Characterization of a widespread sugar phosphate-processing bacterial microcompartment.

Area of Science:

• Microbiology
• Biochemistry
• Structural Biology

Background:

• Prokaryotes utilize Bacterial Microcompartments (BMCs) to compartmentalize metabolic pathways, enhancing catalytic efficiency.
• Metabolosomes, a type of catabolic BMC, have functions determined by their signature enzyme, but the prevalent Sugar Phosphate Utilizing (SPU) BMC remains uncharacterized.
• SPU BMCs are found ubiquitously across diverse bacterial habitats.

Purpose of the Study:

• To define the fundamental characteristics of SPU BMCs.
• To bioinformatically characterize SPU subtypes and identify their unique enzymes.
• To express, purify, and biochemically characterize key SPU BMC enzymes.

Main Methods:

• Bioinformatic analysis of seven SPU subtypes.
• Heterologous expression and purification of SPU core enzymes.
• Biochemical assays to determine enzyme activity and interactions.

Main Results:

• Seven SPU BMC subtypes were identified, all containing a unique deoxyribose 5-phosphate aldolase (DERA).
• A catalytically active DERA enzyme was expressed and purified, forming a complex with ribose 5-phosphate isomerase.
• The SPU BMC DERA was confirmed as catalytically active.

Conclusions:

• The deoxyribose 5-phosphate aldolase (DERA) is proposed as the universal signature enzyme for SPU BMCs.
• Understanding SPU BMCs has implications for fundamental biology and potential biotechnological applications.
• This research provides a foundation for further investigation into SPU BMC function and engineering.