Prion-like polymerization as a signaling mechanism.

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• The innate immune system relies on pattern recognition receptors (PRRs) like RIG-I and NLRP3 to detect pathogens and danger signals.
• Activation of PRRs initiates signaling cascades, leading to cytokine production crucial for host defense.
• MAVS and ASC are key adaptor proteins downstream of RIG-I and NLRP3, respectively, possessing death domain superfamily N-terminal regions.

Approach:

• This review examines recent findings on MAVS and ASC forming functional prion-like fibers via their death domains.
• The study discusses the concept of prion-like polymerization as a mechanism in signal transduction pathways.
• Potential benefits of this polymerization strategy, such as signal amplification and molecular memory, are explored.

Key Points:

• Adaptor proteins MAVS and ASC can form prion-like fibers, suggesting a novel signaling mechanism.
• Prion-like polymerization is emerging as a significant strategy in cellular signal transduction.
• This process may enhance immune signaling, provide evolutionary advantages, and establish molecular memory.

Conclusions:

• Prion-like fiber formation by MAVS and ASC represents a unique mode of innate immune signal propagation.
• Understanding prion-like polymerization in signal transduction offers insights into host defense mechanisms.
• This strategy potentially contributes to enhanced immune responses, evolutionary fitness, and cellular memory.