Understanding the Interaction Between Sir3p and Nucleosomal LRS Surface
Author Information
Author(s): Norris Anne, Bianchet Mario A., Boeke Jef D.
Primary Institution: Johns Hopkins University School of Medicine
Hypothesis
The LRS surface of the nucleosome is a binding site for a trans-acting silencing factor, and this interaction might be electrostatic in nature.
Conclusion
The study provides genetic evidence that the Sir3p BAH domain directly binds the LRS domain, suggesting an electrostatic model for their interaction.
Supporting Evidence
- The LRS domain is crucial for silencing at ribosomal DNA and telomeres.
- Mutations in histones H3 and H4 were identified as suppressors of the H3 A75V allele.
- Sir3p BAH domain mutations restored binding to telomeric DNA in LRS mutants.
Takeaway
Scientists studied how a part of DNA called the LRS interacts with a protein named Sir3p, finding that changes in their electrical charges affect their ability to silence genes.
Methodology
The researchers performed an EMS mutagenesis screen to identify suppressors of the H3 A75V LRS allele and characterized mutations in histones and the Sir3 protein.
Limitations
The study primarily focuses on specific mutations and may not account for all possible interactions affecting silencing.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website