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Related Experiment Videos

Synthetic probes for the alpha-factor receptor.

F Naider1, A Yaron, A Ewenson

  • 1Department of Chemistry, College of Staten Island, CUNY 10314.

Biopolymers
|January 1, 1990
PubMed
Summary

Researchers developed methods to synthesize modified alpha-factor peptides for studying yeast mating pheromone receptor interactions. These probes, including those with radioactive and affinity tags, aid in understanding peptide hormone binding.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Peptide Chemistry

Background:

  • Peptide hormone-receptor interactions are crucial in cellular signaling.
  • The yeast mating pheromone alpha-factor and its receptor provide a model system for studying these interactions.
  • Developing effective probes is essential for dissecting the molecular mechanisms of hormone binding.

Purpose of the Study:

  • To develop strategies for synthesizing modified alpha-factor peptides.
  • To create probes with radioactive and affinity tags for investigating the alpha-factor receptor binding site.
  • To characterize the synthesis and biological activity of these novel peptide probes.

Main Methods:

  • Selective acylation of [Nle12]-alpha-factor using the diiodo Bolton-Hunter reagent under varying pH and solvent conditions.

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  • Utilized citraconic anhydride for preferential alpha-acylation and temporary masking.
  • Incorporated biotin or diiodo Bolton-Hunter reagents during solid-phase peptide synthesis and subsequent cleavage with hydrogen fluoride (HF).

    • Main Results:

    • Demonstrated pH and solvent-dependent preferential acylation of alpha- or epsilon-amines in [Nle12]-alpha-factor.
    • Successfully synthesized alpha-factor analogs with affinity tags (biotin, diiodo Bolton-Hunter reagent) and radioactive labels.
    • Characterized synthetic peptides using HPLC, enzymatic methods, and mass spectrometry, confirming biological activity via growth arrest assays.

    Conclusions:

    • Established versatile synthetic routes for producing tagged alpha-factor probes.
    • These probes are valuable tools for elucidating the alpha-factor receptor binding site.
    • The study advances the understanding of peptide hormone-receptor interactions through chemical biology approaches.