Thrombin reshapes α-synuclein biochemical properties by N-terminal truncation
Abstract
Proteolytic processing of α-Synuclein (Syn) contributes to the molecular diversity and toxicity of its aggregates in Parkinson’s disease, yet the proteases responsible for disease-relevant truncations remain incompletely defined. Here, we show that thrombin, a serine protease associated with inflammatory conditions, selectively cleaves Syn at Lys6–Gly7, generating a 7–140 fragment despite the presence of multiple potential cleavage sites. Cleavage is modulated by ionic strength and the conformational ensemble of Syn, with more extended states being preferentially cleaved. The resulting 7–140 fragment adopts a more compact conformational ensemble, delays the formation of aggregation-prone species, produces fibrils with altered morphology and shows reduced membrane-induced α-helix formation. Although 7–140 aggregates are modestly less toxic, the truncation also impairs physiological functions of the protein. These findings describe a mechanism by which an inflammation-associated protease, thrombin, may contribute to Parkinson’s disease by selectively modifying Syn structure, aggregation and function.
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BibTeX
@article{trolese2026thrombin,
title = {{Thrombin reshapes α-synuclein biochemical properties by N-terminal truncation}},
author = {Philipp Trolese and Benedetta Fongaro and Alberto Benetollo and Vittoria Scapin and Martina Scano and Elena Rampazzo and Alice Sosic and Dorianna Sandonà and Laura Acquasaliente and Patrizia Polverino de Laureto},
journal = {Nature Communications},
year = {2026},
month = oct,
doi = {10.1038/s41467-026-78990-z},
url = {https://www.nature.com/articles/s41467-026-78990-z},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Thrombin reshapes α-synuclein biochemical properties by N-terminal truncation
AU - Philipp Trolese
AU - Benedetta Fongaro
AU - Alberto Benetollo
AU - Vittoria Scapin
AU - Martina Scano
AU - Elena Rampazzo
AU - Alice Sosic
AU - Dorianna Sandonà
AU - Laura Acquasaliente
AU - Patrizia Polverino de Laureto
PY - 2026
DA - 2026/10/28
JO - Nature Communications
DO - 10.1038/s41467-026-78990-z
UR - https://www.nature.com/articles/s41467-026-78990-z
AB - Proteolytic processing of α-Synuclein (Syn) contributes to the molecular diversity and toxicity of its aggregates in Parkinson’s disease, yet the proteases responsible for disease-relevant truncations remain incompletely defined. Here, we show that thrombin, a serine protease associated with inflammatory conditions, selectively cleaves Syn at Lys6–Gly7, generating a 7–140 fragment despite the presence of multiple potential cleavage sites. Cleavage is modulated by ionic strength and the conformational ensemble of Syn, with more extended states being preferentially cleaved. The resulting 7–140 fragment adopts a more compact conformational ensemble, delays the formation of aggregation-prone species, produces fibrils with altered morphology and shows reduced membrane-induced α-helix formation. Although 7–140 aggregates are modestly less toxic, the truncation also impairs physiological functions of the protein. These findings describe a mechanism by which an inflammation-associated protease, thrombin, may contribute to Parkinson’s disease by selectively modifying Syn structure, aggregation and function.
SN - 2041-1723
ER -