This model represents a group of adenosylcobalamin(B12)-dependent ribonucleotide reductases (RNR) related to the characterized species from Lactococcus leichmannii. RNR's are responsible for the conversion of the ribose sugar of RNA into the deoxyribose sugar of DNA. This is the rate-limiting step of DNA biosynthesis. Thus model identifies NrdJ enzymes only in cyanobacteria, lactococcus and certain bacteriophage. A separate model (TIGR02504) identifies a larger group of divergent B12-dependent RNR's. [Purines, pyrimidines, nucleosides, and nucleotides, 2'-Deoxyribonucleotide metabolism]
Jiyao W et al.(2023). "The conserved domain database in 2023.",