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Related Experiment Videos

Shortened insulin with enhanced in vitro potency.

M Casaretto, M Spoden, C Diaconescu

    Biological Chemistry Hoppe-Seyler
    |June 1, 1987
    PubMed
    Summary

    Removing the C-terminal B26-B30 peptide from insulin can enhance potency. Substituting specific residues, like histidine or tyrosine at B25, significantly boosts insulin activity, offering new therapeutic possibilities.

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    Area of Science:

    • Biochemistry
    • Endocrinology
    • Protein Chemistry

    Background:

    • Insulin's biological activity is maintained after C-terminal residue removal (B26-B30) if amidated.
    • Further modifications to this shortened insulin structure can potentially enhance its potency.

    Purpose of the Study:

    • To investigate the impact of specific amino acid substitutions at positions B24 and B25 on the biological activity of des-(B26-B30)-insulin-B25-amide.
    • To explore structure-activity relationships in modified insulin analogues.

    Main Methods:

    • Trypsin-mediated semi-synthesis was used to create seven analogues of des-(B26-B30)-insulin-B25-amide.
    • Analogues featured substitutions such as D-Phe at B24, and His, D-Phe, Trp, or Tyr at B25, including double substitutions.

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    Main Results:

    • Conversion of B25-phenylalanine's configuration reduced in vitro potency to 0.5%.
    • Substitution with histidine or tyrosine at B25 increased activity to 310% and 230%, respectively.
    • Circular dichroism (CD) spectra of analogues were similar, despite significant activity differences, and distinct from native insulin.

    Conclusions:

    • The C-terminal pentapeptide of insulin modulates the role of residues B24/B25 in receptor binding and activity.
    • Specific substitutions, particularly histidine and tyrosine at B25, can significantly enhance insulin analogue potency.
    • Structural analysis via CD spectra does not fully correlate with observed functional activity changes in these shortened insulin analogues.