Copper-tripeptides (cuzymes) with peroxidase-mimetic activity

Area of Science:

• Biochemistry
• Enzymology
• Materials Science

Background:

• Peroxidases are enzymes catalyzing hydrogen peroxide-mediated oxidations.
• Copper-tripeptide complexes (cuzymes) are investigated for novel enzymatic activities.

Purpose of the Study:

• To explore the peroxidase-like activity of copper-tripeptide complexes.
• To assess the influence of tripeptide sequence on cuzyme activity.
• To evaluate cuzymes for dye degradation applications.

Main Methods:

• Synthesis of various copper-tripeptide complexes (Cu-GGG, Cu-HGG, Cu-GGH).
• Assay of peroxidase-like activity using 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) as a substrate.
• Kinetic analysis of trypan blue dye degradation by cuzymes and hydrogen peroxide.

Main Results:

• Cu-GGG exhibited the highest peroxidase-like activity, exceeding horseradish peroxidase (HRP) by 2.5-fold.
• The activity order was Cu-GGG > Cu-HGG > Cu-GGH.
• Cu-GGG effectively degraded trypan blue dye within 15 minutes under specific conditions.
• Degradation kinetics were second-order, dependent on H2O2 and cuzyme concentration.

Conclusions:

• Copper-tripeptide complexes possess significant peroxidase-like catalytic properties.
• Tripeptide sequence critically influences cuzyme activity.
• Cuzy mes show promise for applications in biochemical assays and environmental remediation due to their catalytic efficiency.