Table 1.

Hyperfine couplings and g-values for deoxyribose radicals^a,b

Compoundc	Hyperfine coupling constants (G)	g-value
C1′•
2′-dG, 5′-D,D-2′-dG, 5′-dGMP	16 (1βH), 32 (1βH)	2.0029
3′-dGMP	15.5 (1βH), 35(1βH)	2.0029
DNA (77 K illumination)	15 (1βH), 37 (1βH)	2.0029
C5•′
2′-dG, 5′-D,D-2′-dG, 3′-dGMP	∼19 (1αH)	2.0025
C3′•
2′-dG, 5′-D,D-2′-dG	∼21 (1βH), 25 (1βH), 42 (1βH)	2.0032
5′-dGMPd	∼20 (1βH), 30 (1βH), 41 (1βH)	2.0032

^aValues are for radicals at 77 K, formed by illumination at 143 K and at native pH (∼5), unless otherwise stated.

^bDNA in frozen aqueous solutions (ice). Other samples in aqueous glasses (7 M LiCl/D₂O).

^cDeuteration at C8 in 2′-dG, its 3′- and 5′-nucleotides and in 5′-D,D-2′-dG has no effect on the values reported here.

^d77 K illumination.