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