Also known as the tricarboxylic cycle and Krebs’ cycle, organism use this pathway to yield energy via the oxidation of acetate (in the form of acetyl CoA), that is produced as a result of the catabolism of carbohydrates, proteins and fats. The cycle provides several precursory compounds as well as intermediates of other biological reactions.
Reference : Champe, Pamela C. and Richard A. Harvey.1994. Lippincott’s Ilustrated Reviews:Biochemistry. Philadelphia. J.B. Lippincott and Company