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. 1974 Sep;142(3):685–690. doi: 10.1042/bj1420685

Thymidine kinase activity in cardiac muscle during embryonic and postnatal development

Paul C Gillette 1, William C Claycomb 1,*
PMCID: PMC1168335  PMID: 4377215

Abstract

Cytoplasmic thymidine kinase from cardiac muscle of the rat has been characterized. It has a pH optimum of 9.0 and a Km value for thymidine of 1.6μm. The sedimentation coefficient of this enzyme in sucrose gradients is 4.5S, which represents a molecular weight of approx. 69000. Thymidine kinase prepared from cardiac muscle of foetal, neonatal and adult rats is inhibited by dTTP and dTDP; there is neither inhibition nor stimulation by dTMP, dCTP, dATP, dGTP or cyclic AMP. The activity of thymidine kinase in differentiating cardiac muscle of foetal and neonatal rats declines progressively with development, reaching adult values of almost zero by the fifteenth to seventeenth day of postnatal development. This represents a 70-fold decrease in enzyme activity from 3 days before birth to 17 days after birth. The loss of thymidine kinase activity in differentiating cardiac muscle correlates temporally with the cessation of DNA biosynthesis and the loss of cytoplasmic DNA polymerase activity in this tissue.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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