Members of this family adopt an alpha-helical conformation under hydrophobic conditions. The domain contains tyrosine residues, phosphorylation of which regulates the function of the ATPase. Additionally, the domain also interacts with various structural proteins, including the spectrin-binding domain of ankyrin III [1].

1: Structure determination and conformational change induced by tyrosine phosphorylation of the N-terminal domain of the alpha-chain of pig gastric H+/K+-ATPase. Fujitani N, Kanagawa M, Aizawa T, Ohkubo T, Kaya S, Demura M, Kawano K, Nishimura S, Taniguchi K, Nitta K; Biochem Biophys Res Commun. 2003;300:223-229. PMID:12480547