Cell-Compatible Nanoprobes for Imaging Intracellular Phosphatase Activities

Area of Science:

• Biochemistry
• Cell Biology
• Molecular Imaging

Background:

• Phosphatases are crucial enzymes in cellular processes.
• Existing probes for phosphatase activity lack selectivity and cell compatibility.
• Current methods often require cell fixation or cause cytotoxicity.

Purpose of the Study:

• To develop novel, cell-compatible molecular probes for live-cell imaging of phosphatase activity.
• To investigate the role of ectophosphatase inhibition in achieving selective intracellular phosphatase imaging.
• To establish a general strategy for designing enzyme activity probes in complex biological systems.

Main Methods:

• Conjugation of a d-peptide to a quinazolinone derivative to create novel probes.
• Assessment of probe compatibility and biostability in live cells.
• Evaluation of ectophosphatase inhibition for enhancing intracellular probe function.

Main Results:

• The developed d-peptide-quinazolinone probes are cell-compatible and biostable.
• Inhibiting ectophosphatases is essential for selective imaging of intracellular phosphatases.
• This study presents the first use of selective inhibitors to ensure the intracellular function of molecular probes.

Conclusions:

• Novel d-peptide-conjugated quinazolinone probes allow for live-cell imaging of phosphatase activity.
• Selective inhibition of ectophosphatases is a critical step for intracellular enzyme profiling.
• This work provides a versatile platform for designing targeted molecular probes for enzyme activity in complex cellular environments.