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- W1489717679 abstract "6-Pyruvoyl-tetrahydropterin synthase, which catalyzes the second step in the biosynthesis of tetrahydrobiopterin, was purified approximately 18,000-fold to apparent homogeneity from rat liver. The molecular mass of the native enzyme was estimated to be 83 kDa by gel filtration. The enzyme showed a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis corresponding to a molecular mass of 17 kDa. Up to 24 residues of the NH2-terminal sequence were determined by Edman degradation, which released a single amino acid at each step. These results indicate that the enzyme consists of identical subunits. The purified enzyme was digested with lysyl endopeptidase or V8 protease, and 11 peptide fragments were isolated. On the basis of the sequences of these peptides, oligonucleotides were synthesized and used to screen a rat liver cDNA library, and one cDNA clone was isolated. The complete nucleotide sequence of the 1176-base pair cDNA was then determined. The deduced amino acid sequence contained 144 amino acid residues, but a NH2-terminal four-amino acid sequence was not found in the purified protein. Therefore, the mature protein consists of 140 amino acids. A single mRNA band of 1.3 kilobases was obtained by RNA blot analysis of rat liver. The predicted amino acid sequence of 6-pyruvoyl-tetrahydropterin synthase was compared with the Protein Sequence Database of the National Biomedical Research Foundation, revealing significant local similarity to large T antigens from the polyomavirus family." @default.
- W1489717679 created "2016-06-24" @default.
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- W1489717679 date "1991-11-01" @default.
- W1489717679 modified "2023-10-03" @default.
- W1489717679 title "Purification and cDNA cloning of rat 6-pyruvoyl-tetrahydropterin synthase." @default.
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- W1489717679 doi "https://doi.org/10.1016/s0021-9258(18)54778-5" @default.
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