This video tells us about the introduction, structure of ribonucleotide reductase and the mechanism of action of the RR. In the end of video, Regulation mechanism is discussed related to ribonucleotide reductase and regeneration of tetrahydrofolate in the end of the reaction mechanism. TIMELINE: 0:01 Introduction 2:01 Ribonucleotide reductase conversion to NDP 5:01 Structure of Class-1 RR 8:34 Ribonucleotide reductase D2 dimer 10:53 RR mechanism 13:10 Thirodoxin role on RR 16:50 Electron transfer pathways 19:27 Regulation of RR 24:12 Thymidylate synthesis mechanism 26:15 Regeneration of tetrahydrofolate 30:15 End