ATP1B2 (Sodium/potassium-transporting ATPase subunit beta-2) is a protein that functions as part of the Na⁺/K⁺-ATPase pump — a crucial enzyme complex responsible for maintaining the balance of sodium and potassium ions across cell membranes. This balance is essential for key physiological processes such as nerve signaling, muscle contraction, and regulation of cell volume. As a beta subunit, ATP1B2 supports the assembly, stability, and membrane localization of the pump through its interaction with the catalytic alpha subunit.