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Related Experiment Videos

CTP: CMP phosphotransferase activity in L1210 cells.

P Chiba1, J G Cory

  • 1Department of Internal Medicine, University of South Florida College of Medicine, Tampa 33612.

Cancer Biochemistry Biophysics
|May 1, 1988
PubMed
Summary

Enzyme activity interfering with ribonucleotide reductase measurements was identified in L1210 cell extracts. Monitoring nucleoside diphosphate levels is essential for accurate CDP reductase activity assessment in crude cell extracts.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Cell Biology

Background:

  • Accurate measurement of ribonucleotide reductase activity is crucial for understanding DNA synthesis and repair.
  • Cell-free extracts can contain interfering enzymes that compromise assay reliability.

Purpose of the Study:

  • To identify and characterize enzymes that interfere with the measurement of ribonucleotide reductase activity in L1210 cell extracts.
  • To determine the impact of these interfering enzymes on CDP reductase activity assays.

Main Methods:

  • Preparation of cell-free extracts from L1210 cells.
  • Enzyme assays to detect interfering activities.
  • Chromatographic purification using ATP-agarose columns.

Main Results:

  • A myokinase-type enzyme, CTP:CMP phosphotransferase, was identified, catalyzing 2CDP <=> CMP + CTP.
  • This enzyme activity was not removed by ATP-agarose column chromatography.
  • The presence of this enzyme necessitates monitoring nucleoside diphosphate levels.

Conclusions:

  • A significant interfering enzyme activity (myokinase-type) exists in L1210 cell extracts affecting ribonucleotide reductase measurements.
  • Standard purification methods do not eliminate this interference.
  • Accurate CDP reductase activity determination requires careful monitoring of nucleoside diphosphate substrate levels in crude extracts.

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