Structural Mapping of Oligomeric Intermediates in an Amyloid Assembly Pathway

Overview

Journal Elife

Specialty Biology

Date 2019 Sep 26

PMID 31552823

Citations 30

Authors

Theodoros K Karamanos

Matthew P Jackson

Antonio N Calabrese

Sophia C Goodchild

Emma E Cawood

Gary S Thompson

Arnout P Kalverda

Eric W Hewitt

Sheena E Radford

Affiliations

Soon will be listed here.

Abstract

Transient oligomers are commonly formed in the early stages of amyloid assembly. Determining the structure(s) of these species and defining their role(s) in assembly is key to devising new routes to control disease. Here, using a combination of chemical kinetics, NMR spectroscopy and other biophysical methods, we identify and structurally characterize the oligomers required for amyloid assembly of the protein ΔN6, a truncation variant of human β-microglobulin (βm) found in amyloid deposits in the joints of patients with dialysis-related amyloidosis. The results reveal an assembly pathway which is initiated by the formation of head-to-head non-toxic dimers and hexamers to amyloid fibrils. Comparison with inhibitory dimers shows that precise subunit organization determines amyloid assembly, while dynamics in the C-terminal strand hint to the initiation of cross-β structure formation. The results provide a detailed structural view of early amyloid assembly involving structured species that are not cytotoxic.

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