Phosphotransferase System Regulation in Bacterial Signaling

The bacterial phosphotransferase system (PTS) functions not only in sugar uptake but also as a central regulatory hub coordinating carbon and nitrogen metabolism, stress responses and pathogenic traits. In the nitrogen-related branch (PTSNtr), sequential transfers of phosphoryl groups among Enzyme I (EINtr), the phosphocarrier NPr and the regulatory protein EIIANtr integrate signals from nutrient availability to modulate enzyme activities, transcriptional programmes and transport processes. Parallel two-component modules, such as KdpD/KdpE, sense ionic strength and potassium levels, directly adjusting gene expression of high-affinity K+ transporters. Recently characterised phosphohistidine phosphatases provide an enzymatic route for dephosphorylation within the PTSNtr, adding a further layer of control. Together, these circuits enable bacteria to fine-tune metabolic fluxes, adapt to environmental stresses and, in pathogenic species, link metabolic cues to virulence, making PTS regulation a promising target for antimicrobial strategies and biotechnological applications.

Research from Nature Portfolio

Recent studies have elucidated the dual regulatory role of EIIANtr in Salmonella Typhimurium. One investigation demonstrated that EIIANtr binds the key enzyme GlmS in a phosphorylation-state-dependent manner, directly inhibiting its activity to fine-tune amino sugar synthesis required for peptidoglycan and lipopolysaccharide assembly. Dephosphorylation of EIIANtr under nitrogen sufficiency triggers its proteolytic turnover, linking nitrogen status to cell wall precursor homeostasis. A complementary study revealed that EIIANtr also governs the catabolism of 1,2-propanediol and propionate. By stabilising the Salmonella virulence regulator HilD in response to these substrates, EIIANtr establishes a positive feedback loop that couples metabolic inputs to invasion gene expression, illustrating how PTSNtr bridges central metabolism and pathogenicity.

Phosphotransferase System Regulation in Bacterial Signaling publication trend

The graph below shows the total number of articles in phosphotransferase system regulation in bacterial signaling across all publications each year (not limited to Nature Index journals).

Technical terms

Phosphotransferase system (PTS): A bacterial multiprotein pathway that transports and phosphorylates substrates or regulatory proteins via sequential transfer of a phosphate from phosphoenolpyruvate.

PTSNtr: The nitrogen-related PTS branch comprising EINtr, NPr and EIIANtr, which controls nitrogen metabolism and broader cellular functions rather than carbohydrate uptake.

Enzyme I (EI/EINtr): The phosphoenolpyruvate-dependent kinase that initiates PTS phosphorylation cascades by transferring a phosphoryl group to HPr or NPr.

HPr/NPr: Phosphocarrier proteins that relay phosphoryl groups from EI to substrate-specific or regulatory EIIA proteins.

Enzyme IIA (EIIA): A PTS component receiving a phosphoryl group from HPr or NPr and either promoting sugar transport or regulating target enzymes and gene expression.

Two-component system (TCS): A signal transduction pair in which a sensor histidine kinase autophosphorylates in response to a stimulus and transfers the phosphate to a response regulator, altering cellular responses.

References

1. Regulation of Inducible Potassium Transporter KdpFABC by the KdpD/KdpE Two-Component System in Mycobacterium smegmatis. Frontiers in Microbiology (2017).
2. Fine-tuning of amino sugar homeostasis by EIIANtr in Salmonella Typhimurium. Scientific Reports (2016).
3. Enzyme IIANtr Regulates Salmonella Invasion Via 1,2-Propanediol And Propionate Catabolism. Scientific Reports (2017).
4. The Phosphohistidine Phosphatase SixA Targets a Phosphotransferase System. mBio (2018).
5. Regulation of potassium dependent ATPase (kdp) operon of Deinococcus radiodurans. PLOS ONE (2017).
6. Domain swapping reveals that the N-terminal domain of the sensor kinase KdpD in Escherichia coliis important for signaling. BMC Microbiology (2009).