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RAD50 protein of S.cerevisiae exhibits ATP-dependent DNA binding
1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.
Abstract:
RAD50 function of Saccharomyces cerevisiae is required during vegetative growth for recombinational repair of DNA double strand breaks, and during meiosis for initiation of meiotic recombination and formation of synaptonemal complex. RAD50 encodes a 153 kDa polypeptide which includes an amino-terminal ATP binding domain essential for function and two long heptad repeat regions. We show below that RAD50 protein purified from yeast exhibits ATP-dependent binding to double stranded DNA. Physical properties of the purified protein are also described. Models for RAD50 function in vivo are discussed.
Insights
The RAD50 protein from yeast is crucial for DNA repair and recombination. Purified RAD50 protein binds to double-stranded DNA in an ATP-dependent manner, shedding light on its in vivo functions.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- RAD50 protein in Saccharomyces cerevisiae is vital for DNA double-strand break repair during vegetative growth.
- It also plays a key role in initiating meiotic recombination and forming the synaptonemal complex during meiosis.
- The RAD50 gene encodes a large polypeptide with an essential N-terminal ATP-binding domain and heptad repeat regions.
Purpose of the Study:
- To investigate the biochemical properties of the purified RAD50 protein.
- To understand the mechanism of RAD50's interaction with DNA.
- To propose models for RAD50's function in vivo.
Main Methods:
- Protein purification from yeast.
- Biochemical assays to assess DNA binding.
- Characterization of physical properties of purified RAD50.
Main Results:
- Purified RAD50 protein from yeast demonstrates ATP-dependent binding to double-stranded DNA.
- Key physical properties of the purified RAD50 protein were elucidated.
- Experimental data supports the functional domains within the RAD50 polypeptide.
Conclusions:
- RAD50 protein's ATP-binding domain is essential for its DNA binding activity.
- The findings provide insights into the molecular mechanisms underlying DNA repair and recombination.
- Proposed models offer a framework for understanding RAD50's roles in yeast genetics.