Th. B. Fitzpatrick

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A range of substrate-derived chloromethane inhibitors have been synthesized which have one to four amino acid residues. These have been used to inhibit both subtilisin and chymotrypsin. Using 13C NMR, we have shown that all except one of these inhibitors forms a tetrahedral adduct with chymotrypsin, subtilisin, and trypsin. From the pH-dependent changes in(More)
13C-NMR has been used to follow the exchange of the alpha-protons of [2-(13)C]glycine in the presence of pyridoxal-5'-phosphate and the catalytic antibody 15A9. In the presence of antibody 15A9 the 1st order exchange rates for the rapidly exchanged proton of [2-(13)C]glycine were only 25 and 150 times slower than those observed with tryptophan synthase (EC(More)
Several varieties of ocular pathology are associated with acquired cutaneous hypomelanosis (leukoderma; vitiligo). Our current study was undertaken to investigate the relationship between ophthalmologic disorders and a specific depigmentary phenomenon, the vitiligolike leukoderma of cutaneous melanoma. Over the past 14 years, eight patients with cutaneous(More)
L-[1.2-13C2, 15N]Serine was prepared from [1,2-13C2, 15N]glycine on a gram scale by the use of the enzyme serine hydroxymethyltransferase. The reaction was monitored by 13C-NMR spectroscopy. This is the first simultaneously 13C- and 15N-labelled serine isotopomer so far reported. Part of the product was directly converted by tryptophan synthase to(More)
13C-NMR has been used to determine how replacing the histidine-228 residue of serine hydroxymethyltransferase (EC 2.1.2.1) by an asparagine residue effects the catalysis of the hydrogen-deuterium exchange of the alpha-protons of [2-13C]glycine at pH 7.8. The H228N mutation did not lead to a large change in the stereospecificity of the first order exchange(More)