Incorporating the BEST methodology in experiments for measuring paramagnetic relaxation enhancements

Area of Science:

• Biophysical Chemistry
• Nuclear Magnetic Resonance (NMR) Spectroscopy
• Structural Biology

Background:

• Band-selective excitation short-transient (BEST) sequences are crucial for protein NMR, enhancing sensitivity in experiments starting with amide proton magnetization.
• BEST methodology optimizes amide proton longitudinal relaxation, enabling greater sensitivity with shorter scan times.

Purpose of the Study:

• To demonstrate the integration of BEST methodology into sequences for measuring proton transverse relaxation rates (1H R2).
• To evaluate the utility of BEST-based experiments for determining paramagnetic relaxation enhancements (PREs).

Main Methods:

• Incorporation of BEST methodology into standard HSQC and TROSY pulse sequences.
• Development of BEST-HSQC-PRE and BEST-TROSY-PRE experiments for measuring 1H R2 relaxation rates.

Main Results:

• BEST methodology can be effectively applied to measure 1H R2 relaxation rates for PRE determination.
• BEST-HSQC-PRE and BEST-TROSY-PRE experiments show comparable or improved sensitivity for PRE measurements.
• These new experiments provide accurate measurements of transverse relaxation rates and PREs.

Conclusions:

• BEST methodology offers a valuable enhancement for protein NMR experiments measuring PREs.
• The developed BEST-based experiments allow for shorter scan times without compromising data quality or accuracy.
• This advancement facilitates more efficient structural and dynamic studies of proteins using NMR.