The voltage-sensitive sodium channel from rabbit skeletal muscle. Chemical characterization of subunits.

作者: R.H. Roberts , R.L. Barchi

DOI: 10.1016/S0021-9258(18)61653-9

关键词: Amino acidSkeletal muscleATP synthase alpha/beta subunitsG alpha subunitSodiumBiochemistryMolecular biologyBeta (finance)ChemistryProtein subunitGel electrophoresis

摘要: The alpha and beta subunits of the rabbit skeletal muscle sodium channel have been separated isolated preparatively under denaturing conditions. In this channel, subunit is not linked covalently to subunit. subjected amino acid carbohydrate analysis. Both are heavily glycosylated (alpha = 26.5%, 29.7% by weight) with N-acetylneuraminic N-acetylhexosamines representing predominant monosaccharides in each. Enzymatic deglycosylation neuraminidase endoglycosidase F yielded single core peptides approximately 209 kDa for 26.5 Based on known composition, molecular masses are, therefore, 285 37.5 beta, respectively. Using subunits, we calibrated our protein-labeling system dodecyl sulfate-polyacrylamide gel electrophoresis determined stoichiometry channel; native preparation, molar ratio alpha:beta 1 : 1.

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