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Abstract
In-cell NMR in the yeast Pichia pastoris was used to study the influence of metabolic changes on protein structure and dynamics at atomic resolution. Induction of ubiquitin overexpression from the methanol induced AOX1 promoter results in the protein being localized in the cytosol and yields a well-resolved in-cell NMR spectrum. When P. pastoris is grown on a mixed carbon source containing both dextrose and methanol, ubiquitin is found in small storage vesicles distributed in the cytosol, and the resulting in-cell NMR spectrum is broadened. The sequestration of overexpressed proteins into storage vesicles, which are inaccessible to small molecules, was demonstrated for two unrelated proteins and two different strains of P. pastoris , suggesting its general nature.
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