Separation of rat liver lysosome membrane adenosine triphosphatase activities by polyacrylamide gel electrophoresis

Solubilization of rat liver lysosome membranes with octyl glucoside or lauryl sarcosinate and analysis of ATPase activities in sections of polyacrylamide gels after electrophoresis revealed one major peak at pH 8 and two peaks at pH 5. The pH 8 ATPase peak was not localized in the same peak with pH 5 ATPase activity, suggesting that these were catalyzed by different proteins. Ca2+- and Mg2+-ATPase activities at pH 8 were present in the same major peak, with Ca2+ activity predominating. The pH 8 Ca2+-ATPase was also not present in the same area of the gels as Ca2+-ADPase.