Editorial Correction

Abstract

Due to a printing error, several lines were incorrectly placed in the Summary to the Bradbeer and Stumpf article, page 214 of the April, 1960, issue of the Journal. The entire Summary is therefore reprinted correctly below:SUMMARYA phosphatidic acid is the major lipid to become labeled when Pi32 (inorganic orthophosphate labeled with P32), under conditions of oxidative phosphorylation, or ATP32 is fed to mitochondria from the cotyledons of germinating peanut, seedlings. With ATP32 as the source of P32, the only cofactor required was Mg++. The stimulation of phosphatidic acid synthesis by an α,β-diglycerideprovided support for the view that this synthesis is due to diglyceride phosphokinase activity in the mitochondria. Evidence is also presented that this enzyme preparation is capable of phosphorylating α-monoglycerideswith the formation of monoacyl phosphatidic acids. When Pi32 was added to slices of peanut cotyledons, the phosphatidylcholine and phosphatidylethanolamine in the mitochondria obtained a much higher level of radioactivity than that observed in experiments with the isolated mitochondria.