Abstract
The immunopurified yeast DNA polymerase--DNA primase complex is constituted by DNA polymerase I polypeptides and by three other protein species, called p74, p58 and p48, which we show to be immunologically unrelated. The gene encoding the p48 polypeptide has been identified by immunological screening of a lambda gt11 yeast genomic DNA library. Antiserum specific for p48 inhibits DNA primase, and immunoreactive, inhibitory antibodies are affinity-purified by the clone-encoded protein, thus relating the p48 polypeptide to DNA primase activity. The entire gene has been cloned, and the 1.45-kb p48 mRNA is overproduced in cells containing the gene in high copy number. Gene disruption and Southern hybridization experiments demonstrate that the p48 protein is encoded by a single gene and it performs an essential function.
MeSH Terms
Cloning, Molecular
DNA Primase
DNA Restriction Enzymes
Escherichia coli/genetics
Genes
Genes, Fungal
Nucleic Acid Hybridization
Protein Biosynthesis
RNA Nucleotidyltransferases/genetics,isolation & purification
Saccharomyces cerevisiae/enzymology,genetics
Transcription, Genetic
Chemicals
DNA Primase
RNA Nucleotidyltransferases
DNA Restriction Enzymes
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Lucchini G
Francesconi S
Foiani M
Badaracco G
Plevani P
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