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- W2064231752 abstract "We have purified a novel enzyme from eel white muscle which catalyzes the syntheses of imidazole dipeptides, such as carnosine (β-alanyl-l-histidine), anserine (β-alanyl-π-methyl-l-histidine), and balenine (ophidine; β-alanyl-τ-methyl-l-histidine), directly from their precursors. The enzyme was purified 1130-fold from eel muscle by a series of column chromatographies. Although eel muscle contains a large amount of carnosine and only trace amounts of anserine and balenine, the anserine synthesizing activity was by far the highest. From gel permeation chromatography, the molecular mass of the enzyme was calculated to be 275 kDa. SDS-PAGE of the purified enzyme represented a band around 43 kDa, suggesting that the native enzyme is a hexamer or heptamer. The optimal pH and temperature were around 9.5 and 60 °C, respectively. Km values for β-alanine and π-methyl-l-histidine were 44 and 89 mM, respectively. The enzyme was greatly activated by Zn2+ and inhibited by EDTA. The N-terminal amino acid sequence of 25 residues of the purified enzyme showed 52% amino acid identity to 38–62 residues of zebrafish haptoglobin precursor. The purified enzyme also exhibited hydrolytic activity against these imidazole dipeptides." @default.
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- W2064231752 date "2007-04-01" @default.
- W2064231752 modified "2023-10-01" @default.
- W2064231752 title "Purification and characterization of a novel imidazole dipeptide synthase from the muscle of the Japanese eel Anguilla japonica" @default.
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- W2064231752 doi "https://doi.org/10.1016/j.cbpb.2006.12.002" @default.
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