title: Ser-127-to-Leu substitution in the DNA gyrase B subunit of Streptococcus pneumoniae is implicated in novobiocin resistance.
abstract: We report the cloning of the gyrB gene from Streptococcus pneumoniae 533 that carries the nov-1 allele. The gyrB gene codes for a protein homologous to the gyrase B subunit of archaebacteria and eubacteria. The same amino acid substitution (Ser-127 to Leu) confers novobiocin resistance on four isolates of S. pneumoniae. This amino acid position is equivalent to Val-120 of Escherichia coli GyrB, a residue that lies inside the ATP-binding domain as revealed by the crystal structure of the protein.
authors.affiliation: Unidad de Genética Bacteriana, Instituto de Salud Carlos III, Majadahonda, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Muñoz
authors.forename: M
authors.initials: M
authors.lastname: Bustamante
authors.forename: A G
authors.initials: AG
authors.lastname: de la Campa
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004250:DNA Topoisomerases, Type II / Q000235:genetics*; D004352:Drug Resistance, Microbial / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics; D007930:Leucine / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D009675:Novobiocin / Q000494:pharmacology*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012694:Serine / Q000235:genetics; D013296:Streptococcus pneumoniae / Q000201:enzymology / Q000235:genetics*
chemical_list: D009675:Novobiocin; D012694:Serine; D004250:DNA Topoisomerases, Type II; D007930:Leucine