The solution structure of abxF, an enzyme catalyzing the formation of chiral spiroketal of an antibiotics, (-)-ABX

1.25 mM [U-13C; U-15N] abxF, 5 % v/v [U-100% 2H] D2O, 95 % v/v H2O,
50 mM sodium chloride, 20 mM sodium phosphate, 3 mM sodium azide,
5 mM DTT, 95% H2O/5% D2O

1.71 mM [U-100% 15N] abxF, 5 % v/v [U-100% 2H] D2O, 95 % v/v H2O,
50 mM sodium chloride, 20 mM sodium phosphate, 3 mM sodium azide,
5 mM DTT, 95% H2O/5% D2O