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Conformation-selective detection of residues in solid proteins under magic-angle-spinning.

Pragyan P Parida1, Pravin P Taware1,2, Kaustubh R Mote3

  • 1Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally Village, Serlingampally Mandal, Rangareddy District, Hyderabad, 500046, India.

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Summary

This study introduces a new rotational-echo double resonance (REDOR) pulse sequence to differentiate protein structures. The method distinguishes alpha-helical and beta-sheet regions using conformation-dependent nuclear distances.

Keywords:
[Formula: see text]-REDORAssignmentsMagic-angle-spinning solid-state NMRSecondary structure

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Protein structure determination
  • Biophysical chemistry

Background:

  • Distinguishing secondary structures (alpha-helices and beta-sheets) in proteins is crucial for understanding their function.
  • Magic-angle-spinning (MAS) NMR is a powerful technique for studying solid proteins.
  • Conformation-dependent distances between nuclei can provide structural information.

Purpose of the Study:

  • To develop a novel pulse sequence for differentiating protein secondary structures.
  • To leverage conformation-dependent nuclear distances for structural analysis.
  • To provide a method for simplifying chemical-shift assignments in known protein structures.

Main Methods:

  • Utilized a rotational-echo double resonance (REDOR) pulse sequence.
  • Exploited differences in distances between amide proton (¹H) and nitrogen (¹⁵N) nuclei.
  • Employed a ¹⁵N-REDOR sequence to measure dephasing from remote ¹⁵N nuclei.
  • Applied the method to a uniformly ¹³C, ¹⁵N labeled model protein (GB1) under fast magic-angle-spinning (MAS).

Main Results:

  • Successfully demonstrated a REDOR-based pulse sequence capable of distinguishing secondary structure elements.
  • The method differentiates resonances based on the ψ-torsion angle, correlating with secondary structure.
  • Experiments on protein GB1 validated the sequence's effectiveness at a 41.67 kHz MAS frequency.

Conclusions:

  • The developed REDOR pulse sequence effectively distinguishes alpha-helical and beta-sheet regions in solid proteins.
  • This technique offers a valuable tool for simplifying chemical-shift assignments in proteins with known structures.
  • Anticipated direct application in determining protein secondary structures without reliance on ¹³C chemical shifts.