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J. Biol. Chem., Vol. 258, Issue 15, 9166-9174, Aug, 1983

The complete amino acid sequence of rabbit muscle phosphoglucomutase

WJ Ray Jr, MA Hermodson, JM Puvathingal and WC Mahoney

The complete amino acid sequence of rabbit muscle phosphoglucomutase has been determined by isolating the 11 peptide fragments produced by the cyanogen bromide cleavage reaction and subjecting these to automated sequencing procedures. Products produced by treatment of some of these fragments with hydroxylamine, iodosobenzoic acid, mild acid, cyanogen bromide in formic and heptafluorobutyric acids, Staphylococcus aureus V8 protease, and trypsin (with or without blocking at lysine residues) were used to complete the sequence for each of the cyanogen bromide fragments. The cyanogen bromide fragments were ordered by isolating the four tryptic peptides produced by a limited tryptic digest of the native enzyme in the presence of its substrates and its bivalent metal ion activator, Mg2+, degrading these by means of trypsin, after blocking digestion at lysine residues, and isolating and identifying all fragments thus produced that contained 10 or more residues. The 561-residue sequence thus obtained is one of the longest that has been determined by chemical means. There is excellent agreement between this sequence and published compositions after appropriate normalization. The absorbance of the enzyme is about 7.0 at 278 nm for a 1% solution; this value is 9% lower than that previously used.
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