title: Sequence comparison of rat liver phenylalanine hydroxylase and its cDNA clones.
abstract: Classical phenylketonuria, an inborn error in metabolism, is caused by a deficiency of the hepatic enzyme phenylalanine hydroxylase. The identification of putative cDNA clones coding for rat liver phenylalanine hydroxylase by hybrid-selected translation has previously been reported [Robson, K. J., Chandra, T., MacGillivray, R. T. A., & Woo, S. L. C. (1982) Proc. Natl. Acad. Sci. U.S.A. 79, 4701-4705]. The authenticity of the clones, however, could not be definitively ascertained at the time because of a lack of amino acid sequence data of the enzyme in the literature. Purified rat liver phenylalanine hydroxylase was subjected to cyanogen bromide treatment, and the resulting fragments were used for N-terminal amino acid sequence analysis. The partial amino acid sequence was then compared to that deduced from an open reading frame in the nucleotide sequence of the cDNA clones. A perfect match of 17 amino acid residues was found between the two sequences following a unique methionine codon present in the nucleotide sequence, thereby providing unambiguous evidence for the identity of the rat liver phenylalanine hydroxylase cDNA clones.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003488:Cyanogen Bromide; D004247:DNA; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant; D008099:Liver / Q000201:enzymology*; D010446:Peptide Fragments; D010651:Phenylalanine Hydroxylase / Q000235:genetics*; D051381:Rats
chemical_list: D004274:DNA, Recombinant; D010446:Peptide Fragments; D004247:DNA; D010651:Phenylalanine Hydroxylase; D004262:DNA Restriction Enzymes; D003488:Cyanogen Bromide