Related Experiment Videos
Domain B of ARS307 contains two functional elements and contributes to chromosomal replication origin function
1Department of Microbiology and Molecular Genetics, UMD-New Jersey Medical School, Newark 07103.
Molecular and Cellular Biology
|November 1, 1994
Summary
This study identifies key DNA sequences, B1 and B2, within the ARS307 replication origin of Saccharomyces cerevisiae. These sequences are crucial for both plasmid and chromosomal origin function, with B1 essential for efficient chromosomal replication.
Area of Science:
- Molecular Biology
- Yeast Genetics
- DNA Replication
Background:
- ARS307 is a highly active replication origin in Saccharomyces cerevisiae.
- Its function depends on the autonomously replicating sequence (ARS) consensus sequence (ACS) and flanking domain B.
- Domain B is approximately 100 bp and contains essential sequences for ARS activity.
Purpose of the Study:
- To precisely define the sequences within domain B required for ARS307 function.
- To investigate the role of these sequences in both plasmid and chromosomal origins.
- To elucidate the functional subdomains within domain B.
Main Methods:
- Linker substitution mutagenesis was performed on domain B of ARS307.
- Mutated ARS307 constructs were analyzed for autonomous replication activity on plasmids.
- Mutations within the B1 element were used to replace the native chromosomal copy of ARS307.
Main Results:
- Mutagenesis of domain B identified two critical regions, B1 and B2, contributing to ARS activity.
- Similar to ARS1, domain B of ARS307 is composed of functional subdomains.
- Mutations in the B1 element significantly reduced chromosomal origin activity when ARS307 was replaced.
Conclusions:
- The B1 and B2 elements within domain B are essential for ARS307 function.
- The B1 element is indispensable for efficient chromosomal origin activity.
- Domain B of ARS307 contains functionally distinct subdomains critical for DNA replication initiation.