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- W2034962624 abstract "V. M. Mahnir, E. P. Kozlovskaya and G. B. Elyakov. Modification of arginine in sea anemone toxin RTX-III from Radianthus macrodactylus. Toxicon27, 1075–1084, 1989.—Chemical modifications of the polypeptide neurotoxin RTX-III have allowed us to study the functional role of Arg residues. The effect of chemical modification has been estimated by measuring toxicity in mice. 2,4-Pentanedione did not react with Arg residues of RTX-III even after 100 hr incubation. Malonic aldehyde reacted readily with RTX-III, yielding an unusual derivative; a Schiff's base obtained by condensation of one of two aldehyde groups of malonic aldehyde with the guanidine group. The derivative was one-fourth as toxic as the native toxin. Modification of the guanidine side chain of Arg-13 with both 1,2-cyclohexanedione and phenylglyoxal decreased the toxicity of RTX-III by a factor of five. We conclude that Arg-13 is not fully responsible for toxicity. The toxin-receptor attachment might be multipoint, involving several structural elements of the protein molecule, with Arg-13, probably being one of them. The guanidine side chain of Arg-45 is buried in the sequence and apparently functionally nonessential." @default.
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- W2034962624 date "1989-01-01" @default.
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- W2034962624 title "Modification of arginine in sea anemone toxin RTX-III from Radianthus macrodactylus" @default.
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- W2034962624 doi "https://doi.org/10.1016/0041-0101(89)90001-9" @default.
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