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Related Experiment Videos

An improved procedure for N- to C-directed (Inverse) solid-phase peptide synthesis.

A Johansson1, E Akerblom, K Ersmark

  • 1Department of Organic Pharmaceutical Chemistry, Uppsala University, BMC, Box 574, SE-751 23 Uppsala, Sweden.

Journal of Combinatorial Chemistry
|October 13, 2000
PubMed
Summary

This study presents an optimized solid-phase peptide synthesis method using amino acid tri-tert-butoxysilyl (Sil) esters and HATU coupling reagent. The new approach achieves good yields and low epimerization for synthesizing short peptides.

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Synthetic Chemistry

Background:

  • Solid-phase peptide synthesis (SPPS) is crucial for producing peptides.
  • Minimizing epimerization and maximizing coupling efficiency are key challenges in SPPS.
  • Amino acid protecting groups and coupling reagents significantly impact SPPS outcomes.

Purpose of the Study:

  • To develop an optimized N- to C-direction solid-phase peptide synthesis method.
  • To achieve high coupling yields and low epimerization using specific reagents.
  • To improve the synthesis of amino acid tri-tert-butoxysilyl (Sil) ester building blocks.

Main Methods:

  • Coupling of resin-bound C-terminal amino acids with excess amino acid tri-tert-butoxysilyl (Sil) esters.
  • Utilizing HATU as the coupling reagent and 2,4,6-trimethylpyridine (TMP) as the base.

Related Experiment Videos

  • Investigating various combinations of activating agents, bases, solvents, and epimerization suppressants like cupric chloride.

    • Main Results:

    • The optimized method yielded good coupling efficiency with typically 5% epimerization for most amino acids.
    • Serine derivatives showed higher epimerization (ca. 20%).
    • Cupric chloride reduced epimerization but also decreased resin loading and caused cleavage.

    Conclusions:

    • The developed method offers an attractive alternative for solid-phase synthesis of short peptides (≤6 residues).
    • Amino acid Sil esters are stable as hydrochlorides, facilitating their use as building blocks.
    • The procedure is suitable for applications like peptide library synthesis.