A marine algal Na+-activated ATPase possesses an immunologically identical epitope to Na+,K+-ATPase

AbstractImmunological homology was investigated between Heterosigma akashiwo (a marine alga) Na+-activated ATPase and animal Na+,K+-ATPase. The former polypeptide [(1989) Plant Cell Physiol. 30, 923-928] reacted with anti-serum raised against the amino-terminal half of the pig kidney Na+,K+-ATPase α subunit. It is suggested that the Na+,K+-ATPase epitope within the amino-terminal region is conserved in the plant Na+-activated ATPase, and the region containing the epitope may be important for Na ion transport