Abstract
Deoxyribonucleotides have their own specific biochemistry which, although overlooked occasionally, is essential for understanding the DNA synthesis (S) phase of a cell. The unusual complexity of the only pathway leading to DNA precursors, enzymatic reduction of ribonucleotides, is exemplified in studies with synchronously growing green algae (Scenedesmus obliquus). The process involves flexible nucleotide-protein interactions, dithiols as reductant, transition metals (Mn, Fe, Co) for catalysis, and radical intermediates. Chemical and biochemical evidence suggests that the origin of DNA is inseparably connected with the evolution of such a catalytic process.
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