Ribonucleoside-diphosphate reductase subunit M2 B (RRM2B)

Plays a pivotal role in cell survival by fixing damaged DNA at a p53/TP53-dependent method. Supplies deoxyribonucleotides for DNA repair in cells arrested at G1 or G2.

Includes an iron-tyrosyl free radical center needed for catalysis. Types an active ribonucleotide reductase (RNR) complicated with RRM1 which is expressed both in resting and proliferating cells in response to DNA damage.