Why Abeta42 Is Much More Toxic Than Abeta40

TL;DR

This paper investigates why Abeta42 is more toxic than Abeta40 by applying thermodynamic scaling theory and docking simulations, focusing on mutational effects and structural factors influencing aggregation and toxicity.

Contribution

It introduces a thermodynamic scaling approach combined with docking simulations to analyze mutational trends and structural factors affecting Abeta peptide toxicity.

Findings

Abeta42 exhibits higher toxicity due to specific structural factors.

Mutations outside Abeta42 influence aggregation and toxicity.

Docking simulations confirm the role of membrane interactions in toxicity.

Abstract

Amyloid precursor with 770 amino acids dimerizes and aggregates, as do its c terminal 99 amino acids and amyloid 40,42 amino acids fragments. The titled question has been discussed extensively, and here it is addressed further using thermodynamic scaling theory to analyze mutational trends in structural factors and kinetics. Special attention is given to Family Alzheimer's Disease mutations outside amyloid 42. The scaling analysis is connected to extensive docking simulations which included membranes, thereby confirming their results and extending them to Amyloid precursor.