Tang B, Chong K, Massefski W, Evans R. Quantitative Interpretation of Protein Diffusion Coefficients in Mixed Protiated-Deuteriated Aqueous Solvents.
J Phys Chem B 2022;
126:5887-5895. [PMID:
35917500 PMCID:
PMC9376945 DOI:
10.1021/acs.jpcb.2c03554]
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Abstract
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Diffusion-ordered nuclear magnetic resonance (NMR) spectroscopy
is widely used for the analysis of mixtures, dispersing the signals
of different species in a two-dimensional spectrum according to their
diffusion coefficients. However, interpretation of these diffusion
coefficients is typically purely qualitative, for example, to deduce
which species are bigger or smaller. In studies of proteins in solution,
important questions concern the molecular weight of the proteins,
the presence or absence of aggregation, and the degree of folding.
The Stokes–Einstein Gierer–Wirtz estimation (SEGWE)
method has been previously developed to simplify the complex relationship
between diffusion coefficient and molecular mass, allowing the prediction
of a species’ diffusion coefficient in a pure solvent based
on its molecular weight. Here, we show that SEGWE can be extended
to successfully predict both peptide and protein diffusion coefficients
in mixed protiated–deuteriated water samples and, hence, distinguish
effectively between globular and disordered proteins.
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