Influence of Two-Dimensional Black Phosphorus on the Horizontal Transfer of Plasmid-Mediated Antibiotic Resistance Genes: Promotion or Inhibition?

Overview

Journal Curr Microbiol

Specialty Microbiology

Date 2024 Sep 5

PMID 39235595

Authors

Rongrong Xu

Chuang Huang

Bo Yang

Shengli Wang

Tianyang Zhong

Lulu Ma

Qiannan Shang

Mengyao Zhang

Zhuding Chu

Xiaowei Liu

Affiliations

Soon will be listed here.

Abstract

The problem of bacterial resistance caused by antibiotic abuse is seriously detrimental to global human health and ecosystem security. The two-dimensional nanomaterial (2D) such as black phosphorus (BP) is recently expected to become a new bacterial inhibitor and has been widely used in the antibacterial field due to its specific physicochemical properties. Nevertheless, the effects of 2D-BP on the propagation of antibiotic resistance genes (ARGs) in environments and the relevant mechanisms are not clear. Herein, we observed that the sub-inhibitory concentrations of 2D-BP dramatically increased the conjugative transfer of ARGs mediated by the RP4 plasmid up to 2.6-fold at the 125 mg/L exposure level compared with the untreated bacterial cells. Nevertheless, 2D-BP with the inhibitory concentration caused a dramatic decrease in the conjugative frequency. The phenotypic changes revealed that the increase of the conjugative transfer caused by 2D-BP exposure were attributed to the excessive reactive oxygen species and oxidative stress, and increased bacterial cell membrane permeability. The genotypic evidence demonstrated that 2D-BP affecting the horizontal gene transfer of ARGs was probably through the upregulation of mating pair formation genes (trbBp and traF) and DNA transfer and replication genes (trfAp and traJ), as well as the downregulation of global regulatory gene expression (korA, korB, and trbA). In summary, the changes in the functional and regulatory genes in the conjugative transfer contributed to the stimulation of conjugative transfer. This research aims to broaden our comprehension of how nanomaterials influence the dissemination of ARGs by elucidating their effects and mechanisms.

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