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- W2010366556 abstract "We identified age-dependent post-translational modifications of skeletal muscle glycogen phosphorylase b (Ph-b), isolated from F1 hybrids of Fisher 344×Brown Norway rats. Ph-b isolated from 34 months old rats showed a statistically significant decrease in specific activity compared to 6 months old animals: 13.8±0.7 vs. 20.6±0.8 Umg−1 protein, respectively. Western blot analysis of the purified Ph-b with anti-3-NT antibodies revealed an age-dependent accumulation of 3-nitrotyrosine (3-NT), quantified by reverse-phase HPLC–UV analysis to increase from 0.05±0.03 to 0.34±0.11 (mol 3-NT/mol Ph-b) for 6 vs. 34 months old rats, respectively. HPLC–nanoelectrospray ionization—tandem mass spectrometry revealed the accumulation of 3-NT on Tyr113, Tyr161 and Tyr573. While nitration of Tyr113 was detected for both young and old rats, 3-NT at positions 161 and 573 was identified only for Ph-b isolated from 34 months old rats. The sequence of the rat muscle Ph-b was corrected based on our protein sequence mapping and a custom rat PHS2 sequence containing 17 differently located amino acid residues was used instead of the database sequence. The in vitro reaction of peroxynitrite with Ph-b resulted in the nitration of multiple Tyr residues at positions 51, 52, 113, 155, 185, 203, 262, 280, 404, 473, 731, and 732. Thus, the in vitro nitration conditions only mimic the nitration of a single Tyr residue observed in vivo suggesting alternative pathways controlling the accumulation of 3-NT in vivo. Our data show a correlation of age-dependent 3-NT accumulation with Ph-b inactivation." @default.
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- W2010366556 date "2006-04-01" @default.
- W2010366556 modified "2023-10-03" @default.
- W2010366556 title "Age-associated tyrosine nitration of rat skeletal muscle glycogen phosphorylase b: characterization by HPLC–nanoelectrospray–Tandem mass spectrometry" @default.
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- W2010366556 doi "https://doi.org/10.1016/j.exger.2006.02.012" @default.
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