Structural studies on rabbit skeletal muscle actin. Ordering of the peptides produced by cleavage with cyanogen bromide.

The 17 peptides produced by cleavage of actin with cyanogen bromide have been ordered with regard to their sequence in the actin molecule. Tryptic digestion of actin followed by isolation of the methionine-containing "overlap" peptides permitted the unique alignment of most, but not all of the cyanogen bromide peptides. However, maleylation of the actin molecule followed by tryptic digestion and isolation of methionine-containing peptides from maleylated actin permitted the proper placement of the remaining cyanogen bromide peptides. The ordering of cyanogen bromide peptides, together with the amino acid sequence of the individual peptides, constitutes the entire amino acid sequence of rabbit skeletal muscle actin (ELZINGA, M., COLLINS, J. H., KUEHL, W. M., and ADENLSTEIN, R. S. (1973) Proc. Natl. Acad. Sci. U. S. A. 70,2687-2691).