Summary
Pulsed field gradients were incorporated into the HCACO experiment for acquiring spectra on isotopically enriched protein samples dissolved in H2O. Excellent water suppression and spectral quality were achieved using the modified pulse sequence (gd-HCACO), as demonstrated for a 13C-/15N-labeled sample of the SH2 domain from the hematopoietic cellular kinase dissolved in 90% H2O/10% D2O. Strong correlations for all residues were observed in the gd-HCACO spectrum, even for residues having α-protons resonating exactly at the H2O frequency. The HCACO-TOCSY experiment was modified to correlate intraresidue 13Cα (rather than 1Hα), carbonyl (13C′), and aliphatic side-chain protons [(H)CACO-TOCSY]. Pulsed field gradients were also incorporated into the (H)CACO-TOCSY experiment for water suppression.
References
GrzesiekS. and BaxA. (1992) J. Am. Chem. Soc., 114, 6291–6293.
GrzesiekS. and BaxA. (1993) J. Magn. Reson. Ser. B, 102, 103–106.
IkuraM., KayL.E. and BaxA. (1990) Biochemistry, 29, 4659–4667.
KayL.E., IkuraM., TschudinR. and BaxA. (1990) J. Magn. Reson., 89, 496–514.
KayL.E., IkuraM., GreyA.A. and MuhandiramD.R. (1992) J. Magn. Reson., 99, 652–659.
KayL.E. (1993) J. Am. Chem. Soc., 115, 2055–2057.
KayL.E., XuG.Y., SingerA.U., MuhandiramD.R. and Forman-KayJ.D. (1993) J. Magn. Reson. Ser. B, 101, 333–337.
MarionD., IkuraM., TschudinR. and BaxA. (1989) J. Magn. Reson., 85, 393–399.
MesserleB.A., WiderG., OttingG., WeberC. and WüthrichK. (1989) J. Magn. Reson., 85, 608–613.
MuhandiramD.R., FarrowN.A., XuG.Y., SmallcombeS.H. and KayL.E. (1993) J. Magn. Reson. Ser. B, 102, 317–321.
PattS.L. (1992) J. Magn. Reson., 96, 94–102.
PowersR., GronenbornA.M., CloreG.M. and BaxA. (1991) J. Magn. Reson., 94, 209–213.
QuintrellN., LeboR., VarmusH., BishopJ.M., PettenatiM.J., LeBeauM.M., DiazM.O. and RowleyJ.D. (1987) Mol. Cell. Biol., 7, 2267–2275.
ShakaA.J., KeelerJ., FrenkielT. and FreemanR. (1983) J. Magn. Reson., 52, 335–338.
ShakaA.J., BarkerP.B. and FreemanR. (1985) J. Magn. Reson., 64, 547–552.
ShakaA.J., LeeC.J. and PinesA. (1988) J. Magn. Reson., 77, 274–293.
WiderG. and WüthrichK. (1993) J. Magn. Reson. Ser. B, 102, 239–241.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhang, W., Gmeiner, W.H. Improved 3D gd-HCACO and gd-(H)CACO-TOCSY experiments for isotopically enriched proteins dissolved in H2O. J Biomol NMR 7, 247–250 (1996). https://doi.org/10.1007/BF00202041
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00202041