Abstract
The soluble creatine kinase isozymes CK-II, CK-III, and CK-IV fromXenopus laevis have been purified to apparent homogeneity and their subunits characterized by means of molecular weight, peptide pattern, and dissociation-reassociation experiments. CK-III and CK-IV are homodimeric isozymes whose subunits are distinct in both molecular weight (42,000 and 41,000, respectively) andStaphylococcus aureus V8 peptide pattern. In dissociation-reassociation experiments, those two subunits do form active heterodimeric isozymes with one another or with rabbit M-CK subunits. Hybrid CK-III/IV isozymes occur also during embryonic differentiation and in adult heart muscle, whereas most other adult tissues contain only homodimeric CK-III or CK-IV isozymes. The CK-II isozyme is a heterodimer composed of one CK-III subunit and another subunit specific to CK-II (M r =41,000). Neitherin vivo norin vitro does this subunit seem able to form homodimers or heterodimers with CK-IV and rabbit M-CK subunits. If we take into account the apparent association of CK-I isozyme with cellular organelles, these results corroborate earlier statements and suggest that the CK isozyme system ofX. laevis is encoded by at least four differentially regulated genomic loci.
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Robert, J., Kobel, H.R. Purification and characterization of cytoplasmic creatine kinase isozymes ofXenopus laevis . Biochem Genet 26, 543–555 (1988). https://doi.org/10.1007/BF02399600
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DOI: https://doi.org/10.1007/BF02399600