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2017 ; 7
(1
): 5949
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Identification of proteins that specifically recognize and bind protofibrillar
aggregates of amyloid-?
#MMPMID28729665
Wahlberg E
; Rahman MM
; Lindberg H
; Gunneriusson E
; Schmuck B
; Lendel C
; Sandgren M
; Löfblom J
; Ståhl S
; Härd T
Sci Rep
2017[Jul]; 7
(1
): 5949
PMID28729665
show ga
Protofibrils of the 42 amino acids long amyloid-? peptide are transient
pre-fibrillar intermediates in the process of peptide aggregation into amyloid
plaques and are thought to play a critical role in the pathology of Alzheimer's
disease. Hence, there is a need for research reagents and potential diagnostic
reagents for detection and imaging of such aggregates. Here we describe an in
vitro selection of Affibody molecules that bind to protofibrils of A?(42)cc,
which is a stable engineered mimic of wild type A?(42) protofibrils. Several
binders were identified that bind A?(42)cc protofibrils with low nanomolar
affinities, and which also recognize wild type A?(42) protofibrils. Dimeric
head-to-tail fusion proteins with subnanomolar binding affinities, and very slow
dissociation off-rates, were also constructed. A mapping of the chemical
properties of the side chains onto the Affibody scaffold surface reveals three
distinct adjacent surface areas of positively charged surface, nonpolar surface
and a polar surface, which presumably match a corresponding surface epitope on
the protofibrils. The results demonstrate that the engineered A?(42)cc is a
suitable antigen for directed evolution of affinity reagents with specificity for
wild type A?(42) protofibrils.