A Novel Transferable Resistance-Nodulation-Division Pump Gene Cluster, tmexCD2-toprJ2 , Confers Tigecycline Resistance in Raoultella ornithinolytica

Abstract
We recently identified a novel plasmid-mediated resistance-nodulation-division (RND)-type efflux pump gene cluster, tmexCD1-toprJ1 , in Klebsiella pneumoniae that conferred resistance to multiple antimicrobials, including tigecycline. While homologs of tmexCD1-toprJ1 were found encoded in many other bacterial species in GenBank, their functions and transfer mechanisms remain unknown.
Funding Information
  • National Natural Science Foundation of China (31625026)
  • National Natural Science Foundation of China (32002338)