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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Turnover of the creatine kinase subunits in chicken myogenic cell cultures and in fibroblasts.

The rates of degradation of creatine kinase subunits, M-CK and B-CK subunits, were measured in cultured myogenic cells and in subcultured fibroblasts. In differentiated myogenic cells, the myotubes, both M-CK and B-CK subunits are synthesized. Their rates of degradation were compared. The M-CK subunits is slightly more stable and is degraded with an average apparent half-life of 75 h, whereas that of the B-CK subunit was shorter with 63 h. The turnover properties of M-CK subunit from soluble and of myofibril-bound MM-CK homodimeric creatine kinase isoenzyme isolated from breast muscle of young chickens were identical. The apparent half-life of the B-CK subunit was also determined in subcultured fibroblasts and 5-bromo-2'-deoxyuridine-treated cells, and found to be shorter than in myotubes (46 h and 37 h respectively). Similar observations were made for myosin heavy chain, actin and total acid-precipitable material. It appears therefore that proteins are in general degraded more slowly in differentiated myogenic cells. The differences in the stability of M-CK and B-CK subunits in myotubes probably do not reflect a major regulatory mechanism of the creatine kinase isoenzyme transition.[1]


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