Related Experiment Videos
Six human RNA polymerase subunits functionally substitute for their yeast counterparts
Molecular and Cellular Biology
|December 1, 1995
Summary
Human RNA polymerase II subunits hsRPB8 and hsRPB10 support yeast growth, while human hsRPB9 corrects yeast growth and mRNA start site defects. Six of seven tested human subunits substitute for yeast counterparts, showing conserved transcription machinery.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Eukaryotic transcription relies on RNA polymerase II (Pol II) complexes.
- Understanding functional conservation between human and yeast Pol II aids in deciphering fundamental biological processes.
Purpose of the Study:
- To investigate the functional relatedness of human and yeast transcription machinery components.
- To assess the ability of specific human Pol II subunits to substitute for their essential yeast homologs.
Main Methods:
- Assessing yeast cell growth with human subunits replacing yeast homologs.
- Evaluating mRNA start site selection in yeast cells lacking specific subunits.
- Using immunoprecipitation to confirm subunit assembly in yeast Pol II complexes.
Main Results:
- Human subunits hsRPB8 and hsRPB10 supported normal yeast cell growth.
- Human hsRPB9 corrected temperature-dependent growth defects and mRNA start site selection errors in yeast.
- Immunoprecipitation confirmed assembly of functional human subunits into yeast Pol II.
Conclusions:
- Significant functional conservation exists between human and yeast RNA polymerase II subunits.
- Human subunits can functionally replace yeast counterparts, highlighting conserved eukaryotic transcription mechanisms.
- Six of seven tested human subunits demonstrated substitutability for their yeast homologs in vivo.