Predicted and Experimental NMR Chemical Shifts at Variable Temperatures: The Effect of Protein Conformational Dynamics.
| Autor: | Yi X; Department of Chemistry, Columbia University, New York, New York 10025, United States., Zhang L; Department of Chemistry, Columbia University, New York, New York 10025, United States., Friesner RA; Department of Chemistry, Columbia University, New York, New York 10025, United States., McDermott A; Department of Chemistry, Columbia University, New York, New York 10025, United States. |
|---|---|
| Jazyk: | angličtina |
| Zdroj: | The journal of physical chemistry letters [J Phys Chem Lett] 2024 Feb 29; Vol. 15 (8), pp. 2270-2278. Date of Electronic Publication: 2024 Feb 21. |
| DOI: | 10.1021/acs.jpclett.3c02589 |
| Abstrakt: | NMR chemical shifts provide a sensitive probe of protein structure and dynamics but remain challenging to predict and interpret. We examine the effect of protein conformational distributions on 15 N chemical shifts for dihydrofolate reductase (DHFR), comparing QM/MM predicted shifts with experimental shifts in solution as well as frozen distributions. Representative snapshots from MD trajectories exhibit variation in predicted 15 N chemical shifts of up to 25 ppm. The average over the fluctuations is in significantly better agreement with room temperature solution experimental values than the prediction for any single optimal conformations. Meanwhile, solid-state NMR (SSNMR) measurements of frozen solutions at 105 K exhibit broad lines whose widths agree well with the widths of distributions of predicted shifts for samples from the trajectory. The backbone torsion angle ψ |
| Databáze: | MEDLINE |
| Externí odkaz: |
|