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Understanding protease catalysed solid phase peptide synthesis.

Rein V Ulijn1, Nicola Bisek, Peter J Halling

  • 1Department of Chemistry, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh, Scotland, UK EH9 3JJ.

Organic & Biomolecular Chemistry
|August 22, 2003
PubMed
Summary
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Enzyme-catalyzed synthesis of dipeptides using thermolysin on a solid support overcomes aqueous hydrolysis. Reduced hydrophobic hydration of the Fmoc group on the solid support is the primary driver for this remarkable shift toward synthesis.

Area of Science:

  • Biocatalysis
  • Solid-phase synthesis
  • Peptide chemistry

Background:

  • Enzymatic synthesis of peptides in aqueous media is often limited by unfavorable equilibrium favoring hydrolysis.
  • Solid-phase synthesis offers advantages for driving reactions but its application with enzymes in aqueous media is less explored.
  • The use of protecting groups like Fmoc (fluorenylmethyloxycarbonyl) can influence reaction equilibria.

Purpose of the Study:

  • To investigate the direct synthesis of dipeptides from soluble Fmoc-amino acids using thermolysin on a solid support in aqueous media.
  • To understand the factors contributing to the shift in equilibrium towards peptide synthesis.
  • To evaluate the efficiency and yield of this novel synthetic approach.

Main Methods:

  • Direct synthesis of dipeptides using thermolysin immobilized on a PEGA1900 solid support.

Related Experiment Videos

  • Utilizing soluble Fmoc-amino acids as substrates in bulk aqueous media.
  • Analyzing the contribution of mass action, reduced hydrophobic hydration, and electrostatic repulsion to the observed equilibrium shift.

    • Main Results:

    • Successful synthesis of dipeptides in good yields directly on the solid support.
    • Observed a significant shift in equilibrium favoring synthesis, contrary to typical solution-phase hydrolysis.
    • Identified the reduction in unfavorable hydrophobic hydration of the Fmoc group as the most critical factor for the equilibrium shift.

    Conclusions:

    • Solid-phase synthesis with thermolysin provides an effective strategy for dipeptide production in aqueous media.
    • The solid support environment plays a crucial role in overcoming thermodynamic barriers to peptide bond formation.
    • This method offers a promising alternative for enzymatic peptide synthesis, minimizing hydrolysis and maximizing yield.