Two modifications to sensitivity-enhanced gradient-selected TROSY-based tri
ple-resonance NMR experiments are proposed that reduce the overall duration
of the pulse sequences and minimize radiation damping effects on water-fli
pback solvent suppression. The modifications are illustrated for the HNCO-T
ROSY experiment, but are applicable to all triple-resonance experiments tha
t detect proton magnetization after a reverse polarization transfer step fr
om a N-15 spin. The methods are applied to yeast triosephosphate isomerase,
a symmetric dimer with 248 amino acid residues per monomer, (C) 1999 Acade
mic Press.