Surveying Bacterial Microcompartment Core Enzymes to Identify Prospective Encapsulation Peptides and Principles of...

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Bacterial microcompartments (BMCs) are protein-bound organelles in prokaryotes.
• BMCs encapsulate enzymatic cores for specialized metabolic functions.
• While carboxysome function is known, metabolosome enzyme interactions are understudied.

Purpose of the Study:

• Investigate encapsulation peptide (EP)-mediated interactions in glycyl radical enzyme-associated (GRM) BMCs.
• Characterize enzyme-enzyme (core-core) and enzyme-shell (shell-core) interactions within GRM BMCs.
• Elucidate the role of EPs in mediating these interactions.

Main Methods:

• Systematic and comparative investigation of EP-mediated interactions.
• Analysis of five distinct GRM BMC types.
• Identification of novel protein-protein interactions within BMCs.

Main Results:

• Eleven novel core-core interactions were identified.
• One novel shell-core interaction was discovered.
• EPs were found to mediate a significant portion of these core-core interactions.

Conclusions:

• EPs play a crucial role in mediating enzyme-enzyme interactions within GRM BMC cores.
• These findings enhance understanding of BMC assembly mechanisms.
• The results may inform future biotechnological applications of BMCs.