title: Molecular characterization of the gene encoding the DNA gyrase A subunit of Streptococcus pneumoniae.
abstract: The gene encoding the DNA gyrase A subunit of Streptococcus pneumoniae was cloned and sequenced. The gyrA gene codes for a protein of 822 amino acids homologous to the gyrase A subunit of eubacteria. Translation of the gene in an Escherichia coli expression system revealed a 92-kDa polypeptide. A sequence-directed DNA curvature was identified in the promoter region of gyrA. The bend center was mapped and located between the -35 and -10 regions of the promoter. Primer extension analysis showed that gyrA transcription initiates 6 bp downstream of an extended -10 promoter. The possible implications of the bent DNA region as a regulatory element in the transcription of gyrA are discussed.
authors.affiliation: Unidad de Genética Bacteriana (Consejo Superior de Investigaciones Científicas), Centro Nacional de Biología Fundamental, Instituto de Salud Carlos III, 28220 Majadahonda, Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Balas
authors.forename: E
authors.initials: E
authors.lastname: Fernández-Moreira
authors.forename: A G
authors.initials: AG
authors.lastname: De La Campa
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D027081:DNA Gyrase; D004250:DNA Topoisomerases, Type II / Q000737:chemistry / Q000235:genetics*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D011401:Promoter Regions, Genetic / Q000235:genetics; D011993:Recombinant Fusion Proteins; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013296:Streptococcus pneumoniae / Q000201:enzymology / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D011993:Recombinant Fusion Proteins; D027081:DNA Gyrase; D004250:DNA Topoisomerases, Type II