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- W2411944735 abstract "In the calcium-free medium the EGTA-treated rat myocardial fibres developed rigor tension dependent on the concentration of MgATP in the bathing solution: half-maximal tension was recorded at 2.5 mM MgATP and the maximal tension at 0.1 mM. However, in the presence of 15 mM phosphocreatine without added creatine kinase a decrease of MgATP concentration to 0.1 mM did not result in any development of rigor tension. In the presence of MgADP phosphocreatine decreased rigor tension more rapidly and to the higher extent than MgATP. At 5 mM MgADP half-maximal rigor tension was observed in the presence of 2 mM phosphocreatine which is close to the km value for phosphocreatine in the creatine kinase reaction. These results demonstrate that the native creatine kinase in the EGTA-treated fibres is able to create high local ATP concentration in the myofibrillar compartment at the expense of phosphocreatine under the conditions of deficiency or even absence of ATP. It appears that at the energy supply disturbances the myocardial contracture develops at least partially due to low activity of the myofibrillar creatine kinase because of phosphocreatine deficiency." @default.
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- W2411944735 date "1985-03-01" @default.
- W2411944735 modified "2023-09-23" @default.
- W2411944735 title "[Ability of a phosphocreatine-myofibrillar creatine kinase system to prevent the rigor tension of myocardial fibers]." @default.
- W2411944735 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3986231" @default.
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