Three-dimensional structure of the free radical protein of ribonucleotide reductase

@article{Nordlund1990ThreedimensionalSO,
  title={Three-dimensional structure of the free radical protein of ribonucleotide reductase},
  author={P. Nordlund and B. Sj{\"o}berg and H. Eklund},
  journal={Nature},
  year={1990},
  volume={345},
  pages={593-598}
}
The enzyme ribonucleotide reductase furnishes precursors for the DNA synthesis of all living cells. One of its constituents, the free radical protein, has an unusual α-helical structure. There are two iron centres that are about 25 Å apart in the dimeric molecule. Tyrosine 122, which harbours the stable free radical necessary for the activity of ribonucleotide reductase, is buried inside the protein and is located 5 Å from the closest iron atom. 
Structure of ribonucleotide reductase protein R1
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From RNA to DNA, why so many ribonucleotide reductases?
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