Forcing nonamyloidogenic beta-synuclein to fibrillate.

Area of Science:

• Biochemistry
• Neuroscience
• Environmental Science

Background:

• Alpha-synuclein fibrillation forms Lewy bodies, implicated in Parkinson's disease.
• Beta-synuclein, a homologue of alpha-synuclein, inhibits alpha-synuclein fibrillation.
• Both proteins are natively unfolded and found in neuronal presynaptic terminals.

Purpose of the Study:

• To investigate factors that induce beta-synuclein aggregation and fibrillation.
• To explore the potential role of environmental factors in beta-synuclein's amyloidogenic transformation.
• To understand how beta-synuclein's behavior changes in the presence of alpha-synuclein and other agents.

Main Methods:

• Inducing beta-synuclein aggregation using metals (Zn2+, Pb2+, Cu2+), pesticides, and organic solvents.
• Analyzing the conformational changes and fibrillation kinetics of beta-synuclein.
• Studying the effects of glycosaminoglycans and crowding agents on metal-induced fibrillation.
• Examining mixed alpha- and beta-synuclein fibrillation in the presence of metals.

Main Results:

• Metals induced a partially folded, rapidly fibrillating conformation of beta-synuclein.
• Mixtures of alpha- and beta-synuclein showed rapid fibrillation with metals.
• Glycosaminoglycans and crowding agents accelerated metal-induced beta-synuclein fibrillation.
• Pesticides induced soluble oligomers and fibrils, while organic solvents caused amorphous aggregates.

Conclusions:

• Beta-synuclein can undergo rapid fibrillation under specific conditions, contrary to previous understanding.
• Environmental pollutants, such as metals and pesticides, can trigger an amyloidogenic conformation in beta-synuclein.
• These findings highlight a potential mechanism linking environmental exposure to neurodegenerative processes involving protein aggregation.