Rapid NMR assignments of intrinsically disordered proteins using two-dimensional ¹³C-detection based experiments

Area of Science:

• Structural Biology
• Biophysics
• Nuclear Magnetic Resonance Spectroscopy

Background:

• Protein structure determination is crucial for understanding function.
• Traditional backbone resonance assignment methods can be time-consuming.
• Analyzing proteins with low stability or in complex states poses challenges.

Purpose of the Study:

• To develop a rapid and efficient method for protein backbone resonance assignments.
• To enable structural studies of challenging protein targets.
• To improve the speed and accessibility of NMR-based protein analysis.

Main Methods:

• Utilized two-dimensional (2D) Nuclear Magnetic Resonance (NMR) experiments.
• Incorporated high-resolution Carbon-13 alpha (13Cα)-detected NMR experiments.
• Employed selective amino acid residue unlabeling in combination with uniformly labeled samples.

Main Results:

• Successfully assigned protein backbone resonances using a minimal set of two 2D NMR experiments.
• Demonstrated the method's efficacy on a 14.5 kDa human α-synuclein sample during aggregation.
• Showcased applicability to deuterated proteins and those with low stability.

Conclusions:

• The presented NMR approach significantly accelerates backbone resonance assignments.
• This method is particularly valuable for intrinsically disordered proteins and aggregation studies.
• The technique offers a powerful tool for structural biologists studying dynamic or unstable protein systems.