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Published information on the properties of two proteins from chicken muscle, creatine kinase (MM-creatine kinase) and an M-line protein, suggested that they might be identical molecules. Different published procedures were used to purify the two proteins to homogeneity, and the properties of the two preparations were compared. Creatine kinase specific activity increased during purification of M-line protein, reaching a value comparable to that of purified MM-creatine kinase. The two proteins migrated identically in two electrophoretic systems and, after electrophoresis, both could be stained for creatine kinase activity. Double immunodiffusion tests with antibody prepared against MM-creatine kinase established the serological identity of the two protein preparations. Immunofluorescent studies showed that antiserum against MM-creatine kinase was bound in a regular pattern at the centers of the A-band regions of isolated myofibrils. These data show conclusively that the M-line protein and MM-creatine kinase are identical.

A Protein That Binds Specifically to the M-Line of Skeletal Muscle Is Identified as the Muscle Form of Creatine Kinase