Recent trends in protease-catalyzed peptide synthesis

Area of Science:

• Biocatalysis
• Enzymology
• Organic Synthesis

Background:

• Enzymatic peptide synthesis can be thermodynamically or kinetically controlled, with the latter limited to serine and cysteine proteases.
• Current industrial applications are limited, with only aspartame production and insulin conversion widely established.
• Existing methods offer stereospecificity and avoid side chain protection but have drawbacks hindering broader use.

Purpose of the Study:

• To review recent advancements in enzymatic peptide synthesis.
• To highlight new strategies for overcoming limitations in enzymatic peptide synthesis.
• To provide examples of innovative approaches in recent literature.

Main Methods:

• Exploring proteases with enhanced specificity.
• Employing protease engineering to favor synthesis over hydrolysis.
• Developing mimetic or inverse substrates to prevent product degradation.
• Investigating changes in reactant physical states, including solid-state reactions and enzyme immobilization (e.g., cross-linked enzyme crystals).
• Modifying experimental conditions, such as heterogeneous catalysis, low-water organic solvents, ionic liquids, and subzero temperatures.

Main Results:

• Significant improvements in protease specificity and engineering for synthesis.
• Development of strategies to limit further hydrolysis of synthesized peptides.
• Successful application of altered physical states and reaction conditions, including heterogeneous catalysis and low-water environments.
• Demonstration of feasibility through examples in recent scientific literature.

Conclusions:

• Recent innovations are expanding the scope and efficiency of enzymatic peptide synthesis.
• New approaches in enzyme engineering, substrate design, and reaction conditions are crucial for industrial viability.
• The field is moving towards more robust and versatile enzymatic peptide synthesis methodologies.