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Chemically Precise Glycoengineering Improves Human Insulin.

Xiaoyang Guan1, Patrick K Chaffey1, Xiuli Wei2

  • 1Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado , Boulder, Colorado 80303, United States.

ACS Chemical Biology
|November 2, 2017
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Summary
This summary is machine-generated.

Researchers synthesized glycosylated insulin for potential oral delivery, a significant advancement for diabetes treatment. This novel approach enhances insulin stability and activity, paving the way for more convenient patient therapies.

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Endocrinology

Background:

  • Diabetes mellitus is a major global health concern with high mortality rates.
  • Current insulin therapy relies on injections, facing patient compliance challenges.
  • Developing an oral insulin formulation remains a significant unmet medical need.

Purpose of the Study:

  • To achieve the first total synthesis of homogeneously glycosylated insulin.
  • To investigate the impact of glycosylation on insulin's stability and activity for oral delivery.
  • To explore glycosylation as a strategy for peptide-based therapeutics.

Main Methods:

  • Total chemical synthesis of homogeneously glycosylated insulin.
  • Characterization of various insulin glycoforms with modified O-glycosylation.
  • Assessment of protease susceptibility and self-association properties.
  • Evaluation of biological activity of modified insulin.

Main Results:

  • Successful synthesis of homogeneously glycosylated insulin.
  • O-mannosylation at B-chain Thr27 significantly reduced protease degradation and self-association.
  • Glycosylated insulin variants maintained full biological activity.
  • Demonstrated glycosylation as a viable strategy for peptide stabilization.

Conclusions:

  • Homogeneously glycosylated insulin represents a promising candidate for oral insulin therapy.
  • Glycosylation can be a general strategy to enhance peptide therapeutic properties.
  • This work overcomes a key hurdle in the clinical translation of glycosylated peptides.