Fructo-oligosaccharide ATP-dependent transport system (Lactobacillus paracasei F19) (FOS ABC transporter)

The Fructo-oligosaccharide (FOS) ATP-dependent transport system in Lactobacillus paracasei F19 is a specialized membrane-bound protein complex belonging to the ATP-binding cassette (ABC) transporter family (Wels et al., 2011, Journal of Bacteriology). Its primary biological function is the high-affinity uptake of prebiotic fructans, such as FOS, from the intestinal environment into the bacterial cytoplasm (Makras et al., 2005, Applied and Environmental Microbiology). This transport system is a critical component of the synbiotic relationship between L. paracasei F19 and FOS, as it allows the probiotic to outcompete other gut microbiota for these specific energy sources (Goh & Klaenhammer, 2015, Annual Review of Food Science and Technology). Once internalized, the FOS is fermented into lactic acid and short-chain fatty acids (SCFAs), which lower intestinal pH and inhibit the growth of pathogens (Crittenden et al., 2001, Journal of Applied Microbiology). Clinically, this system is targeted through the administration of FOS to enhance the survival and therapeutic efficacy of the F19 strain in treating conditions like dysbiosis and irritable bowel syndrome. The interaction between the transporter and its prebiotic substrates is essential for the health-promoting effects associated with this specific probiotic strain.

Other names

FOS transporterMsm-like ABC transporterOligosaccharide transport systemFructan transporterLacticaseibacillus paracasei F19 FOS transporter

The system facilitates the active transport of fructo-oligosaccharides into the bacterial cell using energy derived from ATP hydrolysis, allowing for subsequent fermentation and production of beneficial metabolites.