fungal-type Na(+)-ATPase, similar to the plasma membrane sodium transporters Saccharomyces cerevisiae Ena1p, Ena2p and Ustilago maydis Ena1, and the endoplasmic reticulum sodium transporter Ustilago maydis Ena2
Fungal-type Na(+)-ATPase (also called ENA ATPases). This subfamily includes the Saccharomyces cerevisiae plasma membrane transporters: Na(+)/Li(+)-exporting ATPase Ena1p which may also extrudes K(+), and Na(+)-exporting P-type ATPase Ena2p. It also includes Ustilago maydis plasma membrane Ena1, an K(+)/Na(+)-ATPase whose chief role is to pump Na(+) and K(+) out of the cytoplasm, especially at high pH values, and endoplasmic reticulum Ena2 ATPase which mediates Na(+) or K(+) fluxes in the ER or in other endomembranes. This subfamily belongs to the P-type ATPases, a large family of integral membrane transporters that are of critical importance in all kingdoms of life. They generate and maintain (electro-) chemical gradients across cellular membranes, by translocating cations, heavy metals and lipids, and are distinguished from other main classes of transport ATPases (F- , V- , and ABC- type) by the formation of a phosphorylated (P-) intermediate state in the catalytic cycle.
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