Research progress on the antioxidant mechanism of Listeria monocytogenes
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Abstract:
Listeria monocytogenes, a gram-positive bacterium, causes listeriosis. It is widely distributed in dairy products, meat products, vegetables and fruits, seriously threatening human health. L. monocytogenes possesses a sophisticated antioxidant defense system comprising two distinct components. The enzymatic antioxidant system consists of catalytically active proteins including superoxide dismutase, catalase , and glutathione peroxidase. The non-enzymatic antioxidant system is composed of the thioredoxin system, glutaredoxin system, and various low-molecular-weight antioxidant molecules, which enables it to have strong resistance to the bactericidal disinfectants commonly used in food storage and transportation. This article introduced the main sources of reactive oxygen species in L. monocytogenes, as well as the mechanisms of small molecules, genes, and antioxidant defense system that play a key role in the antioxidant stress process. The comprehensive analysis provides a theoretical framework for advancing food preservation technologies and developing targeted antimicrobial interventions, ultimately contributing to enhanced food safety standards and extended shelf-life stability of perishable commodities.
