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1. Adult rabbit skeletal-muscle myosin has been shown to contain 1.0 residue of mono-N(in)-methyl-lysine and 3.3 residues of tri-N(in)-methyl-lysine per molecule of molecular weight 5. 2. The methyl-lysines appear to be located in the subfragment 1 portion of the myosin molecule. 3. Methyl-lysines are not present in actin, tropomyosin, inhibitory factor and calcium-sensitizing factor. 4. Enzymic methylation of histidine and lysine residues of myosin has been demonstrated in vitro. 5. The methylation of histidine and lysine of the total myofibrillar protein occurs after peptide-bond synthesis. 6. Although methylated lysines and 3-methyl-histidine could not be detected by analysis of hydrolysates, radiochemical evidence is provided for the presence of these residues in the soluble-protein fraction of rabbit skeletal muscle.

Occurrence and formation of the N∈-methyl-lysines in myosin and the myofibrillar proteins