title: Mutations in ponA, the gene encoding penicillin-binding protein 1, and a novel locus, penC, are required for high-level chromosomally mediated penicillin resistance in Neisseria gonorrhoeae.
abstract: Chromosomally mediated penicillin resistance in Neisseria gonorrhoeae occurs in part through alterations in penicillin-binding proteins (PBPs) and a decrease in outer membrane permeability. However, the genetic and molecular mechanisms of transformation of a penicillin-susceptible strain of N. gonorrhoeae to high-level penicillin resistance have not been clearly elucidated. Previous studies suggested that alterations in PBP 1 were involved in high-level penicillin resistance. In this study, we identified a single amino acid mutation in PBP 1 located 40 amino acids N terminal to the active-site serine residue that was present in all chromosomally mediated resistant N. gonorrhoeae (CMRNG) strains for which MICs of penicillin were > or = 1 microg/ml. PBP 1 harboring this point mutation (PBP 1*) had a three- to fourfold lower rate of acylation (k2/K') than wild-type PBP 1 with a variety of beta-lactam antibiotics. Consistent with its involvement in high-level penicillin resistance, replacement of the altered ponA gene (ponA1) in several CMRNG strains with the wild-type ponA gene resulted in a twofold decrease in the MICs of penicillin. Surprisingly, transformation of an intermediate-level penicillin-resistant strain (PR100; FA19 penA4 mtr penB5) with the ponA1 gene did not increase the MIC of penicillin for this strain. However, we identified an additional resistance locus, termed penC, which was required along with ponA1 to increase penicillin resistance of PR100 to a high level (MIC = 4 microg/ml). The penC locus by itself, when present in PR100, increases the MICs of penicillin and tetracycline twofold each. These data indicate that an additional locus, penC, is required along with ponA1 to achieve high-level penicillin resistance.
authors.affiliation: Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7365, USA.
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Ropp
authors.forename: Mei
authors.initials: M
authors.lastname: Hu
authors.forename: Melanie
authors.initials: M
authors.lastname: Olesky
authors.forename: Robert A
authors.initials: RA
authors.lastname: Nicholas
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001426:Bacterial Proteins; D002352:Carrier Proteins / Q000235:genetics* / Q000302:isolation & purification; D002876:Chromosomes, Bacterial / Q000235:genetics*; D003470:Culture Media; D004269:DNA, Bacterial / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics*; D006602:Hexosyltransferases; D007700:Kinetics; D007769:Lactams; D002267:Muramoylpentapeptide Carboxypeptidase / Q000235:genetics* / Q000302:isolation & purification; D009154:Mutation / Q000235:genetics*; D009344:Neisseria gonorrhoeae / Q000187:drug effects* / Q000235:genetics*; D010403:Penicillin Resistance / Q000235:genetics*; D046915:Penicillin-Binding Proteins; D010406:Penicillins / Q000494:pharmacology*; D010458:Peptidyl Transferases; D010957:Plasmids / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification; D014170:Transformation, Genetic / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D002352:Carrier Proteins; D003470:Culture Media; D004269:DNA, Bacterial; D007769:Lactams; D046915:Penicillin-Binding Proteins; D010406:Penicillins; D011994:Recombinant Proteins; D010458:Peptidyl Transferases; D006602:Hexosyltransferases; D002267:Muramoylpentapeptide Carboxypeptidase