Mechanical properties of the two-filament insulin amyloid fibril: a theoretical study

TL;DR

This paper combines recent simulation and experimental data to analyze the mechanical properties of insulin amyloid fibrils, linking nanoscale measurements to their molecular structure and proposing mechanisms for fibril elasticity.

Contribution

It provides a theoretical analysis connecting mechanical measurements with the fibril's molecular structure, highlighting hydrogen bond breakage during stretching.

Findings

Persistence length aligns with the structural model

Stretching involves hydrogen bond breakage

Nanoscale measurements inform microscopic structure

Abstract

We study the two-filament insulin fibril's structure by incorporating recent simulation results and mechanical measurements. Our investigation suggests that the persistence length measurement correlates well with the previously proposed structural model, while the elasticity measurement suggests that stretching the fibril may involve hydrogen bond breakage. Our work illustrates an attempt to correlate nanoscale measurements with microscopic information on the quaternary protein structure.