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Pyrophosphate-condensing activity linked to nucleic acid synthesis
Nucleic Acids Research
|April 1, 1979
Summary
A novel enzymatic activity in DNA-dependent RNA polymerase conserves energy during RNA synthesis by condensing pyrophosphates. This suggests nucleic acid synthesis is an energy-conserving process involving multiple enzymes.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- RNA synthesis involves DNA-dependent RNA polymerase.
- Pyrophosphate molecules are liberated during RNA synthesis.
- Cellular energy is typically required for biosynthetic processes.
Purpose of the Study:
- To investigate a newly discovered enzymatic activity associated with DNA-dependent RNA polymerase.
- To understand the role of pyrophosphate condensation in nucleic acid synthesis.
- To determine if energy is conserved during nucleic acid synthesis.
Main Methods:
- Enzymatic assays were performed on purified DNA-dependent RNA polymerase preparations.
- The catalytic activity of pyrophosphate condensation was characterized.
- Cooperation between the novel activity and DNA-polymerase was tested.
Main Results:
- A new enzymatic activity was identified that catalyzes the condensation of two pyrophosphate molecules into orthophosphate and a trimetaphosphate-metal chelate.
- This activity was found to cooperate with DNA-polymerase when both enzymes originate from the same cellular source.
- The findings indicate that energy is conserved during nucleic acid synthesis and turnover.
Conclusions:
- Nucleic acid synthesis does not necessarily require external energy input from cellular resources.
- Nucleic acid synthesis is catalyzed by a complex enzyme system, including separate enzymes for polymerization and energy conservation via pyrophosphate condensation.