Phosphoglycerate kinase was fluorine‐labelled in the yeast Saccharomyces cerevisiae by inducing enzyme synthesis in the presence of 5‐fluorotryptophan. 19 F NMR measurements on the intact cells showed two resonances from the two tryptophan residues in the protein. The chemical shifts of these resonances were sensitive to the metabolic status of the cells.
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Brindle et al. (1989) studied this question.
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