Great Offset Difference Internuclear Selective Transfer

J Phys Chem Lett. 2023 Apr 27;14(16):3939-3945. doi: 10.1021/acs.jpclett.3c00194. Epub 2023 Apr 20.

Abstract

Carbon-carbon dipolar recoupling sequences are frequently used building blocks in routine magic-angle spinning NMR experiments. While broadband homonuclear first-order dipolar recoupling sequences mainly excite intra-residue correlations, selective methods can detect inter-residue transfers and long-range correlations. Here, we present the great offset difference internuclear selective transfer (GODIST) pulse sequence optimized for selective carbonyl or aliphatic recoupling at fast magic-angle spinning, here, 55 kHz. We observe a 3- to 5-fold increase in intensities compared with broadband RFDR recoupling for perdeuterated microcrystalline SH3 and for the membrane protein influenza A M2 in lipid bilayers. In 3D (H)COCO(N)H and (H)CO(CO)NH spectra, inter-residue carbonyl-carbonyl correlations up to about 5 Å are observed in uniformly 13C-labeled proteins.

MeSH terms

  • Carbon / chemistry
  • Lipid Bilayers / chemistry
  • Magnetic Resonance Spectroscopy*

Substances

  • Carbon
  • M2 protein, Influenza A virus
  • Lipid Bilayers