Speeding-up exchange-mediated saturation transfer experiments by Fourier transform.
Protein motions over various time scales are crucial for protein function. NMR relaxation dispersion experiments play a key role in explaining these motions. However, the study of slow conformational changes with lowly populated states remained elusive. The recently developed exchange-mediated saturation transfer experiments allow the detection and characterization of such motions, but require extensive measurement time. Here we show that, by making use of Fourier transform, the total acquisition time required to measure an exchange-mediated saturation transfer profile can be reduced by twofold in case that one applies linear prediction. In addition, we demonstrate that the analytical solution for R1ρ experiments can be used for fitting the exchange-mediated saturation transfer profile. Furthermore, we show that simultaneous analysis of exchange-mediated saturation transfer profiles with two different radio-frequency field strengths is required for accurate and precise characterization of the exchange process and the exchanging states.
Department of NMR-based Structural Biology, Max-Planck Institute for Biophysical chemistry, Am Fassberg 11, 37077, Goettingen, Germany.
Marta G
MG
Carneiro
Department of NMR-based Structural Biology, Max-Planck Institute for Biophysical chemistry, Am Fassberg 11, 37077, Goettingen, Germany.
Jithender G
JG
Reddy
Department of NMR-based Structural Biology, Max-Planck Institute for Biophysical chemistry, Am Fassberg 11, 37077, Goettingen, Germany.
Christian
C
Griesinger
Department of NMR-based Structural Biology, Max-Planck Institute for Biophysical chemistry, Am Fassberg 11, 37077, Goettingen, Germany. dole@nmr.mpibpc.mpg.de.|Department of Medicine, James Graham Brown Cancer Center, University of Louisville, 529 South Jackson Street, Louisville, KY, 40202, USA. dole@nmr.mpibpc.mpg.de.
Donghan
D
Lee
D005583:Fourier Analysis; D019906:Nuclear Magnetic Resonance, Biomolecular; D011506:Proteins / Q000737:chemistry*
D011506:Proteins
CEST; Chemical exchange; DEST; Fourier transform; NMR; Protein dynamics