Also known as NRDG_PASMU, nrdG. Activation of anaerobic ribonucleoside-triphosphate reductase under anaerobic conditions by generation of an organic free radical, using S-adenosylmethionine and reduced flavodoxin as cosubstrates to produce 5'-deoxy-adenosine. Forms a tetramer composed of two NrdD and two NrdG subunits.
