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Related Experiment Videos

Solid-phase synthesis of peptide-4-nitroanilides

A Kaspari1, A Schierhorn, M Schutkowski

  • 1Max Planck Institute For the Advancement of Science, Research Unit on Enzymology of Peptide Bond, Halle, Germany.

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

A novel Fmoc-based solid-phase synthesis strategy enables rapid creation of diverse peptide-4-nitroanilides. These peptides serve as substrates for subtilisin Carlsberg protease and peptidyl-prolyl cis/trans-isomerases, with hydrophobic residues enhancing cleavage.

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Proteomics

Background:

  • Peptide synthesis is crucial for biochemical research.
  • Developing efficient solid-phase synthesis (SPPS) strategies is an ongoing challenge.
  • Chromogenic peptide substrates are valuable tools for enzyme activity assays.

Purpose of the Study:

  • To develop a versatile Fmoc-based SPPS strategy for synthesizing peptide-4-nitroanilides.
  • To create novel peptide substrates for proteases and isomerases.
  • To investigate the substrate specificity of subtilisin Carlsberg.

Main Methods:

  • Fmoc-based solid-phase synthesis using side-chain carboxyl groups for anchoring.
  • Preparation of Fmoc-Glu-NH-Np and Fmoc-Asp-NH-Np synthons.

Related Experiment Videos

  • Synthesis of peptide sequences Suc-Ala-Phe-Pro-Xaa-NH-Np and Ala-Ala-Xaa-Pro-Gln-NH-Np.
  • Enzyme assays using subtilisin Carlsberg and peptidyl-prolyl cis/trans-isomerases.
  • Electrospray ionization mass spectrometry (ESI-MS) for hydrolysis analysis.

    • Main Results:

    • Successfully synthesized various Glu/Asp and Gln-containing peptide-4-nitroanilides.
    • Demonstrated that synthesized peptides are substrates for subtilisin Carlsberg and PPIases.
    • Identified that peptides with hydrophobic residues (Phe, Tyr, Leu, Val) at the P3 position are rapidly cleaved by subtilisin Carlsberg.
    • Observed no hydrolysis of the Gln-NH-Np bond in Ala-Ala-Pro-Pro-Gln-NH-Np.

    Conclusions:

    • The developed Fmoc-based SPPS strategy is efficient for synthesizing diverse peptide-arylamides.
    • The synthesized peptides are valuable tools for studying protease and isomerase activity.
    • Subtilisin Carlsberg exhibits specificity towards hydrophobic residues in the P3 position of peptide substrates.