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ABSTRACT: PROTECTIVE EFFECT OF DRYING ON NEOPORPHYRA HAITANENSIS IN FROZEN STORAGE

PROVIDER: PRJNA839273 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19264471.fastq.gz	Fastqsanger.gz
	SRR19264472.fastq.gz	Fastqsanger.gz
	SRR19264473.fastq.gz	Fastqsanger.gz
	SRR19264474.fastq.gz	Fastqsanger.gz
	SRR19264475.fastq.gz	Fastqsanger.gz

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Contribution of aerobic metabolism and oxidative stress responses to freeze-drying and storage resistance of Lactococcus lactis subsp. lactis TOMSC161 by using post-genomic approaches

Project description:Purpose: Lactococcus lactis is the primary constituent of many industrial starter cultures used in food fermentations. However, this bacterium is exposed to several stressful conditions during the industrial process. L. lactis TOMSC161 has been shown to resist better to freeze-drying and storage when cells are harvested at the late stationary compared to the early stationary phase. Methods: In this work, the physiological changes that occur during growth (early and late stationary phases) were studied using transcriptomic, proteomic and cytometric approaches in order to elucidate the cell mechanisms involved in the stress tolerance of L. lactis TOMSC161 to freeze-drying and storage processes. Results: The majority of altered abundances for genes determined by transcriptomic analysis indicated a slowdown at the late stationary phase in general metabolism and in the incomplete reduction of O2 leading to reactive oxygen species (ROS), in comparison to the early stationary phase. Furthermore, the expression of genes involved in general and oxidative stress responses was over-expressed at the late stationary phase when compared to the early stationary phase, thus explaining the better resistance to freeze-drying and the storage of cells harvested after six hours of stationary phase. Superoxide anion detection was performed by flow cytometry and related to the ROS production of starters. Superoxide anion concentration was lower for cells harvested at the late stationary phase when compared to cells harvested at the early stationary phase. Conclusions: L. lactis TOMSC161 was thus able to develop an oxidative stress “pre-adaptation” during the stationary phase making it possible to better resist freeze-drying and storage stresses and especially oxidative stress.

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