Sequential protein NMR assignments in the liquid state via sequential data acquisition.

Area of Science:

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

Background:

• Protein backbone sequential resonance assignments are crucial for determining protein structure and function.
• Traditional NMR methods can be time-consuming, limiting throughput in structural biology.
• Efficient assignment strategies are needed to accelerate the process for uniformly labeled proteins.

Purpose of the Study:

• To present novel NMR pulse schemes for accelerated protein backbone sequential resonance assignments.
• To reduce the overall experimental time required for obtaining sequential assignments.
• To validate the proposed methods using a specific protein domain.

Main Methods:

• Development and application of two distinct 3D NMR pulse schemes involving sequential (1)H data acquisition.
• Utilized {HCCNH and HNCACONH} or {HNCOCANH and HNCACONH} spectra acquisition.
• Employed uniformly (13)C,(15)N labeled proteins for experiments.

Main Results:

• Demonstrated a reduction in overall experimental time by approximately a factor of two compared to individual acquisitions.
• Successfully assigned protein backbone resonances using the sequential acquisition strategy.
• Experimental validation performed on the C-terminal winged helix (WH) domain of the minichromosome maintenance (MCM) complex from Sulfolobus solfataricus.

Conclusions:

• The presented sequential NMR data acquisition strategies offer a significant acceleration of protein backbone resonance assignment.
• These methods provide an efficient alternative for structural studies of proteins, particularly for uniformly labeled samples.
• The approach is experimentally validated and applicable to complex biological systems.