Biofilm-mediated biodegradation of hydrophobic organic compounds in the presence of metals as co-contaminants

Yesankar, Prerna J.; Qureshi, Asifa; Purohit, Hemant J.

doi:10.1016/b978-0-323-85455-9.00025-4

Cited by 5 publications

(1 citation statement)

References 108 publications

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“…For biofilm recognition and attachment, we chose not to target EPS protecting biofilm-dwelling bacteria since EPS structure and components are highly variable and significantly influenced by surrounding conditions (e.g., temperature, oxygen, chemical pollutants, and nutrient availability) and biological factors (e.g., cell type, cell growth stage, and biofilm formation stage). − Rather, we targeted P. aeruginosa, a common opportunistic pathogen prevalent in DWDS, − which dominated this dual-species biofilm (and other multi-species biofilms in diverse environments) − because it has a relatively stable cell surface structure compared to the biofilm EPS.…”

Section: Resultsmentioning

confidence: 99%

Biofilm Control in Flow-Through Systems Using Polyvalent Phages Delivered by Peptide-Modified M13 Coliphages with Enhanced Polysaccharide Affinity

Sun

Zuo

et al. 2022

Environ. Sci. Technol.

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Eradication of biofilms that may harbor pathogens in water distribution systems is an elusive goal due to limited penetration of residual disinfectants. Here, we explore the use of engineered filamentous coliphage M13 for enhanced biofilm affinity and precise delivery of lytic polyvalent phages (i.e., broad-host-range phages lysing multiple host strains after infection). To promote biofilm attachment, we modified the M13 major coat protein (pVIII) by inserting a peptide sequence with high affinity for Pseudomonas aeruginosa (P. aeruginosa) extracellular polysaccharides (commonly present on the surface of biofilms in natural and engineered systems). Additionally, we engineered the M13 tail fiber protein (pIII) to contain a peptide sequence capable of binding a specific polyvalent lytic phage. The modified M13 had 102- and 5-fold higher affinity for P. aeruginosa-dominated mixed-species biofilms than wildtype M13 and unconjugated polyvalent phage, respectively. When applied to a simulated water distribution system, the resulting phage conjugates achieved targeted phage delivery to the biofilm and were more effective than polyvalent phages alone in reducing live bacterial biomass (84 vs 34%) and biofilm surface coverage (81 vs 22%). Biofilm regrowth was also mitigated as high phage concentrations induced residual bacteria to downregulate genes associated with quorum sensing and extracellular polymeric substance secretion. Overall, we demonstrate that engineered M13 can enable more accurate delivery of polyvalent phages to biofilms in flow-through systems for enhanced biofilm control.

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