Synthesis and Applications of Porphyrin-Biomacromolecule Conjugates.

Area of Science:

• Bioconjugation Chemistry
• Materials Science
• Biomedical Engineering

Background:

• Porphyrinoids are crucial for light-responsive applications, particularly in targeted cancer therapy.
• Covalent conjugation of porphyrinoids to biomacromolecules is essential for developing advanced materials and biomedical tools.
• Diverse biomacromolecules (oligonucleotides, peptides, proteins, antibodies) require tailored conjugation strategies due to their unique structures and properties.

Purpose of the Study:

• To review key synthetic approaches for conjugating porphyrinoids with oligonucleotides and peptides/proteins.
• To discuss the applications of these porphyrinoid-biomacromolecule conjugates.
• To provide an overview of porphyrin-antibody conjugates and future directions in the field.

Main Methods:

• Review of synthetic strategies for porphyrinoid conjugation, including bioorthogonal chemistry (e.g., phosphoramidites, click chemistry, Staudinger ligation, alkyne-azide cycloadditions).
• Discussion of conjugation approaches utilizing native functional groups (thiols, amines) and de novo introduced functional groups.
• Analysis of methods for tethering porphyrins to oligonucleotides via solid-phase synthesis or post-synthesis modifications.
• Examination of conjugation techniques for peptides and proteins, emphasizing site-specific strategies.

Main Results:

• Oligonucleotide-porphyrin conjugates are explored for nanostructure self-assembly and artificial light-harvesting, with emerging clinical applications in antimicrobial biomaterials and nucleic acid cleavage.
• Porphyrin-peptide/protein conjugates are predominantly used in therapeutic and diagnostic applications, including photodynamic therapy (PDT), photodynamic antimicrobial chemotherapy (PACT), and photothermal therapy (PTT).
• Porphyrin-antibody conjugates represent a rapidly advancing area with significant therapeutic potential.

Conclusions:

• Tailored synthetic approaches are critical for effective porphyrinoid conjugation to diverse biomacromolecules.
• Porphyrinoid-bioconjugation chemistry is advancing from basic research towards clinically relevant applications.
• Continued innovation in synthetic strategies will drive future developments in porphyrinoid-biomacromolecule conjugates for materials and medicine.