title: Analysis of a eukaryotic beta-galactosidase gene: the N-terminal end of the yeast Kluyveromyces lactis protein shows homology to the Escherichia coli lacZ gene product.
abstract: The LAC4 gene of Kluyveromyces lactis, encoding the enzyme beta-galactosidase was mapped on a cloned DNA fragment and the sequence of the 5' end was determined. This sequence includes the 5' regulatory region involved in the induction by lactose and the N-terminal end of the protein coding region. Comparison of the deduced amino acid sequence of this eukaryotic enzyme with the N-terminal end of the Escherichia coli beta-galactosidase revealed substantial homology. Two major RNA initiation sites were mapped at -115 and -105. A number of structural peculiarities of the 5'non-coding region are discussed as in comparison to Saccharomyces cerevisiae genes.
mesh_terms: D000595:Amino Acid Sequence; D001203:Ascomycota / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D005696:Galactosidases / Q000235:genetics*; D005796:Genes; D005798:Genes, Bacterial; D007763:Lac Operon; D010957:Plasmids; D004718:Saccharomycetales / Q000201:enzymology / Q000235:genetics*; D013045:Species Specificity; D014158:Transcription, Genetic; D001616:beta-Galactosidase / Q000235:genetics*
chemical_list: D004247:DNA; D004262:DNA Restriction Enzymes; D005696:Galactosidases; D001616:beta-Galactosidase