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ATPase switches controlling DNA replication initiation
Current Opinion in Cell Biology
|May 10, 2000
Summary
ATP-binding proteins regulate DNA replication initiation. In yeast, origin recognition complex and Cdc6p use ATP binding and hydrolysis as a molecular switch, similar to E. coli factors, controlling replication start.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- ATP-binding and hydrolyzing proteins are crucial for DNA replication initiation.
- Eukaryotic DNA replication involves AAA+ ATPase family members like origin recognition complex and Cdc6p.
- Bacterial replication initiation factors, such as DnaA and DnaC, are also ATP-dependent.
Purpose of the Study:
- To investigate the distinct roles of ATP binding and hydrolysis in eukaryotic DNA replication.
- To compare the ATP-dependent regulation mechanisms between yeast and bacterial replication initiation factors.
- To elucidate how ATP acts as a molecular switch in coupling replication initiation events.
Main Methods:
- Comparative analysis of AAA+ ATPase family proteins in Saccharomyces cerevisiae and Escherichia coli.
- Biochemical studies on the functions of origin recognition complex and Cdc6p.
- Investigation of ATP binding and hydrolysis activities in replication initiation factors.
Main Results:
- Origin recognition complex and Cdc6p in yeast exhibit separable roles for ATP binding and hydrolysis.
- The ATP-dependent regulation of yeast replication proteins shows functional parallels with E. coli DnaA and DnaC.
- ATP binding and hydrolysis function as a molecular switch, altering protein function and coupling replication events.
Conclusions:
- ATP binding and hydrolysis act as a conserved molecular switch in DNA replication initiation across species.
- This switch mechanism is critical for coordinating key events during the initiation of DNA replication.
- Understanding this regulation provides insights into the fundamental processes of DNA replication.
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