Balancing mcr-1 expression and bacterial survival is a delicate equilibrium between essential cellular defence mechanisms.

Abstract:

:MCR-1 is a lipid A modifying enzyme that confers resistance to the antibiotic colistin. Here, we analyse the impact of MCR-1 expression on E. coli morphology, fitness, competitiveness, immune stimulation and virulence. Increased expression of mcr-1 results in decreased growth rate, cell viability, competitive ability and significant degradation in cell membrane and cytoplasmic structures, compared to expression of catalytically inactive MCR-1 (E246A) or MCR-1 soluble component. Lipopolysaccharide (LPS) extracted from mcr-1 strains induces lower production of IL-6 and TNF, when compared to control LPS. Compared to their parent strains, high-level colistin resistance mutants (HLCRMs) show reduced fitness (relative fitness is 0.41-0.78) and highly attenuated virulence in a Galleria mellonella infection model. Furthermore, HLCRMs are more susceptible to most antibiotics than their respective parent strains. Our results show that the bacterium is challenged to find a delicate equilibrium between expression of MCR-1-mediated colistin resistance and minimalizing toxicity and thus ensuring cell survival.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yang Q,Li M,Spiller OB,Andrey DO,Hinchliffe P,Li H,MacLean C,Niumsup P,Powell L,Pritchard M,Papkou A,Shen Y,Portal E,Sands K,Spencer J,Tansawai U,Thomas D,Wang S,Wang Y,Shen J,Walsh T

doi

10.1038/s41467-017-02149-0

subject

Has Abstract

pub_date

2017-12-12 00:00:00

pages

2054

issue

1

issn

2041-1723

pii

10.1038/s41467-017-02149-0

journal_volume

8

pub_type

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