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Specificity Determination in Saccharomyces cerevisiae Killer Virus Systems
Lina Aitmanaitė1, Aleksandras Konovalovas1, Povilas Medvedevas1
1Laboratory of Nucleic Acid Biochemistry, Institute of Biosciences, Life Sciences Center, Vilnius University, Vilnius 10257, Lithuania.
Microorganisms
|January 27, 2021
Summary
Yeast killer phenotype relies on double-stranded RNA (dsRNA) viruses. Researchers found that viral capsid proteins can nonspecifically exclude viruses, but specific interactions are crucial for maintaining certain viral pairs, suggesting complex virus-host dynamics.
Area of Science:
- Microbiology
- Virology
- Molecular Biology
Background:
- Saccharomyces yeasts host double-stranded RNA (dsRNA) viruses that confer a killer phenotype, beneficial for host survival.
- The interaction between LA and M virus pairs within yeast suggests a complex compatibility system governing their coexistence.
Purpose of the Study:
- To elucidate the molecular basis of compatibility between different yeast dsRNA virus pairs.
- To investigate the mechanisms underlying virus exclusion and maintenance within yeast cells using viral proteins expressed in trans.
Main Methods:
- Expression of viral proteins in trans to challenge inherent yeast viruses.
- Assessing virus exclusion and maintenance dynamics mediated by viral capsid proteins.
- Investigating the role of satellite viruses in the maintenance of LA viruses.
Main Results:
- Abridged capsid proteins demonstrated complete and nonspecific exclusion of yeast viruses, indicating general Totiviridae maintenance mechanisms.
- Specific interactions were observed in the exclusion of LA viruses and the maintenance of M viruses by trans-expressed viral capsid proteins.
- The satellite virus was found to be essential for LA virus maintenance, highlighting M dsRNA's potential selfish behavior.
Conclusions:
- Yeast dsRNA virus interactions involve both generic exclusion mechanisms and specific recognition events.
- The satellite virus plays a critical role in the propagation of LA viruses, suggesting a complex, potentially selfish, viral ecosystem within yeast.
