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• W3195779451 abstract "Abstract Cerebrovascular pathology at the biochemical level has been informed by the study of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), a vascular disorder caused by NOTCH3 mutations. Previous work in CADASIL described N-terminal proteolysis of NOTCH3 generated by specific non-enzymatic cleavage of the first Asp-Pro sequence of the protein. Here, we investigated whether the second Asp-Pro peptide bond (residues 121–122) of NOTCH3 is cleaved in CADASIL. Monospecific antibodies were generated that recognize the neo-epitope predicted to be generated by cleavage after Asp121. These antibodies were used to localize cleavage events at Asp121 in post-mortem CADASIL and control brain tissue and to investigate factors that regulate cleavage at Asp121. We report that cleavage at Asp121 occurs at a high level in the arterial media of CADASIL cerebral arteries. Leptomeningeal arteries demonstrated substantially more cleavage product than penetrating arteries in the white matter, and control vessels harbored only a small amount of cleaved NOTCH3. Proteolysis at Asp121 occurred in purified preparations of NOTCH3 ectodomain, was increased by acidic pH and reductive conditions, and required native protein conformation for cleavage. Increasing the concentration of NOTCH3 EGF-like domain protein elevated the level of proteolysis. On the other hand, several polyanionic chemicals potently blocked cleavage at Asp121. These studies demonstrate that the NOTCH3 protein in CADASIL is cleaved in multiple locations at labile Asp-Pro peptide bonds. As such, chronic brain vascular disease, like other neurodegenerative conditions, features proteolysis of pathological proteins at multiple sites which may generate small pathological peptides." @default.
• W3195779451 created "2021-08-30" @default.
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• W3195779451 date "2021-08-26" @default.
• W3195779451 modified "2023-09-24" @default.
• W3195779451 title "Hydrolysis of a second Asp-Pro site at the N-terminus of NOTCH3 in inherited vascular dementia" @default.
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• W3195779451 doi "https://doi.org/10.1038/s41598-021-96679-9" @default.
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