Sequence, topology, and N-linked glycosites of potassium-transporting ATPase β subunit (ATP4B, 294 residues). ATB4B was predicted as type II membrane protein with residues 1-36 located intracellular (highlighted in yellow), residue 38-57 as transmembrane segment (highlighted with red), and residue 58-294 located extracellular (highlighted with blue). Seven potential N-linked glycosites were predicted in C-terminal region (the Asparagine residues (N) for the N-linked glycosites are highlighted with red. Five of the seven predicted N-linked glycosites were identified in this study (underlined). These experimental evidences also prove the membrane topology with C-terminal tail located in extracellular surface.