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Updated: Apr 16, 2026

Determination of Glucan Chain Length Distribution of Glycogen Using the Fluorophore-Assisted Carbohydrate Electrophoresis FACE Method
Published on: March 31, 2022
A monomer-trimer model supports intermittent glucagon fibril growth
Andrej Košmrlj1, Pia Cordsen2, Anders Kyrsting2
1Harvard University, Department of Physics, 17 Oxford Street, Cambridge, MA 02138, USA.
Abstract:
We investigate in vitro fibrillation kinetics of the hormone peptide glucagon at various concentrations using confocal microscopy and determine the glucagon fibril persistence length 60μm. At all concentrations we observe that periods of individual fibril growth are interrupted by periods of stasis. The growth probability is large at high and low concentrations and is reduced for intermediate glucagon concentrations. To explain this behavior we propose a simple model, where fibrils come in two forms, one built entirely from glucagon monomers and one entirely from glucagon trimers. The opposite building blocks act as fibril growth blockers, and this generic model reproduces experimental behavior well.
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