Heterotypic amyloid interactions: Clues to polymorphic bias and selective cellular vulnerability?

Area of Science:

• Biochemistry
• Structural Biology
• Neuroscience

Background:

• Atomic-resolution structures of disease-associated amyloids have increased, confirming their polymorphic nature.
• Specific amyloid polymorphs are linked to particular proteinopathies, suggesting a role in disease subtypes.
• The mechanisms underlying this association and selective cellular vulnerability remain unclear.

Purpose of the Study:

• To provide an overview of mechanistic insights from patient-derived amyloid structures.
• To discuss the organizational framework of amyloid polymorphism.
• To explore how interactions with the physiological environment influence amyloidogenic proteins and cellular vulnerability.

Main Methods:

• Analysis of recent atomic-resolution structures of disease-associated amyloids.
• Review of literature on amyloid polymorphism and proteinopathies.
• Discussion of heterotypic amyloid interactions and their potential impact.

Main Results:

• Amyloid structures confirm polymorphic nature and association with specific proteinopathies (e.g., tauopathies, synucleinopathies).
• Framework organization of amyloid polymorphism is elucidated.
• Potential for heterotypic amyloid interactions to modify solubility and assembly is discussed.

Conclusions:

• Amyloid polymorphism is a potential marker for specific pathological subtypes.
• Interactions between amyloids and the physiological environment may alter protein behavior.
• These interactions could contribute to selective cellular vulnerability in proteinopathies.