This is the non-catalytic component of the active enzyme, which catalyzes the hydrolysis of ATP coupled with the exchange of Na(+) and K(+) ions across the plasma membrane. The exact function of the beta-3 subunit is not known. This is the function of Ensembl gene identifier ENSG00000069849 (ATP1B3, ATPase Na+/K+ transporting subunit beta 3).