The cellular modifier MOAG-4/SERF drives amyloid formation through charge complementation.

Area of Science:

• Molecular Biology
• Aging Research
• Biochemistry

Background:

• Protein aggregation is linked to aging and neurodegenerative diseases.
• Cellular modifiers like MOAG-4 and SERF2 influence protein aggregation and toxicity.
• The precise mechanisms of proteotoxicity remain incompletely understood.

Purpose of the Study:

• To elucidate the cellular mechanisms underlying proteotoxicity mediated by aggregation-prone proteins.
• To investigate the role of MOAG-4 and SERF2 in protein aggregation and age-related diseases.
• To identify potential therapeutic targets for reducing age-related protein toxicity.

Main Methods:

• Peptide array screening of human amyloidogenic proteins to identify interaction sites with SERF2.
• Biochemical assays to assess the impact of charge neutralization on SERF2's amyloid-promoting activity.
• Genetic manipulation in Caenorhabditis elegans models to study the in vivo effects of MOAG-4 charge neutralization on protein aggregation and toxicity.

Main Results:

• SERF2 specifically interacts with negatively charged and hydrophobic aromatic amino acid segments in aggregation-prone proteins.
• Eliminating these interaction sites or neutralizing positive charges on SERF2 abolished its amyloid-promoting activity.
• Mutating the MOAG-4 locus to neutralize charge significantly suppressed protein aggregation and toxicity in C. elegans models.
• These findings indicate that charge interactions between cellular modifiers and aggregation-prone proteins drive proteotoxicity.

Conclusions:

• MOAG-4 and SERF2 promote protein aggregation and toxicity through charge-based interactions with aggregation-prone proteins.
• These charge interactions may accelerate amyloid nucleation by altering protein structure and reducing colloidal stability.
• Targeting these charge interactions presents a promising strategy for therapeutic interventions against age-related protein toxicity.