Reversible neuromuscular blocking action of carbohymethylated α-bungarotoxin
Carbanidomethylation of the reduced Cys 29-Cys 33 bridge of α-bungarotoxin ( Bungarus multicinctus postsynaptic neurotoxin) did not alter the LD 50 or irreversibility of the toxin, while carboxymethylated α-bungarotoxin was less potent and its neuromuscular blocking action in mouse diaphragm was rev...
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Published in | Biochimica et biophysica acta. General subjects Vol. 755; no. 2; pp. 210 - 216 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
25.01.1983
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Abstract | Carbanidomethylation of the reduced Cys
29-Cys
33 bridge of α-bungarotoxin (
Bungarus multicinctus postsynaptic neurotoxin) did not alter the LD
50 or irreversibility of the toxin, while carboxymethylated α-bungarotoxin was less potent and its neuromuscular blocking action in mouse diaphragm was reversible. The circular dichroic spectra of both modified toxins were similar but slightly different from that of native toxin. Neuromuscular transmission in the chick biventer cervicis nerve-muscle preparation could be blocked by the carboxymethylated toxin, and reactivated by washing, whereas the response of the muscle to extrinsic acetylcholine could also be blocked but was hardly restored by washing. These results suggest that carboxymethylated toxin can differentiate between junctional and extrajunctional acetylcholine receptors in chick skeletal muscle. |
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AbstractList | Carbanidomethylation of the reduced Cys
29-Cys
33 bridge of α-bungarotoxin (
Bungarus multicinctus postsynaptic neurotoxin) did not alter the LD
50 or irreversibility of the toxin, while carboxymethylated α-bungarotoxin was less potent and its neuromuscular blocking action in mouse diaphragm was reversible. The circular dichroic spectra of both modified toxins were similar but slightly different from that of native toxin. Neuromuscular transmission in the chick biventer cervicis nerve-muscle preparation could be blocked by the carboxymethylated toxin, and reactivated by washing, whereas the response of the muscle to extrinsic acetylcholine could also be blocked but was hardly restored by washing. These results suggest that carboxymethylated toxin can differentiate between junctional and extrajunctional acetylcholine receptors in chick skeletal muscle. |
Author | Chewn-Lang Ho Charng-Jui Chen Shih-Hsiung Wu |
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Keywords | Carboxymethylation Bungarotoxin Acetylcholine receptor Neurotoxin Circular dichroism |
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References | Chang, Su (BIB16) 1975; 33 Chang, Lee (BIB1) 1963; 144 Chang, Su, Tung (BIB17) 1977; 268 Chang, Tang (BIB15) 1974; 282 Mebs, Narita, Iwanaga, Samejima, Lee (BIB19) 1971; 44 Lee (BIB13) 1972; 12 Botes (BIB5) 1971; 26 Ginsborg, Warriner (BIB10) 1960; 15 Lee, Chang, Chen (BIB14) 1972; 71 Albuguergue, Eldefrawi, Eldefrawi (BIB4) 1979; Vol. 52 Lee, Chang, Kau, Luh (BIB8) 1972; 72 Narahashi (BIB3) 1974; 54 Chicheportiche, Vincent, Kopeyan, Schweitz, Lazdunski (BIB7) 1975; 14 Chang, Brauer, Wittmann-Leibold (BIB9) 1978; 93 Botes (BIB6) 1974; 359 Litchfield, Wilcoxon (BIB12) 1949; 96 Changeux, Kakai, Lee (BIB2) 1970; 67 Bülbring (BIB11) 1946; 1 Visser, Louw (BIB18) 1978; 533 |
References_xml | – volume: 33 start-page: 337 year: 1975 end-page: 344 ident: BIB16 publication-title: Eur. J. Pharmacol. – volume: 72 start-page: 71 year: 1972 end-page: 82 ident: BIB8 publication-title: J. Chromatog. – volume: 533 start-page: 80 year: 1978 end-page: 89 ident: BIB18 publication-title: Biochim. Biophys. Acta. – volume: 282 start-page: 379 year: 1974 end-page: 388 ident: BIB15 publication-title: Naunyn-Schmiedeberg's Arch. Pharmacol. – volume: 359 start-page: 242 year: 1974 end-page: 247 ident: BIB6 publication-title: Biochim. Biophys. Acta – volume: 268 start-page: 449 year: 1977 end-page: 465 ident: BIB17 publication-title: J. Physiol. – volume: 144 start-page: 241 year: 1963 end-page: 257 ident: BIB1 publication-title: Arch. Int. Pharmacodyn. – volume: 96 start-page: 99 year: 1949 end-page: 113 ident: BIB12 publication-title: J. Pharmacol. Exp. Ther. – volume: 93 start-page: 205 year: 1978 end-page: 214 ident: BIB9 publication-title: FEBS Lett. – volume: 15 start-page: 418 year: 1960 end-page: 425 ident: BIB10 publication-title: Br. J. Pharmacol. – volume: 44 start-page: 711 year: 1971 end-page: 716 ident: BIB19 publication-title: Biochem. Biophys. Res. Commun. – volume: 1 start-page: 38 year: 1946 end-page: 61 ident: BIB11 publication-title: Br. J. Pharmacol. – volume: 12 start-page: 265 year: 1972 end-page: 286 ident: BIB13 publication-title: Annu. Rev. Pharmacol. – volume: 71 start-page: 344 year: 1972 end-page: 349 ident: BIB14 publication-title: J. Formosan Med. Assoc. – volume: Vol. 52 start-page: 377 year: 1979 end-page: 402 ident: BIB4 publication-title: Handbook of Experimental Pharmacology – volume: 67 start-page: 1241 year: 1970 end-page: 1274 ident: BIB2 publication-title: Proc. Natl. Acad. Sci. U.S.A. – volume: 14 start-page: 2081 year: 1975 end-page: 2091 ident: BIB7 publication-title: Biochemistry – volume: 26 start-page: 7383 year: 1971 end-page: 7391 ident: BIB5 publication-title: J. Biol. Chem. – volume: 54 start-page: 813 year: 1974 end-page: 889 ident: BIB3 publication-title: Physiol. Rev. |
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Snippet | Carbanidomethylation of the reduced Cys
29-Cys
33 bridge of α-bungarotoxin (
Bungarus multicinctus postsynaptic neurotoxin) did not alter the LD
50 or... |
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StartPage | 210 |
SubjectTerms | Acetylcholine receptor Bungarotoxin Carboxymethylation Circular dichroism Neurotoxin |
Title | Reversible neuromuscular blocking action of carbohymethylated α-bungarotoxin |
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