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Synthesis of Pyrimidine Ribonucleotides


Synthesis of the Pyrimidines is less complex than that of the Purines, since the base is much simpler. Synthesis of Carbamoyl-P (Carbamoyl Phosphate) is the first reaction of Pyrimidine biosynthesis. Carbamoyl-P is formed from HCO3- (Bicarbonate) and the amide nitrogen of Glutamine by the cytosolic enzyme CPSase (Carbamoyl Phosphate Synthetase). This reaction consumes two molecules of ATP (Adenosine Monophosphate): One provides a phosphate group and the other energizes the reaction. Then condensation of Carbamoyl-P with Asp (...




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