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Pepsin behavior as a catalyst in equilibrium-controlled peptide synthesis.
Filippova IYu1, E N Lysogorskaya, V V Anisimova
1Chemistry Department of Moscow State University, USSR.
Biomedica Biochimica Acta
|January 1, 1991
Summary
During peptide synthesis, pepsin enzyme gets trapped in the product gel, losing its liquid phase presence but retaining activity. This entrapment affects other enzymes too, limiting proteinase efficiency in synthesis.
Area of Science:
- Biochemistry
- Enzymology
- Chemical Synthesis
Background:
- Enzymes like pepsin are crucial for catalyzing peptide synthesis.
- Enzyme stability and recovery are key challenges in biocatalytic processes.
- Product-induced enzyme precipitation can limit reaction efficiency.
Purpose of the Study:
- To investigate the mechanism of pepsin loss during hexapeptide synthesis.
- To determine if enzyme entrapment is specific to pepsin.
- To assess the impact of co-precipitation on proteinase efficiency in peptide synthesis.
Main Methods:
- Equilibrium peptide synthesis using pepsin as a catalyst.
- Analysis of enzyme distribution between liquid and solid phases.
- Addition of inert proteins (lysozyme, ribonuclease A, carbonic anhydrase) to assess co-precipitation.
Main Results:
- Pepsin was gradually removed from the liquid phase via entrapment in the hexapeptide gel.
- The enzyme retained its catalytic activity despite precipitation.
- Non-specific co-precipitation of inert proteins (lysozyme, ribonuclease A, carbonic anhydrase) with the hexapeptide was observed.
Conclusions:
- Enzyme entrapment in the product gel is a significant factor limiting pepsin efficiency in peptide synthesis.
- This phenomenon is not specific to pepsin and affects other proteins.
- Co-precipitation of proteinases may be a general limitation for enzyme-catalyzed peptide synthesis.