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Tyrosine radicals localized in the M2 subunits of ribonucleotide reductase have been detected by electron paramagnetic resonance (EPR) in ordinary ascites tumour cells. The intensity of its doublet EPR spectrum is higher in rapidly proliferating cells. Hydroxyurea, a specific inhibitor of this enzyme, decreases the concentration of the tyrosine radical. Whereas in different ascites tumours the doublet EPR spectrum dominates at g = 2.004, in solid tumours another more intense EPR spectrum from nitrosyl-hemoproteins appears. In conclusion, EPR spectroscopy can be used to monitor the content and variations of active M2 subunits of ribonucleotide reductase in intact ascites tumour cells.
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