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Fluorogenic peptide substrates for assay of aspartyl proteinases
I Y Filippova1, E N Lysogorskaya, V V Anisimova
1Department of Chemistry, Moscow State University, Russia.
Analytical Biochemistry
|February 15, 1996
Summary
New fluorescent peptide substrates were synthesized for assessing aspartyl proteinase activity. These substrates enable sensitive detection of enzyme activity through fluorescence changes, aiding in enzyme research.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Aspartyl proteinases are crucial enzymes involved in various physiological and pathological processes.
- Accurate assessment of aspartyl proteinase activity is essential for understanding their roles and developing therapeutic strategies.
Purpose of the Study:
- To synthesize novel hexapeptide substrates for convenient activity assessment of aspartyl proteinases.
- To develop a sensitive fluorescence-based assay for enzyme activity detection.
Main Methods:
- Chemical and enzymatic synthesis of novel hexapeptide substrates.
- Utilizing fluorescent and quenching moieties for signal generation.
- Hydrolysis of peptide bonds by aspartyl proteinases leading to increased fluorescence.
Main Results:
- Successfully prepared two new hexapeptide substrates: o-aminobenzoyl-Ala-Ala-Phe-Phe-Ala-Ala-p-nitroanilide and N-(o-aminobenzoyl-Ala-Ala-Phe-Phe-Ala-Ala)-N'-2,4-dinitrophenyl ethylenediamine.
- Demonstrated that hydrolysis of the Phe-Phe bond by aspartyl proteinases (porcine pepsin, human pepsin, gastricsin, cathepsin D) leads to a measurable increase in fluorescence.
- Showed that the substrate Abz-Ala-Ala-Phe-Phe-Ala-Ala-Ded is also hydrolyzed by HIV proteinase, suggesting its utility for HIV enzyme assays.
Conclusions:
- The newly synthesized hexapeptide substrates are effective tools for assessing the activity of various aspartyl proteinases.
- The fluorescence-based assay offers a sensitive and convenient method for enzyme activity detection.
- These substrates, particularly Abz-Ala-Ala-Phe-Phe-Ala-Ala-Ded, hold potential for the assay of HIV proteinase, contributing to antiviral research.