Читать книгу Plant Nucleotide Metabolism - Hiroshi Ashihara - Страница 35

This chapter focuses on (i) an outline of the formation of purine, pyrimidine, and pyridine ribonucleoside monophosphates from small molecular weight precursors, the initial metabolites of de novo nucleotide biosynthesis, (ii) conversion of these initial metabolites to nucleoside di- and triphosphates, and (iii) synthesis of deoxyribonucleotides from ribonucleotides. The biosynthesis of purine, pyrimidine, and pyridine monophosphate utilizes three distinct pathways. The individual pathways are presented in more detail in Part II (purine), Part III (pyrimidine), and Part VI (pyridine). In contrast, pathways ii and iii both involve common interconversions of purine and pyrimidine nucleotides, and are therefore, described in this chapter.