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DNA polymerase activity in plasma from leukaemic guinea-pigs
British Journal of Cancer
|April 1, 1976
Summary
Researchers identified two DNA polymerase activities in leukaemic guinea-pig plasma. One activity, likely a reverse transcriptase linked to GPLV, was sedimentable, while the other was soluble and likely cellular.
Area of Science:
- Biochemistry
- Molecular Biology
- Virology
Background:
- Leukaemic guinea-pig plasma contains enzymatic activities.
- DNA polymerase activity is crucial for cellular processes and viral replication.
Purpose of the Study:
- To characterize DNA polymerase activities in leukaemic guinea-pig plasma.
- To differentiate between viral and cellular DNA polymerases.
Main Methods:
- Enzyme activity assays on plasma samples.
- Sucrose density gradient centrifugation.
- Ribonuclease sensitivity assays.
- Template specificity analysis using poly(C).oligo(dG).
Main Results:
- Two distinct DNA polymerase activities were detected: sedimentable and non-sedimentable.
- The sedimentable enzyme was ribonuclease-sensitive, template-dependent (poly(C).oligo(dG)), and banded at 1.17 g/ml, suggesting it is a reverse transcriptase associated with GPLV.
- The non-sedimentable (soluble) enzyme was ribonuclease-stimulated, indicating a likely cellular origin.
Conclusions:
- Leukaemic guinea-pig plasma harbors both viral (GPLV-associated reverse transcriptase) and cellular DNA polymerase activities.
- Characterization of these enzymes aids in understanding viral pathogenesis and host-pathogen interactions.