Insulin Amyloid Fibrils and Their Helical Structure
Author Information
Author(s): Bente Vestergaard, Minna Groenning, Manfred Roessle, Jette S. Kastrup, Marco van de Weert, James M. Flink, Sven Frokjaer, Michael Gajhede, Dmitri I. Svergun
Primary Institution: Department of Medicinal Chemistry, University of Copenhagen, Copenhagen, Denmark
Hypothesis
The helical oligomer is the structural nucleus and elongating unit in insulin amyloid fibrillation.
Conclusion
The study reveals that a helical oligomer acts as both the structural nucleus and the primary elongating unit in the formation of insulin amyloid fibrils.
Supporting Evidence
- The study identified three major components in insulin fibrillation: monomers, mature fibrils, and a helical oligomer.
- The growth rate of fibrils was found to be proportional to the amount of helical oligomer present in solution.
- The helical oligomer was characterized as a structural nucleus that accumulates above supercritical concentrations.
Takeaway
This study found that a special structure made of insulin helps it grow into long chains called fibrils, which are important in diseases like diabetes.
Methodology
The study used small-angle x-ray scattering (SAXS) to analyze the fibrillation process of insulin in solution.
Limitations
The study's findings are based on low-resolution data, which may not capture all structural details.
Digital Object Identifier (DOI)
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