Simple Enzymes from Kimchi Bacteria Break Down Plant Fibers

A special bacteria that lives in kimchi was studied to find useful enzymes. Scientists looked at its entire DNA map and found many genes that could split sugars. They chose three of those genes to test in a lab. Two were called LbXyl43A and LbXyl43B, and the third was LbBgl3. These genes were copied into a friendly bacteria called E. coli so the enzymes could be made in large amounts. The two xylosidase enzymes liked to work on a chemical that releases a bright color when cut. They worked best at neutral pH and temperatures of 25 °C for one enzyme and 40 °C for the other.Both could also break down small sugar chains from plant fibers, showing they might help turn wood into useful sugars. The glucosidase enzyme preferred a different bright‑color chemical and worked best at a slightly alkaline pH of 9. 0 and 45 °C. It stayed stable up to that temperature and was very good at cutting cellobiose, a sugar made from cellulose. The researchers checked the enzyme structures and confirmed that each had the right parts for their job, with key active sites in place. This work helps explain how food‑related bacteria can provide enzymes useful for turning plant waste into fuels or foods.