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Enzymic peptide synthesis in microaqueous, solvent-free systems
P Kuhl1, U Elchhorn, H D Jakubke
1Technical University of Dresden, Institute of Biochemistry, Mommsenstrasse 13, D-01062 Dresden, Germany.
Biotechnology and Bioengineering
|February 5, 1995
Summary
Enzyme-catalyzed peptide synthesis using thermolysin and chymotrypsin was achieved without organic solvents, utilizing microaqueous conditions. This solvent-free approach yielded high amounts of peptide amides, demonstrating efficient enzymatic synthesis.
Area of Science:
- Biocatalysis
- Enzymatic Synthesis
- Green Chemistry
Background:
- Traditional peptide synthesis often relies on organic solvents, posing environmental and cost concerns.
- Enzymatic catalysis offers a greener alternative for peptide bond formation.
- Developing solvent-free enzymatic methods is crucial for sustainable chemical synthesis.
Purpose of the Study:
- To investigate the feasibility of thermolysin- and chymotrypsin-catalyzed peptide synthesis in microaqueous, solvent-free systems.
- To optimize reaction parameters for maximizing peptide amide yields.
- To explore the application of sonication and fluidization techniques in enzymatic peptide synthesis.
Main Methods:
- Enzymatic synthesis of peptide amides using thermolysin (EC 3.4.24.4) and chymotrypsin (EC 3.4.21.1).
- Reactions were conducted in microaqueous, solvent-free conditions with low water content.
- Sonication and fluidized-bed reactors were employed to facilitate the reactions.
- Optimization of parameters including reaction time, enzyme concentration, water content, and substrate ratio.
Main Results:
- High yields (up to 87%) of Z-Phe-Leu-NH(2) were achieved via thermolysin catalysis under sonication.
- Tripeptide derivatives (Ac-Xaa-Trp-Leu-NH(2)) were synthesized with good yields (79% for Xaa=Gly, 71% for Xaa=Ala) and no observed hydrolysis.
- Fluidized-bed reactor systems enabled the synthesis of N-protected di- and tripeptide amides with yields ranging from 10% to 40%.
Conclusions:
- Enzymatic peptide synthesis is effective in microaqueous, solvent-free media using sonication or fluidization.
- These green chemistry approaches minimize organic solvent use and side reactions.
- The study demonstrates a viable pathway for sustainable production of peptide amides.
