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Fatty acid metabolism coordinated metabolic pathways

Citric acid a key metabolic intermediate in the tricarboxylic acid cycle. Its concentration also coordinates several other metabolic pathways. Sufficiently high concentrations of C.a. allosterically activate acetyl-CoA carboxylase (EC 6.4.1.2), the key enzyme in fatty acid biosynthesis. C. a. is a negative allosteric effector of 6-phosphofructokinase (EC 2.7.1.11), the key enzyme of glycolysis. C. a. forms complexes with various cations, particularly iron and calcium. In animals, dietary C. a. improves the utilization of dietary calcium. In bacteria, C. a. can be hydrolysed by ATP citrate lyase (EC 4.1.3.8) and citrate pro-(35)-lyase (EC 4.1.3.6) (Fig.). [Pg.123]

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