Panel I, 13C NMR spectra of [1′-13C]inosine with native human PNP after (A) 30 min and (B) 24 h.
Panel II, 1H NMR spectra of [1′-13C]inosine with native human PNP after (A) 30 min, (B) 3 h, (C) 6 h, (D) 12 h, and (E) 24 h.
Panel III, 1H NMR spectra of [1′-13C]inosine with F200G after (A) 40 min and (B) 24 h.
All 13C and 1H spectra were acquired with 5.3 mM [1′-13C]inosine and 6 μM PNP in the absence of phosphate at 25 °C in 10% D2O. [1] Ino, inosine; [5] N3-Ino, N3-inosine.