Simultaneous recording of intra-and inter-residue linking experiments for backbone assignments in proteins at MAS frequencies higher than 60 kHz

K Sharma, PK Madhu, V Agarwal, KR Mote - Journal of Biomolecular NMR, 2020 - Springer
Journal of Biomolecular NMR, 2020Springer
Obtaining site-specific assignments for the NMR spectra of proteins in the solid state is a
significant bottleneck in deciphering their biophysics. This is primarily due to the time-
intensive nature of the experiments. Additionally, the low resolution in the^ 1 H 1 H-
dimension requires multiple complementary experiments to be recorded to lift degeneracies
in assignments. We present here an approach, gleaned from the techniques used in multiple-
acquisition experiments, which allows the recording of forward and backward residue …
Abstract
Obtaining site-specific assignments for the NMR spectra of proteins in the solid state is a significant bottleneck in deciphering their biophysics. This is primarily due to the time-intensive nature of the experiments. Additionally, the low resolution in the -dimension requires multiple complementary experiments to be recorded to lift degeneracies in assignments. We present here an approach, gleaned from the techniques used in multiple-acquisition experiments, which allows the recording of forward and backward residue-linking experiments in a single experimental block. Spectra from six additional pathways are also recovered from the same experimental block, without increasing the probe duty cycle. These experiments give intra- and inter residue connectivities for the backbone , , and resonances and should alone be sufficient to assign these nuclei in proteins at MAS frequencies > 60 kHz. The validity of this approach is tested with experiments on a standard tripeptide N-formyl methionyl-leucine-phenylalanine (f-MLF) at a MAS frequency of 62.5 kHz, which is also used as a test-case for determining the sensitivity of each of the experiments. We expect this approach to have an immediate impact on the way assignments are obtained at MAS frequencies .
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