Objective:

To develop a system that allows real-time monitoring of post-translational modifications (PTMs) inside living cells.

Key Findings:

• The living sensor can monitor enzymatic activity continuously and quantitatively in real-time.
• Inhibiting SIRT1 blocked its molecular activity but did not slow tumor growth, challenging existing assumptions about its role in cancer.
• Acetylation signaling is dynamic and context-dependent, contradicting static models of SIRT1 function.

Interpretation:

The findings suggest that traditional views on the role of SIRT1 in cancer progression may be oversimplified, highlighting the need for more nuanced understanding of enzymatic functions in different biological contexts.

Limitations:

• Technical challenges included ensuring sufficient production of the 21st amino acid and maintaining sensor stability in complex tumor environments.
• Factors such as hypoxia and tissue heterogeneity can influence sensor performance.

Conclusion:

The living sensor technology has potential applications in drug discovery and personalized medicine, allowing for real-time monitoring of various enzymatic activities.