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The yeast DNA polymerase-primase complex: genes and proteins
P Plevani1, M Foiani, M Muzi Falconi
1Dipartimento di Genetica, Università degli Studi di Milano, Italy.
Biochimica Et Biophysica Acta
|December 20, 1988
Summary
Researchers cloned genes for yeast DNA polymerase-primase complex subunits. They identified a conserved region (region P) potentially crucial for protein interactions and mapped the primase active site.
Area of Science:
- Molecular Biology
- Biochemistry
- Yeast Genetics
Background:
- The yeast DNA polymerase-primase complex consists of four polypeptides: p180, p74, p58, and p48.
- Understanding the functional domains and interactions within this complex is crucial for comprehending DNA replication in yeast.
Purpose of the Study:
- To clone the genes encoding the yeast DNA polymerase-primase complex subunits.
- To identify conserved regions within yeast DNA polymerase alpha and investigate their role in complex stability.
- To map the active site of yeast DNA primase using biochemical methods.
Main Methods:
- Gene cloning of yeast DNA polymerase-primase complex subunits.
- Protein sequence comparison to identify homologous regions.
- Site-directed mutagenesis and sequencing of a temperature-sensitive mutant (POL1 gene).
- Autocatalytic affinity labeling to map the primase active center.
Main Results:
- All genes for the four yeast DNA polymerase-primase polypeptides have been successfully cloned.
- Yeast DNA polymerase I (alpha) shares homology with other DNA polymerases, with a conserved 'region P' also found in human DNA polymerase alpha.
- A mutation affecting complex stability was located within region P, suggesting its role in protein-protein interactions.
- The active center of yeast DNA primase was mapped, indicating participation of both p48 and p58 subunits in catalysis.
Conclusions:
- Region P is hypothesized to be critical for protein-protein interactions within the DNA polymerase-primase complex.
- The findings provide insights into the structural organization and functional domains of the yeast DNA polymerase-primase complex.
- Both p48 and p58 subunits are essential components of the catalytic site of yeast DNA primase.
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