Quantitatively Predictable Control of Cellular Protein Levels through Proteasomal Degradation

Area of Science:

• Molecular Biology
• Biotechnology
• Cell Biology

Background:

• Studying protein function often involves altering protein levels within cells.
• Existing methods typically require genetic manipulation, limiting control and predictability.

Purpose of the Study:

• To develop a technology for rapid, targeted, and predictable post-translational protein depletion without genetic modification.
• To demonstrate proof-of-principle for this technology using a nanobody against green fluorescent protein (GFP).

Main Methods:

• Developed NanoDeg, a bifunctional molecule combining a nanobody with a degron signal for proteasomal degradation.
• Utilized predictive modeling to customize NanoDeg synthesis, degradation rates, and degradation modes.
• Integrated NanoDeg into a genetic circuit with stimulus-dependent GFP output.

Main Results:

• Successfully demonstrated targeted degradation of GFP using the NanoDeg system.
• Showcased quantitative and predictable control over target protein levels by customizing NanoDeg parameters.
• Observed enhanced dynamic range and resolution in a genetic circuit utilizing NanoDeg.

Conclusions:

• The NanoDeg system provides a powerful tool for precise, non-genetic control of cellular protein levels.
• This technology facilitates systems-level analyses of protein function and cellular processes.
• NanoDeg offers a versatile platform for diverse applications in molecular and cell biology research.