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Related Experiment Videos

Side reactions in solid-phase peptide synthesis and their applications

K H Hsieh1, M M Demaine, S Gurusidaiah

  • 1Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, USA.

International Journal of Peptide and Protein Research
|September 1, 1996
PubMed
Summary

Side reactions in peptide synthesis, like transesterification and acetylation, can be minimized. Optimizing synthesis and cleavage conditions improved peptide yield and revealed the importance of modified side-chains in bioassays.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Biochemistry

Background:

  • Side reactions in peptide synthesis present challenges for yield and purity.
  • These reactions also offer opportunities for creating structurally diverse peptides for combinatorial design.

Purpose of the Study:

  • To identify and characterize side reactions during solid-phase peptide synthesis.
  • To investigate methods for eliminating or controlling these side reactions.
  • To explore the utility of side-reaction products in bioassays.

Main Methods:

  • Solid-phase peptide synthesis of Boc-DKKREE and GPR peptides.
  • Model experiments to study transesterification and acetylation reactions.
  • Catalytic hydrogenation for peptide cleavage.

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  • Optimization of reaction conditions using different catalysts and solvents.

    • Main Results:

    • Transesterification of Boc-Glu(OBzl) by TMAH was observed.
    • Acetylation of Boc-Arg(NO2)-resin occurred with Ac2O/Et3N.
    • His- and Lys-modification occurred during Pd(OAc)2-catalyzed hydrogenation.
    • Optimized conditions (Cs-derived resin, NMP-HOPr cleavage) increased GHRPLDKKREE yield by 1/3.
    • Bioassays of modified peptides showed differential importance of modified side-chains.

    Conclusions:

    • Side reactions in peptide synthesis can be controlled through optimized conditions.
    • Eliminating side reactions significantly improves peptide yield.
    • Modified peptides generated through side reactions can provide valuable biological insights.