Antimicrobial Agents and Chemotherapy
Biology | Life Sciences
We isolated and characterized mutants of Bartonella bacilliformis that are resistant to the fluoroquinolone antibiotic ciprofloxacin, which targets the A subunit of DNA gyrase. Mutants had single point mutations in the gyrA gene that changed either Asp-90 to Gly or Asp-95 to Asn and had 3- or 16-fold higher resistance, respectively, to ciprofloxacin than did wild-type B. bacilliformis. Asp-95 is homologous to Asp-87 of Escherichia coli GyrA and is a common residue mutated in fluoroquinolone-resistant strains of other bacteria. This is the first report of a mutation at an Asp-90 homologue, which corresponds to Asp-82 in E. coli GyrA.
Minnick, Michael F.; Wilson, Zachary R.; Smitherman, Laura S.; and Samuels, D. Scott, "gyrA Mutations in Ciprofloxacin-Resistant Bartonella Bacilliformis Strains Obtained in Vitro" (2003). Biological Sciences Faculty Publications. 10.