TABLE 1.

Purification of the ATPase of I. tartaricus (starting material, 5 g of wet packed cells)

Step	Protein (mg)	Activity (U)	Sp act (U/mg)	Yield (%)
Triton extraction	53.5	68	1.28	100
Polyethylene glycol fractionation	2.8	47	17	69
Gel filtration	1.3	26	20.7	38