Cross-β Polymerization of Low Complexity Sequence Domains.

Area of Science:

• Molecular Biology
• Biochemistry
• Genomics

Background:

• Eukaryotic genomes encode numerous transcription factors and RNA regulatory proteins.
• Many of these proteins feature intrinsically disordered, prion-like, or low-complexity (LC) domains.
• These LC domains are typically unfolded when proteins are studied in isolation.

Purpose of the Study:

• To explore the potential biological utility of polymers formed by LC domains.
• To investigate the behavior of purified LC domains under specific incubation conditions.

Main Methods:

• Biochemical isolation of DNA and RNA regulatory proteins.
• Purification and incubation of LC domains.
• Analysis of protein polymerization into amyloid-like fibers.

Main Results:

• Purified LC domains from various eukaryotic proteins were studied.
• Upon incubation, many of these LC domains polymerized into homogeneous, labile amyloid-like fibers.
• Evidence suggests a potential biological role for these LC domain polymers.

Conclusions:

• LC domains, often considered disordered, exhibit polymerization capabilities.
• The formation of amyloid-like fibers by LC domains may indicate a functional role in cellular processes.
• Further investigation is warranted to elucidate the biological significance of LC domain polymerization.