpose of the Study:

  • To design and synthesize a novel peptide probe for visualizing cell-surface furin activity in live cells.
  • To achieve spatiotemporal control over protease activity detection using UV-light illumination.
  • To overcome limitations in studying membrane-associated enzyme functions.

Main Methods:

  • Development of a photoremovable, furin-responsive peptide probe.
  • Incorporation of a photolabile moiety (4,5-dimethoxy-2-nitrobenzyl) to control probe activation.
  • Utilizing UV-light illumination to trigger probe uncaging and subsequent enzymatic hydrolysis.
  • Real-time fluorescence imaging to monitor furin-like enzyme activity.

Main Results:

  • The synthesized probe remained inactive (no fluorescence) prior to UV-light exposure due to the photolabile group.
  • UV-light irradiation induced photolysis, uncaging the peptide probe.
  • The uncaged probe was hydrolyzed by furin-like enzymes, resulting in a detectable increase in fluorescence signal.
  • Successful real-time imaging of endogenous cell-surface furin activity with spatial and temporal resolution was achieved.

Conclusions:

  • The novel photoremovable peptide probe enables precise, light-controlled visualization of cell-surface furin activity in live cells.
  • This approach offers a significant advancement for studying the biological roles of membrane-associated proteases.
  • The developed tool provides a new method for real-time monitoring of enzyme function in complex cellular microenvironments.