1.17.4.1 Ribonucleoside-diphosphate reductases

Ribonucleoside-diphosphate reductases (RNRs) are a family of enzymes that catalyze the conversion of ribonucleotides to deoxyribonucleotides, which are the building blocks of DNA. This reaction is essential for DNA synthesis and repair in all living organisms. RNRs are divided into three classes based on their structure and cofactor requirements: class I, class II, and class III.