Protein thermal sensing regulates physiological amyloid aggregation

Area of Science:

• Cellular biology
• Biochemistry
• Molecular biology

Background:

• Eukaryotic cells form RNA-seeded subnuclear condensates called amyloid bodies (A-bodies) to respond to environmental stressors.
• The composition of A-bodies varies with different stressors, indicating a selective protein aggregation mechanism for tailored cellular responses.

Purpose of the Study:

• To identify structural elements regulating heat shock-induced amyloid aggregation in A-bodies.
• To understand how protein structure influences selective aggregation within A-bodies under thermal stress.

Main Methods:

• Investigated heat shock-specific amyloid aggregation.
• Manipulated structural pockets within proteins constituent to A-bodies.
• Analyzed the effect of these manipulations on A-body targeting at elevated temperatures.

Main Results:

• Specific structural pockets in proteins were identified as critical for heat shock-induced A-body aggregation.
• Altering these structural pockets could either promote or inhibit protein targeting to A-bodies at high temperatures.
• Protein thermal stability, influenced by temperature-sensitive regions, appears to mediate selective aggregation.

Conclusions:

• Selective protein aggregation in A-bodies is regulated by protein thermal stability and temperature-sensitive structural elements.
• This mechanism provides a rapid, stress-specific cellular response for controlling physiological amyloid aggregation.
• The findings suggest a novel form of post-translational regulation impacting cellular stress responses.