A blueprint for biomolecular condensation driven by bacterial microcompartment encapsulation peptides

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Bacterial microcompartments are protein organelles with specialized metabolic functions.
• Their diversity arises from enzymatic cores within conserved protein shells.
• Encapsulation peptides mediate cargo segregation into these microcompartments.

Purpose of the Study:

• To investigate how encapsulation peptides drive multicomponent cargo assembly into biomolecular condensates.
• To understand the molecular mechanisms underlying peptide-mediated condensation.
• To explore the potential of encapsulation peptides in biotechnology.

Main Methods:

• In vitro experiments.
• Molecular dynamics simulations.
• Analysis of peptide-protein interactions and topological rearrangements.

Main Results:

• Conserved hydrophobic packing and electrostatic interactions stabilize trimeric encapsulation peptide bundles.
• Topological rearrangements enable programmable liquid- or gel-like partitioning.
• Partitioning is peptide-specific, modular, and can co-assemble multiple reporters.

Conclusions:

• Encapsulation peptides are key drivers of biomolecular condensation.
• Understanding their molecular features provides a blueprint for implementing encapsulation peptide biotechnology.
• This work facilitates the design of novel biotechnological tools.