Is protein deuteration beneficial for proton detected solid-state NMR at and above 100 kHz magic-angle spinning?

Diane Cala - de Paepe (1) , Jan Stanek (1) , Kristaps Jaudzems (1) , Kaspars Tars (2) , Loren B Andreas (1, 3) , Guido Pintacuda (1)

1 Biological Solid-State NMR Methods - Méthodes de RMN à l'état solide en biologie
2 Biomed Res & Study Ctr
3 MPI-BPC - Max Planck Institute for Biophysical Chemistry

1H-detection in solid-state NMR of proteins has been traditionally combined with deuteration for both resolution and sensitivity reasons, with the optimal level of proton dilution being dependent on MAS rate. Here we present 1H-detected 15N and 13C CP-HSQC spectra on two microcrystalline samples acquired at 60 and 111 kHz MAS and at ultra-high field. We critically compare the benefits of three labeling schemes yielding different levels of proton content in terms of resolution, coherence lifetimes and feasibility of scalar-based 2D correlations under these experimental conditions. We observe unexpectedly high resolution and sensitivity of aromatic resonances in 2D 13C-1H correlation spectra of protonated samples. Ultrafast MAS reduces or even removes the necessity of 1H dilution for high-resolution 1H-detection in biomolecular solid-state NMR. It yields 15N,1H and 13C,1H fingerprint spectra of exceptional resolution for fully protonated samples, with notably superior 1H and 13C lineshapes for side-chain resonances.

Mots clés: Fractional deuteration; Full protonation; Protein assemblies; Proteins; Proton detection; Resolution; Sensitivity; Side-chains; Solid-state nuclear magnetic resonance; Fast magic-angle spinning

Domaines: Chimie analytique; Biochimie [q-bio.BM]

Diane Cala - de Paepe, Jan Stanek, Kristaps Jaudzems, Kaspars Tars, Loren B Andreas, et al.. Is protein deuteration beneficial for proton detected solid-state NMR at and above 100 kHz magic-angle spinning?. Solid State Nuclear Magnetic Resonance, 2017, 87, pp.126-136. ⟨10.1016/j.ssnmr.2017.07.004⟩. ⟨hal-01575517⟩