Abstract
The chromatophore-bound adenosine triphosphatase and inorganic pyrophosphatase of Rhodospirillum rubrum are inactivated by treatment with phospholipase A. Parallel to the inactivation of these enzymes, the ability of the chromatophores to catalyze photophosphorylation of ADP and the ATP-P i exchange reaction is lost. The loss of the enzymatic activities involved in the energy-conversion system of the chromatophores is due to the removal of phospholipids from the membranes; reconstitution is effected by rebinding of phospholipids. It could be demonstrated that the coupling of electron flow to the synthesis of ATP requires more than an active ATPase.
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