Qualitative and quantitative protease activity tests based on protein degradation in three-dimensional structures.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biomarker Discovery

Background:

• Protease activity patterns correlate with physiological states and diseases.
• Changes in protease activity serve as valuable biomarkers for disease monitoring.
• Rapid and simple protease activity determination methods are needed for efficient disease management.

Purpose of the Study:

• To develop and demonstrate two novel methods for qualitative and quantitative protease activity determination.
• To utilize proteinase K as a model system for validating the new detection techniques.
• To explore the potential for enhancing the sensitivity of these protease detection systems.

Main Methods:

• A colorimetric assay using a protein-modified, colored 3D silica structure that changes color upon protease interaction.
• Detection of matrix metallo-protease 2 (MMP2) using gelatin as a substrate on the silica platform.
• A voltammetric assay employing a cytochrome c/DNA multilayer electrode, measuring the decrease in signal after protease incubation.

Main Results:

• The silica-based method detected protease activity down to 0.15 U/ml.
• The voltammetric electrode method achieved detection limits of approximately 0.03 U/ml for proteinase K.
• Both methods demonstrated functionality and potential for further sensitivity improvements.

Conclusions:

• Two distinct and sensitive methods for protease activity detection have been successfully developed and validated.
• These methods offer potential for rapid and efficient monitoring of diseases through protease biomarkers.
• Further research can enhance the sensitivity of these assays for broader diagnostic applications.