title: Directly repeated insertion of 9-nucleotide sequence detected in penicillin-binding protein 2B gene of penicillin-resistant Streptococcus pneumoniae.
abstract: We investigated the molecular mechanism of 50 penicillin-resistant Streptococcus pneumoniae strains (penicillin: MIC, > or = 0.125 microgram/ml) having neither class A nor class B mutations in the penicillin-binding protein 2B gene (pbp2b). An analysis of the nucleotide sequences of the pbp2b genes from seven strains revealed an unique direct repeat of 9 nucleotides (TGGTATACT) between active-site serine (residue 385) and Ser-X-Asn (residues 442 to 444) motifs. The same insertion was detected in 13 strains.
authors.affiliation: Institute for Biotechnology Research, Wakunaga Pharmaceutical Co., Ltd., Hiroshima, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yamane
authors.forename: H
authors.initials: H
authors.lastname: Nakano
authors.forename: Y
authors.initials: Y
authors.lastname: Asahi
authors.forename: K
authors.initials: K
authors.lastname: Ubukata
authors.forename: M
authors.initials: M
authors.lastname: Konno
mesh_terms: D000595:Amino Acid Sequence; D019881:Aminoacyltransferases; D001426:Bacterial Proteins; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics*; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000032:analysis* / Q000302:isolation & purification; D005798:Genes, Bacterial / Q000235:genetics*; D006602:Hexosyltransferases; D008969:Molecular Sequence Data; D002267:Muramoylpentapeptide Carboxypeptidase / Q000235:genetics*; D009154:Mutation; D009693:Nucleic Acid Hybridization; D010403:Penicillin Resistance / Q000235:genetics*; D046915:Penicillin-Binding Proteins; D010458:Peptidyl Transferases; D013296:Streptococcus pneumoniae / Q000187:drug effects / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D046915:Penicillin-Binding Proteins; D019881:Aminoacyltransferases; C478701:penicillin-binding protein 2b, Streptococcus; D010458:Peptidyl Transferases; D006602:Hexosyltransferases; D002267:Muramoylpentapeptide Carboxypeptidase