Large-Scale Purification of Na,K-ATPase and Its Protein Subunits from Lamb Kidney Medulla

Abstract
Procedures are described for the large-scale isolation of purified Na,K-ATPase (EC 3.6.1.3) from frozen lamb kidney outer medulla and for the separation of its two protein subunits by hy-droxyapatite chromatography in sodium dodecyl sulfate (SDS). The methods described permit the routine isolation of up to 800 mg of purified Na,K-ATPase in one week, which can subsequently be separated into 500 mg of Mr= 95,000 catalytic subunit and 200 mg of glycoprotein with four SDS-hydroxyapatite column runs.