Frontiers in Microbiology (Aug 2020)

Characterization of a Novel Chromosomal Class C β-Lactamase, YOC-1, and Comparative Genomics Analysis of a Multidrug Resistance Plasmid in Yokenella regensburgei W13

  • Danying Zhou,
  • Danying Zhou,
  • Danying Zhou,
  • Zhewei Sun,
  • Zhewei Sun,
  • Junwan Lu,
  • Junwan Lu,
  • Hongmao Liu,
  • Hongmao Liu,
  • Wei Lu,
  • Wei Lu,
  • Hailong Lin,
  • Hailong Lin,
  • Hailong Lin,
  • Xueya Zhang,
  • Xueya Zhang,
  • Xueya Zhang,
  • Qiaoling Li,
  • Qiaoling Li,
  • Qiaoling Li,
  • Wangxiao Zhou,
  • Wangxiao Zhou,
  • Xinyi Zhu,
  • Xinyi Zhu,
  • Haili Xu,
  • Xi Lin,
  • Xi Lin,
  • Hailin Zhang,
  • Hailin Zhang,
  • Teng Xu,
  • Kewei Li,
  • Kewei Li,
  • Qiyu Bao,
  • Qiyu Bao,
  • Qiyu Bao

DOI
https://doi.org/10.3389/fmicb.2020.02021
Journal volume & issue
Vol. 11

Abstract

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Yokenella regensburgei, a member of the family Enterobacteriaceae, is usually isolated from environmental samples and generally resistant to early generations of cephalosporins. To characterize the resistance mechanism of Y. regensburgei strain W13 isolated from the sewage of an animal farm, whole genome sequencing, comparative genomics analysis and molecular cloning were performed. The results showed that a novel chromosomally encoded class C β-lactamase gene with the ability to confer resistance to β-lactam antibiotics, designated blaYOC–1, was identified in the genome of Y. regensburgei W13. Kinetic analysis revealed that the β-lactamase YOC-1 has a broad spectrum of substrates, including penicillins, cefazolin, cefoxitin and cefotaxime. The two functionally characterized β-lactamases with the highest amino acid identities to YOC-1 were CDA-1 (71.69%) and CMY-2 (70.65%). The genetic context of the blaYOC–1-ampR-encoding region was unique compared with the sequences in the NCBI nucleotide database. The plasmid pRYW13-125 of Y. regensburgei W13 harbored 11 resistance genes (blaOXA–10, blaLAP–2, dfrA14, tetA, tetR, cmlA5, floR, sul2, ant(3″)-IIa, arr-2 and qnrS1) within an ∼34 kb multidrug resistance region; these genes were all related to mobile genetic elements. The multidrug resistance region of pYRW13-125 shared the highest identities with those of two plasmids from clinical Klebsiella pneumoniae isolates, indicating the possibility of horizontal transfer of these resistance genes between bacteria of various origins.

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