Water-Soluble Star Polymer as a Potential Photoactivated Nanotool for Lysozyme Degradation

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Photochemistry

Background:

• Artificial peptidases are crucial for chemical sensing and macromolecular modification in biomedicine.
• Metal porphyrins offer potential due to their complexation with amino acids and light-induced reactive oxygen species (ROS) generation.
• PEGylation addresses porphyrins' hydrophobicity and aggregation issues in aqueous environments.

Purpose of the Study:

• To design and evaluate a PEGylated mercury porphyrin as an artificial photo-protease agent.
• To demonstrate its capability for detecting and degrading specific biomolecules like l-Tryptophan and lysozyme.
• To explore its potential in theranostics and targeted therapies.

Main Methods:

• Synthesis of a PEGylated mercury porphyrin (Star3600_Hg).
• Complexation studies with l-Tryptophan.
• Photodegradation assays using green (532 nm) and red (650 nm) lasers to generate ROS.
• Characterization using UV-Vis, fluorescence, circular dichroism, and MALDI-TOF mass spectrometry.

Main Results:

• The PEGylated mercury porphyrin formed a stable complex with l-Tryptophan.
• The system effectively detected and degraded l-Trp and lysozyme via light-induced ROS.
• Spectroscopic and mass spectrometry analyses confirmed lysozyme cleavage into smaller peptide fragments.

Conclusions:

• The developed artificial photo-protease agent shows promise for targeted biomolecule degradation.
• This approach offers potential for advanced theranostic and therapeutic applications in medicine.
• PEGylated metal porphyrins represent a viable strategy for creating functional nanotools in biomedicine.