Читать книгу Plant Nucleotide Metabolism - Hiroshi Ashihara - Страница 19

Uracil (30), cytosine (31), and thymine (32) are the common nucleobases of nucleic acids. DNA and RNA also contain other bases that have been modified after formation of the nucleic acid chain. In the case of DNA, the most common modified base is 5-methylcytosine (33).

Orotate (pyrimidine carboxylic acid) (34) is an intermediate of the de novo pyrimidine biosynthesis. A number of secondary products, such as 5-aminouracil (35), lathyrine (36), and willardine (37) occur in plants (see Part VIII). Dihydrouracil (38) is an intermediate of uracil catabolism (see Part III).