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- W1506594192 abstract "The complete amino acid sequence of the selenoprotein phospholipid-hydroperoxide glutathione peroxidase (PHGPX) from pig heart has been deduced from the corresponding genomic DNA, the cDNA covering the coding region, and by sequencing the N terminus of the protein. The maximum length of the peptide chain derived from the cDNA amounts to 170 amino acid residues. By protein sequencing the N-terminal residues methionine and cysteine of the deduced sequence were found to be cleaved. The molecular mass of 19,671 Da obtained by laser desorption mass spectroscopy, however, significantly exceeds the mean molecular mass of 19,257.09 calculated for the sequence 3-170 of PHGPX, thus indicating posttranscriptional modification. In contrast to glutathione peroxidase (GPX) the coding area of the PHGPX gene is composed of seven exons. Only the amino acid sequences encoded by the third and fifth exon are highly homologous to GPX sequences. The amino acid residues selenocysteine, tryptophan, and glutamine forming the catalytic site in bovine GPX are conserved in homologous positions of PHGPX, whereas the arginine residues presumed to bind GSH in GPX are not. Gaps in the PHGPX sequence correspond to subunit interaction sites of the tetrameric GPX. The data suggest an identical catalytic mechanism of the selenoperoxidases, a less stringent substrate specificity of PHGPX, and explain the monomeric nature of PHGPX. As in other selenoproteins, the selenocysteine residue of PHGPX is encoded by UGA. The 3'-untranslated region (UTR) of the PHGPX shows a limited consensus with that of GPX and 5'-deiodinase, where it was shown to be responsible for the decoding of UGA as selenocysteine. The 3'-UTR of PHGPX can form a stem/loop as in other mammalian selenoprotein genes. The 5'-UTR and the first intron of the PHGPX gene contain a variety of putative regulatory elements indicating hormonal control." @default.
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- W1506594192 date "1994-03-01" @default.
- W1506594192 modified "2023-10-10" @default.
- W1506594192 title "Phospholipid-hydroperoxide glutathione peroxidase. Genomic DNA, cDNA, and deduced amino acid sequence." @default.
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- W1506594192 doi "https://doi.org/10.1016/s0021-9258(17)37290-3" @default.
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