Amino acid sequence of two cyanogen bromide fragments of glycogen phosphorylase

Abstract

The strategy and experimental details to prove the amino acid sequence of 2 large fragments of rabbit muscle glycogen phosphorylase generated by cleavage with cyanogen bromide are presented. These fragments, CB18 and CB15, represent 241 of the 841 residues in the whole molecule. In addition to applying methods of automated liquid phase Edman degradation, techniques of selective immobilization and solid phase Edman degradation are used. One of the 2 cyanogen bromide fragments (CB15) contains 2 of the sites of cleavage with hydroxylamine which have proved to be important in the overall strategy of determining the complete sequence of this molecule. Together with the accompanying reports, the present communication completes the proof of the amino acid sequence of phosphorylase and provides the basis for examining the relationship between its structure and function.