Recombinant Staphylococcus haemolyticus Na (+)/H (+) antiporter subunit G1 (mnhG1)
Description
Function of Na(+)/H(+) Antiporters
Na(+)/H(+) antiporters are membrane-bound proteins that facilitate the exchange of sodium ions (Na+) for hydrogen ions (H+) across cell membranes. This process is essential for maintaining the intracellular pH and osmotic balance, particularly in bacteria facing environmental stressors like high salinity or alkalinity . The antiporter activity consumes a transmembrane electrical potential, which is generated by the proton motive force (PMF) .
Structure and Mechanism
While specific structural details of mnhG1 are not readily available, Na(+)/H(+) antiporters generally consist of multiple subunits that form a complex embedded in the cell membrane. These complexes are hydrophobic and membrane-bound, facilitating the transport of ions across the lipid bilayer . The mechanism involves the exchange of Na+ ions for H+ ions, which helps maintain the cytoplasmic pH and prevents excessive sodium accumulation that could disrupt cellular functions.
Research Findings and Implications
Research on Na(+)/H(+) antiporters in related species like Staphylococcus aureus highlights their critical roles in salt tolerance and pathogenesis . For instance, the Mnh1 and Mnh2 antiporters in S. aureus have distinct pH optima and substrate specificities, contributing to the bacterium's survival under different stress conditions . While similar studies on mnhG1 from Staphylococcus haemolyticus are not detailed in the available literature, it is reasonable to infer that mnhG1 plays a similar role in maintaining cellular homeostasis and potentially influencing the bacterium's virulence and survival capabilities.
Data Tables and Comparative Analysis
Given the lack of specific data on mnhG1, a comparative analysis with related antiporters can provide insights into their functional characteristics. The following table summarizes the properties of Mnh1 and Mnh2 antiporters from Staphylococcus aureus, which might serve as a reference for understanding the potential roles of mnhG1:
| Antiporter | Substrate | Optimal pH | Antiport Activity |
|---|---|---|---|
| Mnh1 | Na+ | 7.5 | 21 ± 1% |
| Mnh2 | Na+ | 9.0 | 36 ± 1% |
| Mnh2 | K+ | 9.0 | 39 ± 1% |
Table 1: Catalytic Properties of Mnh1 and Mnh2 Antiporters in Staphylococcus aureus .
Product Specs
Note: While we prioritize shipping the format currently in stock, please specify your format preference in order notes for customized fulfillment.
Note: Standard shipping includes blue ice packs. Dry ice shipping requires advance notice and incurs additional charges.
The tag type is determined during production. If you require a specific tag, please inform us; we will prioritize its development.
Target Background
KEGG: sha:SH2005
STRING: 279808.SH2005
