Solubilization and Partial Purification of N,N′-Dicyclohexylcarbodiimide-Sensitive ATPase from Pea Cotyledon Mitochondria

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Abstract
The N,N''-dicyclohexylcarbodiimide (DCCD)-sensitive ATPase of pea (P. sativum L.) cotyledon mitochondria was solubilized from submitochondrial particle membranes with sodium cholate and ammonium sulfate. Ammonium sulfate precipitation of the enzyme resulted in an increase in specific activity. At between 38% and 45% saturated ammonium sulfate, 20% of the ATPase activity was precipitated, with a specific activity 4-5 times higher than that of the crude enzyme. The precipitate was highly sensitive to DCCD. The properties of the ammonium sulfate preparation were investigated. It contained levels of cytochrome and NADH dehydrogenase contamination comparable to those of the highly purified F0F1 preparations from animal tissue. The high degree of purification was corroborated by sodium dodecyl sulfate electrophoresis.