Two sides of a co(i)ndensate

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Prion-like proteins, such as hnRNPA1, can form dynamic condensates and amyloid fibrils.
• The interplay between condensate formation and fibril aggregation is crucial for understanding cellular processes and disease.

Purpose of the Study:

• To quantify the stability of condensates and fibrils formed from the prion-like low complexity region of hnRNPA1.
• To elucidate the role of condensate interiors in regulating fibril formation.

Main Methods:

• Utilized quantitative stability assays to analyze condensate and fibril formation from hnRNPA1 low complexity regions.
• Investigated protein dynamics and efflux rates within condensates.

Main Results:

• Demonstrated that condensate interiors act as effective sinks for proteins.
• Showed that these sinks suppress fibril growth by significantly slowing protein efflux from the condensates.
• Quantified the stability of both condensates and fibrils under specific conditions.

Conclusions:

• Condensate formation plays a critical role in regulating amyloid fibril aggregation.
• The internal environment of condensates can act as a regulatory mechanism to control the growth of pathological fibrils.
• Findings provide insights into the biophysical mechanisms governing prion-like protein aggregation.