Mannitol-specific phosphotransferase system Enzyme II component (MtlA) (MtlA)

The bacterial mannitol-specific phosphotransferase system (PTS) is a specialized multi-domain protein complex that mediates the coupled transport and phosphorylation of mannitol into the bacterial cell [UniProt, 2024]. It is primarily defined by the Enzyme II (EII) component, specifically MtlA, which integrates a membrane-bound IIC transporter domain with cytoplasmic IIA and IIB phosphoryl-transfer domains [PubMed, 2012]. This system utilizes a high-energy phosphate from phosphoenolpyruvate (PEP) to produce intracellular mannitol-6-phosphate, a key intermediate for glycolysis [Wikipedia, 2023]. In addition to its transport function, the mannitol PTS plays a critical role in signal transduction, particularly in carbon catabolite repression, which allows bacteria to prioritize carbon sources and regulate virulence factors [PubMed, 2004]. As the PTS is entirely absent in humans, it represents an attractive target for the development of novel antimicrobial agents that could provide high selectivity [PubMed, 2005]. Targeting this system with experimental inhibitors, such as mannitol analogs, can effectively starve the pathogen and disrupt its metabolic flexibility, offering a potential pathway to treat resistant bacterial infections.

Other names

Enzyme II mannitolMannitol-specific PTSMannitol permeaseEIIMtlBacterial mannitol-specific phosphotransferase system

Inhibition of mannitol uptake and phosphorylation, leading to carbon starvation and disruption of catabolite repression-mediated gene regulation [PubMed, 2005].