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Plant Physiol. 1982 Nov;70(5):1260-4. doi: 10.1104/pp.70.5.1260.

Phosphatidylglycerol synthesis in spinach chloroplasts: characterization of the newly synthesized molecule.

Plant physiology

S A Sparace, J B Mudd

Affiliations

  1. Department of Biochemistry and Statewide Air Pollution Research Center, University of California, Riverside, California 92521.

PMID: 16662664 PMCID: PMC1065872 DOI: 10.1104/pp.70.5.1260

Abstract

Intact chloroplasts from spinach (Spinacia oleracea L., hybrid 424) readily incorporate [(14)C]glycerol-3-phosphate and [(14)C]acetate into diacylglycerol, monoacylglycerol, diacylglycrol, free fatty acids (only when acetate is the precursor), phosphatidic acid, phosphatidylcholine, and most notably phosphatidylglycerol. The fraction of phosphatidylglycerol synthesized is greatly increased by the presence of manganese chloride in the reaction mixture. Glycerol-3-phosphate-labeled phosphatidylglycerol is equally labeled in the two glycerol moieties of the molecule. Acetate-labeled phosphatidylglycerol is equally labeled in both acyl groups. Position one contains primarily oleate, linoleate and small amounts of palmitate. Position two contains primarily palmitate. No radioactive trans-Delta(3)-hexadecenoate was detected. The labeling patterns indicate that the radioactive phosphatidylglycerol is the product of de novo chloroplast lipid biosynthesis and furthermore, phosphatidylglycerol may be a substrate for fatty acid desaturation.

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