Novel Variant of New Delhi Metallo-β-lactamase, NDM-20, in Escherichia coli.

Zhihai Liu,Yuebin Ke,Xiaoming Wang,Jianzhong Shen,Dejun Liu,Yang Wang,Jiyun Li

doi:10.3389/fmicb.2018.00248

Abstract

The spread of carbapenem-resistant Enterobacteriaceae (CRE) mediated by New Delhi metallo-β-lactamase (NDM) poses a serious challenge to clinicians and has become a major public health concern. NDM has been evolving into variants that possess different hydrolysis activity toward antibiotics, so as to affect treatment strategy. In addition, very few studies on NDM variants have focused on animal-derived bacterial isolates. Our study reports a novel NDM variant, NDM-20, in an isolate of Escherichia coli CCD1 recovered from the food animal swine in China. The isolate that was assigned to ST1114, exhibited high level resistance to all β-lactams tested, including aztreonam and carbapenems. The gene of blaNDM-20 was located on an IncX3-type plasmid, surrounded by multiple insertion sequences. Sequencing analysis demonstrated that blaNDM-20 contained three point mutations at positions 262 (G→T), 460 (A→C), and 809 (G→A), compared with blaNDM-1, and just one point mutation at position 809 (G→A), relative to blaNDM-5. Functional analysis revealed that the blaNDM-20 transformant, DH5α+pHSG398/NDM-20, exhibited a higher resistance to ertapenem than that of blaNDM-1 transformant DH5α+pHSG398/NDM-1. Kinetic parameter analysis showed that NDM-20 had increased enzymatic activity against some penicillins and cephalosporins but decreased carbapenemase activity relative to NDM-5. The identification of NDM-20 further confirms the evolution and prevalence of NDM variants in bacteria of food-animal origin.

Highlights

The global dissemination of carbapenem-resistant Enterobacteriaceae (CRE) has become a major threat to public health
Homology and phylogenetic analysis of the amino acid sequences of all New Delhi metalloβ-lactamase (NDM) variants showed that NDM-20 shared the closest evolutionary relationship with NDM-5 (Figure 1)
Our study reports a novel NDM variant, NDM-20, in a ST1114 E. coli isolate recovered from food animal in China

Summary

Introduction

The global dissemination of carbapenem-resistant Enterobacteriaceae (CRE) has become a major threat to public health. With the increasing global prevalence of New Delhi metalloβ-lactamase (NDM)-producing bacteria, which are highly disseminated in China (Khan et al, 2017), available antibiotics are becoming less effective in the treatment of drug-resistant bacterial infections. NDMs may be evolving diverse hydrolytic activity toward β-lactams, resulting from amino acid substitutions or insertions (Khan et al, 2017), subsequently, it may affect treatment strategy. These bacteria producing NDM variants are disseminated among humans, and in food animals (Wang et al, 2017). Even though food-producing animals serve as the major reservoir of NDM-producing bacteria (Madec et al, 2017), apart from our previous

Methods

Results

Conclusion