Functional characterization of alpha-synuclein protein with antimicrobial activity

Area of Science:

• Neuroscience
• Immunology
• Microbiology

Background:

• Alpha-synuclein (α-Syn) is a protein abundant in neural tissues, associated with Parkinson's disease.
• Its precise role in synaptic vesicle maintenance is unclear, but α-Syn overexpression correlates with innate immune responses.
• Similarities to the antimicrobial peptide (AMP) Amyloid-beta prompted investigation into α-Syn's potential AMP-like functions.

Purpose of the Study:

• To investigate whether alpha-synuclein (α-Syn) possesses antimicrobial peptide (AMP)-like properties.
• To determine if α-Syn exhibits antibacterial and antifungal activities.
• To analyze the localization of α-Syn within microbial cells.

Main Methods:

• Testing the antibacterial activity of α-Syn against Escherichia coli and Staphylococcus aureus.
• Evaluating the antifungal efficacy of α-Syn against Aspergillus flavus, Aspergillus fumigatus, and Rhizoctonia solani.
• Microscopic analysis of recombinant α-Syn protein localization in E. coli and Candida albicans.

Main Results:

• Alpha-synuclein demonstrated significant antibacterial activity against both E. coli and S. aureus.
• α-Syn effectively inhibited the growth of pathogenic fungal strains, including A. flavus, A. fumigatus, and R. solani.
• Localization studies confirmed the presence of α-Syn within E. coli and C. albicans cells.

Conclusions:

• Alpha-synuclein exhibits direct antimicrobial activity against common bacterial and fungal pathogens.
• These findings suggest that α-Syn functions as a natural antimicrobial peptide in addition to its known roles in neurotransmission.
• This dual function of α-Syn has implications for understanding its role in neuroprotection and innate immunity.