Section 25.1 In de Novo Synthesis, the Pyrimidine Ring Is Assembled from Bicarbonate, Aspartate, and Glutamine In recent years, the basic processes of plant nucleotide de novo synthesis have been analyzed in some detail (Giermann et al., 2002; Moffatt and Ashihara, 2002; Boldt. De novo synthesis refers to the synthesis of complex molecules from simple molecules such as. Purine and pyrimidine Metabolism; De novo synthesis of purine. Nucleotide Metabolism II. Figure 22.1 gives a quick overview of de novo nucleotide biosynthesis. De Novo Synthesis of Pyrimidine Nucleotides. The figure at the side. De Novo Synthesis of Purine Nucleotides -We use for purine nucleotides the entire glycine molecule. HOME;. De Novo Synthesis of Pyrimidine Nucleotides. Purine Synthesis & Pyrimidine Synthesis in Cells Lecture Notes. De-novo & Salvage Pathways. Adenine Synthesis, Guanine Synthesis. Nucleotide Metabolism in cells Pyrimidine biosynthesis occurs both in the body and through organic synthesis. Activation of Ribose-5-Phosphate. Both the salvage and de novo synthesis pathways of purine and pyrimidine biosynthesis lead to production of nucleoside-5'-phosphates. Nucleotide Synthesis De Novo. Pyrimidine synthesis starts with the stepwise formation of the base, to which is then added the ribose‐phosphate. Purine and Pyrimidine Metabolism Topics Overview. De novo synthesis of both purine and pyrimidine nucleotides occurs from readily available components.