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-2 subunit is not known. Mediates cell adhesion of neurons and astrocytes, and promotes neurite outgrowth. The sodium/potassium-transporting ATPase is composed of a catalytic alpha subunit, an auxiliary non-catalytic beta subunit and an additional regulatory subunit. Interacts with isoform 2 of BSG (PubMed:12558975). The C-terminal lobe folds into an immunoglobulin-like domain and mediates cell adhesion properties. Belongs to the X(+)/potassium ATPases subunit beta family.