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Peptide N-alkylamides by solid phase synthesis.

W Kornreich, H Anderson, J Porter

    International Journal of Peptide and Protein Research
    |April 1, 1985
    PubMed
    Summary
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    New resins enable solid-phase synthesis of peptide N-alkylamides. This method efficiently produces Gonadotropin-releasing hormone (GnRH) analogs, with one analog showing threefold increased potency in releasing luteinizing hormone (LH).

    Area of Science:

    • Organic Chemistry
    • Peptide Chemistry
    • Medicinal Chemistry

    Background:

    • Solid-phase peptide synthesis (SPPS) is a cornerstone of peptide production.
    • Developing efficient methods for synthesizing modified peptides, such as C-terminal peptide N-alkylamides, remains an active area of research.
    • Gonadotropin-releasing hormone (GnRH) analogs are crucial for reproductive medicine and endocrinology.

    Purpose of the Study:

    • To develop novel resins for the solid-phase synthesis of C-terminal peptide N-alkylamides.
    • To demonstrate the utility of these resins in synthesizing GnRH analogs.
    • To evaluate the biological activity of newly synthesized GnRH analogs.

    Main Methods:

    • Preparation of three new polystyrene-based resins functionalized with different alkylamines.

    Related Experiment Videos

  • Solid-phase synthesis of C-terminal peptide N-alkylamides using Boc amino acids and standard protecting groups.
  • Cleavage and deprotection using hydrogen fluoride (HF).
  • Synthesis and characterization of GnRH analogs, including [DGlu6, Pro9-NHCH2CH3]-GnRH.
  • In vitro testing of GnRH analogs for luteinizing hormone (LH) release from rat anterior pituitary cells.

    • Main Results:

    • The developed resins successfully facilitated the solid-phase synthesis of C-terminal peptide N-alkylamides.
    • A novel analog, [DGlu6, Pro9-NHCH2CH3]-GnRH, was synthesized and found to be three times more potent than [DGlu6]-GnRH in stimulating LH release.
    • Other synthesized GnRH analogs exhibited equipotency and comparable properties (HPLC, amino acid analysis, specific rotation) to those obtained via alternative methods.
    • Equivalent or improved yields were achieved compared to previous synthetic strategies.

    Conclusions:

    • The newly developed resins offer a versatile and efficient approach for the solid-phase synthesis of C-terminal peptide N-alkylamides.
    • This methodology enables the streamlined production of potent GnRH analogs with potential therapeutic applications.
    • The findings highlight the significance of C-terminal modifications in modulating peptide hormone activity.