Genome-Driven Insights into Lactococcus sp. KTH0-1S Highlights Its Biotechnological Potential as a Cell Factory

Area of Science:

• Microbiology and Biotechnology
• Food Science and Technology
• Genomics and Bioinformatics

Background:

• The exploration of novel microbial strains is crucial for advancing probiotic applications and developing efficient microbial cell factories.
• Traditional microbial strains may have limitations in safety, stability, or functional capabilities for industrial use.

Purpose of the Study:

• To evaluate the safety, genetic uniqueness, and functional potential of Lactococcus sp. KTH0-1S as a next-generation probiotic and microbial cell factory.
• To characterize the genomic and phenotypic traits of Lactococcus sp. KTH0-1S for its suitability in food-grade applications and biotechnological production.

Main Methods:

• Whole-genome sequencing and multilocus sequence typing (MLST) for genetic analysis.
• In silico safety assessments to identify antimicrobial resistance genes and virulence factors.
• Genomic analysis of genes related to probiotic functions, stress tolerance, adhesion, and metabolism.
• Phenotypic assays to confirm metabolic capabilities and functional traits.

Main Results:

• Lactococcus sp. KTH0-1S was identified as a novel and genetically distinct strain.
• In silico safety evaluations confirmed the absence of major virulence factors and antimicrobial resistance genes.
• The strain possesses genes for stress tolerance, adhesion, biofilm formation, and nutrient acquisition, suitable for gastrointestinal and fermentation environments.
• A chromosomally encoded nisin Z biosynthesis gene cluster with auto-induction was identified, offering a stable alternative to plasmid-based systems.
• Functional respiration metabolism activated by heme supplementation was confirmed, enhancing biomass yield.
• Diverse carbohydrate-active enzymes (CAZymes) enable the utilization of various agro-industrial residues.

Conclusions:

• Lactococcus sp. KTH0-1S is a safe, genetically distinct, and functionally versatile strain with significant potential for probiotic applications.
• Its robust metabolic capabilities and stable nisin production make it a promising candidate for a microbial cell factory in food-grade biotechnological production.
• The strain's ability to utilize agro-industrial residues offers a sustainable approach for cost-effective production.