Expanding the horizons for structural analysis of fully protonated protein assemblies by NMR spectroscopy at MAS frequencies above 100*kHz.
 

Expanding the horizons for structural analysis of fully protonated protein assemblies by NMR spectroscopy at MAS frequencies above 100*kHz.

Related Articles Expanding the horizons for structural analysis of fully protonated protein assemblies by NMR spectroscopy at MAS frequencies above 100*kHz.

Solid State Nucl Magn Reson. 2017 Jul 03;:

Authors: Struppe J, Quinn CM, Lu M, Wang M, Hou G, Lu X, Kraus J, Andreas LB, Stanek J, Lalli D, Lesage A, Pintacuda G, Maas W, Gronenborn AM, Polenova T

Abstract
The recent breakthroughs in NMR probe technologies resulted in the development of MAS NMR probes with rotation frequencies exceeding 100*kHz. Herein, we explore dramatic increases in sensitivity and resolution observed at MAS frequencies of 110-111*kHz in a novel 0.7*mm HCND probe that enable structural analysis of fully protonated biological systems. Proton- detected 2D and 3D correlation spectroscopy under such conditions requires only 0.1-0.5*mg of sample and a fraction of time compared to conventional (13)C-detected experiments. We discuss the performance of several proton- and heteronuclear- ((13)C-,(15)N-) based correlation experiments in terms of sensitivity and resolution, using a model microcrystalline fMLF tripeptide. We demonstrate the applications of ultrafast MAS to a large, fully protonated protein assembly of the 231-residue HIV-1 CA capsid protein. Resonance assignments of protons and heteronuclei, as well as (1)H-(15)N dipolar and (1)H(N) CSA tensors are readily obtained from the high sensitivity and resolution proton-detected 3D experiments. The approach demonstrated here is expected to enable the determination of atomic-resolution structures of large protein assemblies, inaccessible by current methodologies.


PMID: 28732673 [PubMed - as supplied by publisher]



More...