After borohydride reduction, carboxymethylation, and tryptic digestion of the holoenzyme of pig heart alanine aminotransferase, a single icosapeptide containing the N6-(phosphopyridoxyl)lysine residue was isolated by a combination of gel filtration and ion-exchange chromatogrpahy. Its primary structure was determined as Gln-Glu-Leu-Ala-Ser-Phe-His-Ser-Val-Ser-Lsy(Pxy)-Gly-Phe-Met-Gly-Glu-Cys-Gly-Phe-Arg.
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Tanase et al. (1979) studied this question.
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