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ABSTRACT: biofilm attached to the leaves of submerged macrophytes under trace PAHs stress

PROVIDER: PRJNA418665 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6296460.fastq.gz	Fastqsanger.gz
	SRR6296461.fastq.gz	Fastqsanger.gz
	SRR6296462.fastq.gz	Fastqsanger.gz
	SRR6296463.fastq.gz	Fastqsanger.gz
	SRR6296464.fastq.gz	Fastqsanger.gz

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Project description:The ability of Staphylococcus aureus to establish strong biofilms in milk poses a significant threat to the consumer’s health and a challenge for the dairy industry. Here, we have evaluated the efficacy of phage-based treatments (phage Kayvirus rodi and lytic protein LysRODI∆Ami) for combating biofilm formation on polystyrene and stainless steel surfaces submerged in UHT skim milk compared to growth medium. An adaptive transcriptional response was observed in cells intended to metabolize lactose and to increase biofilm formation. Also, biofilms grown in milk exhibited a denser and more complex matrix, mainly composed of proteins, presumably casein. These changes in matrix composition and structure offered a high resistance to both LysRODI∆Ami (4 µM) and phage Kayvirus rodi (108 PFU/ml) individual treatments, although combination of the two led to some reduction in the number of attached cells. Both antimicrobials were more successful at biofilm inhibition, exhibiting a synergistic interaction when used together. Unexpectedly, the bacteriophage treatment exhibited enhanced efficacy to prevent biofilm development in milk compared to fresh medium. The shift in matrix composition and pH modulation might be behind these differences. This research contributes to the development of innovative strategies for ensuring milk quality and safety. Moreover, our results demonstrate the importance of testing antimicrobials under conditions that reflect the real-life application as much as possible.

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Project description:Bacillus subtilis has been extensively used as a model for molecular studies on biofilm formation. These studies encompassed the development of complex macro-colonies on agar, the formation of pellicles at the air-liquid interface, and lately the formation of submerged architectural biofilms at the solid-liquid interface. Beside similarities, these multicellular communities also display considerable heterogeneity at the structural, chemical and biological levels. Here we use RNA-seq to analyze nine different spatio-physiological conditions, including the three biofilm populations (colony, pellicle, and submerged).

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