期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 16, 页码 19230-19243出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00907
关键词
magnetic glyconanoparticles; bacterial separation; lectins; RAFT polymerization; grafting to; microbial consortia
资金
- Biotechnology and Biological Sciences Research Council [BB/L013940/1]
- National Biofilms Innovation Center (NBIC), an Innovation and Knowledge Center - Biotechnology and Biological Sciences Research Council
- InnovateUK
- Hartree Center [BB/R012415/1]
- BBSRC [BB/R012415/1, BB/L013940/1] Funding Source: UKRI
A novel strategy combining inducible bacterial lectin expression with magnetic glyconanoparticles was demonstrated to enable selective bacterial isolation from mixed populations, showing promise as a versatile tool for bacteria extraction.
The selective isolation of bacteria from mixed populations has been investigated in varied applications ranging from differential pathogen identification in medical diagnostics and food safety to the monitoring of microbial stress dynamics in industrial bioreactors. Selective isolation techniques are generally limited to the confinement of small populations in defined locations, may be unable to target specific bacteria, or rely on immunomagnetic separation, which is not universally applicable. In this proof-of-concept work, we describe a novel strategy combining inducible bacterial lectin expression with magnetic glyconanoparticles (MGNPs) as a platform technology to enable selective bacterial isolation from cocultures. An inducible mutant of the type 1 fimbriae, displaying the mannose-specific lectin FimH, was constructed in Escherichia coli allowing for on-demand glycan-binding protein presentation following external chemical stimulation. Binding to glycopolymers was only observed upon fimbrial induction and was specific for mannosylated materials. A library of MGNPs was produced via the grafting of well-defined catechol-terminal glycopolymers prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization to magnetic nanoparticles. Thermal analysis revealed high functionalization (>= 85% polymer by weight). Delivery of MGNPs to cocultures of fluorescently labeled bacteria followed by magnetic extraction resulted in efficient depletion of type 1 fimbriated target cells from wild-type or afimbriate E. coli. Extraction efficiency was found to be dependent on the molecular weight of the glycopolymers utilized to engineer the nanoparticles, with MGNPs decorated with shorter Dopa-(ManAA)(50) mannosylated glycopolymers found to perform better than those assembled from a longer Dopa-(ManAA)(200) analogue. The extraction efficiency of fimbriated E. coli was also improved when the counterpart strain did not harbor the genetic apparatus for the expression of the type 1 fimbriae. Overall, this work suggests that the modulation of the genetic apparatus encoding bacterial surface-associated lectins coupled with capture through MGNPs could be a versatile tool for the extraction of bacteria from mixed populations.
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