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 vital for key physiological functions such as nerve signaling, muscle contraction, and regulation of cell volume. As a beta subunit, ATP1B2 aids in the assembly, stability, and positioning of the pump in the membrane by interacting with its catalytic alpha subunit.