title: Nucleotide sequence of the dihydrofolate reductase gene of Saccharomyces cerevisiae.
abstract: The nucleotide sequence of a DNA fragment that contained the Saccharomyces cerevisiae gene DFR coding for dihydrofolate reductase (DHFR) was determined. The DHFR was encoded by a 633-bp open reading frame, which specified an Mr24264 protein. The polypeptide was significantly related to the DHFRs of chicken liver and Escherichia coli. The yeast enzyme shared 60 amino acid (aa) residues with the avian enzyme and 51 aa residues with the bacterial enzyme. DHFR was overproduced about 40-fold in S. cerevisiae when the cloned gene was present in the vector YEp24. As isolated from the Saccharomyces library, the DFR gene was not expressed in E. coli. When the gene was present on a 1.8-kb BamHI-SalI fragment subcloned into the E. coli vector, pUC18, weak expression in E. coli was observed.
authors.affiliation: Wellcome Research Laboratories, Research Triangle Park, NC 27709.
authors.forename: M E
authors.initials: ME
authors.lastname: Fling
authors.forename: J
authors.initials: J
authors.lastname: Kopf
authors.forename: C A
authors.initials: CA
authors.lastname: Richards
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D009710:Nucleotide Mapping; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*; D013045:Species Specificity; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*
chemical_list: D013762:Tetrahydrofolate Dehydrogenase; D004262:DNA Restriction Enzymes