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• W2022133134 abstract "The asymmetric forms of acetylcholinesterase were purified from the electric organs of the electric rays Narke japonica and Torpedo californica, and their properties were compared. Asymmetric acetylcholinesterase was purified by immunoaffinity chromatography with a monoclonal antibody (Nj-601) to acetylcholinesterase. The MgCl2 extracts of these electric organs were applied to a column of Nj-601-Sepharose, and the bound acetylcholinesterase was eluted by lowering the pH of the eluent to 2.8. The purified asymmetric acetylcholinesterases gave peaks of 17 S (A12) and 13 S (A8) on sucrose density gradients. The enzyme from N. japonica contained more A8 than A12, while that of T. californica contained more A12. After treatment with collagenase, the enzymes gave three peaks on sedimentation; 20 S, 16 S and 11 S for N. japonica, and 19 S, 15 S and 11 S for T. californica, indicating the presence of collagen-like tails. On polyacrylamide gel electrophoresis in sodium dodecyl sulfate, the asymmetric acetylcholinesterase from N. japonica gave bands of Mr 140 000, 100 000, 70 000 and 60 000, while that from T. californica gave bands of Mr 140 000, 100 000, 70 000 and 55 000. The bands of Mr 70 000 and 140 000 were monomers and non-reducible dimers, respectively, of the catalytic subunits. The bands of Mr 60 000 and 55 000 were the tail subunits, since collagenase treatment of the purified enzymes markedly decreased the amounts of these components. The Mr 100 000 subunit constituted less than 3% of the total asymmetric acetylcholinesterase from N. japonica but 18% of that from T. californica. The tail subunits constituted 6-8% of the two preparations. The catalytic subunits and the Mr 100 000 subunits bound concanavalin A, indicating that they are glycoproteins. The amino acid compositions of the enzymes from N. japonica and T. californica were very similar. Both contained hydroxyproline and hydroxylysine, characteristic of the collagen-like tails. The enzyme required divalent metal ions for activity, but only Mn2+, Mg2+ and Ca2+ were effective. Mn2+ was effective at the lowest concentrations, while Mg2+ gave the highest activity." @default.
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• W2022133134 date "1985-12-01" @default.
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• W2022133134 title "Comparison of asymmetric forms of acetylcholinesterase from the electric organ of Narke japonica and Torpedo californica" @default.
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• W2022133134 doi "https://doi.org/10.1111/j.1432-1033.1985.tb09329.x" @default.
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