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POT, an optogenetics-based endogenous protein degradation system.

Yunyue Chen1, Siyifei Wang1, Luhao Zhang1,2

  • 1Department of Biomedical Engineering, MOE Key Laboratory of Biomedical Engineering, State Key Laboratory of Extreme Photonics and Instrumentation, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, Zhejiang, China.

Communications Biology
|March 19, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed Peptide-mediated OptoTrim-Away (POT), a novel optogenetic system using peptides to rapidly degrade specific endogenous proteins with light. This technology offers a new way to control protein levels for cell biology and potential therapies.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biotechnology

Background:

  • Precise control of protein levels is vital for cellular health and preventing disease.
  • Optogenetics offers tools for rapid, reversible control of cellular processes.
  • Existing methods for protein manipulation can be limited in scope and speed.

Purpose of the Study:

  • To develop a novel optogenetics-based system for rapid and targeted degradation of endogenous proteins.
  • To engineer a system capable of controlling protein dynamics at various scales using light.
  • To validate the system's efficacy in degrading specific target proteins and influencing cellular functions.

Main Methods:

  • Development of the Peptide-mediated OptoTrim-Away (POT) system utilizing expressed small peptides.
  • Engineering light-induced oligomerization of the E3 ligase TRIM21 to trigger proteasomal degradation.
  • Creation of POT modules (POT-PI3K, POT-GPX4) targeting specific endogenous proteins (PI3K, GPX4) using engineered domains (iSH2, FUNDC1).
  • Validation through live-cell imaging and biochemical experiments.

Main Results:

  • The POT system effectively degraded endogenous PI3K and GPX4 proteins in response to light.
  • POT modules demonstrated potent light-induced downregulation of cancer cell migration and proliferation.
  • The system successfully promoted cancer cell apoptosis.
  • Live-cell imaging and biochemical assays confirmed the system's efficacy.

Conclusions:

  • The POT system provides a practical and rapid method for manipulating endogenous protein levels using optogenetics.
  • This technology can be applied to dissect complex cellular signaling pathways.
  • POT holds potential for developing targeted cellular therapies.