Tryptophan fluorescence of human phenylalanine hydroxylase produced in Escherichia coli.


Human phenylalanine hydroxylase (hPAH) contains three tryptophan residues (W120, W187, and W326). All three tryptophan residues were mutated to phenylalanine either as single mutants or in combination, and one tryptophan was also mutated to isoleucine. The mutant enzymes were expressed in Escherichia coli and purified as fusion proteins with maltose-binding… (More)


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