HCN: a plausible source of purines, pyrimidines and amino acids on the primitive earth.
Dilute (0.1 M) solutions of HCN condense to oligomers at pH 9.2. Hydrolysis of these oligomers yields 4,5-dihydroxypyrimidine, orotic acid, 5-hydroxyuracil, adenine, 4-aminoimidazole-5-carboxamide and amino acids. These results, together with the earlier data, demonstrate that the three main classes of nitrogen-containing biomolecules, purines, pyrimidines and amino acids may have originated from HCN on the primitive earth. The observation of orotic acid and 4-aminoimidazole-5-carboxyamide suggests that the contemporary biosynthetic pathways for nucleotides may have evolved from the compounds released on hydrolysis of HCN oligomers.
D000596:Amino Acids / Q000138:chemical synthesis*; D006856:Hydrogen Cyanide; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D009963:Orotic Acid; D010100:Oxygen; D011687:Purines / Q000138:chemical synthesis*; D011743:Pyrimidines / Q000138:chemical synthesis*; D014867:Water
D000596:Amino Acids; D011687:Purines; D011743:Pyrimidines; D014867:Water; D006856:Hydrogen Cyanide; D009963:Orotic Acid; D010100:Oxygen