Relative interatomic distances between the NMR nuclei (H-1 and P-31) and th
e ferric ion of the ATP-Fe-III complex in solution are evaluated by quantit
ative analysis of the relaxation enhancements. The results show that, at pH
3, N-1 of the purine base is the coordination site rather than N-7. (C) 19
99 Elsevier Science Ltd. All rights reserved.