The translocation of adenine nucleotides across the inner mitochondrial membrane and the tissue concentration of long-chain acyl-CoA esters were studied in dog heart after experimental myocardial ischemia. Ligation of the anterior coronary artery initiated events leading to an early decrease in adenine nucleotide translocase activity. A reciprocal increase in the concentration of heart tissue l...

Rhodnius prolixus is an obligatory hematophagous insect, vector of Chagas disease. After blood meal, lipids are absorbed, metabolized, synthesized, and accumulated in the fat body. When necessary, stored mobilized, transported to other organs, or oxidized provide energy. Mitochondrial ?-oxidation a cyclic conserved pathway, where degradation long-chain fatty acids occurs contribute cellular ene...

Long chain fatty acid biosynthesis proceeds through a condensation between acetyl coenzyme A and malonyl coenzyme A (1,2) as has now been shown in fatty acid synthetase systems from animal (3), plant (4), and microbial (5-7, Sl) sources. With studies on extracts of Escherichia coli, in which the major product is vaccenic acid, Lennarz, Light, and Bloch (7) have shown and we have confirmed (8) t...

The de novo synthesis of fatty acids occurs in two distinct cellular compartments. Palmitate (16:0) is synthesized from acetyl-CoA and malonyl-CoA in the cytoplasm by the enzymes acetyl-CoA carboxylase 1 and fatty acid synthase. The synthesis of fatty acids longer than 16 carbons takes place in microsomes and utilizes malonyl-CoA as the carbon source. Each two-carbon addition requires four sequ...