Fructose phosphotransferase system (Fru-PTS)

The Fructose phosphotransferase system (Fru-PTS) is a complex bacterial transport system that facilitates the simultaneous translocation and phosphorylation of fructose across the cytoplasmic membrane. It functions as part of the larger phosphoenolpyruvate (PEP)-dependent sugar phosphotransferase system, utilizing PEP as a high-energy phosphate donor to convert fructose into fructose-1-phosphate during transport (UniProt, 2023). This system typically consists of general components like Enzyme I and HPr, alongside the fructose-specific Enzyme II (EII) complex, which provides the substrate specificity (PubMed, PMID: 15659676). Beyond its role in nutrient acquisition, the Fru-PTS is a critical regulator of bacterial physiology, influencing carbon catabolite repression and the expression of virulence factors in various pathogens (Microbiology Spectrum, 2015). Because the PTS is unique to bacteria and absent in humans, it is considered a promising target for the development of narrow-spectrum antimicrobial agents (PubMed, PMID: 22493367). Inhibiting this system can impair bacterial growth and reduce the fitness of pathogens like Streptococcus mutans in the oral cavity or enteric pathogens in the gut (Journal of Bacteriology, 2010). Current therapeutic strategies involve the use of PEP analogs or small molecules that disrupt the phosphorelay or the transport channel itself.

Other names

Fructose-specific phosphotransferase systemEnzyme II fructosePEP-dependent fructose phosphotransferase systemPTS fructose-specific EIIABC componentFru-PTS

Inhibition of the phosphoenolpyruvate-dependent transport and phosphorylation of fructose, disrupting bacterial energy metabolism and signal transduction.