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Valenzuela JA, Vázquez L, Rodríguez J, Flórez AB, Vasek OM, Mayo B. Phenotypic, Technological, Safety, and Genomic Profiles of Gamma-Aminobutyric Acid-Producing Lactococcus lactis and Streptococcus thermophilus Strains Isolated from Cow's Milk. Int J Mol Sci 2024; 25:2328. [PMID: 38397005 PMCID: PMC10889254 DOI: 10.3390/ijms25042328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/09/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024] Open
Abstract
Gamma-aminobutyric acid (GABA)-producing lactic acid bacteria (LAB) can be used as starters in the development of GABA-enriched functional fermented foods. In this work, four GABA-producing strains each of Lactococcus lactis and Streptococcus thermophilus species were isolated from cow's milk, and their phenotypic, technological, and safety profiles determined. Genome analysis provided genetic support for the majority of the analyzed traits, namely, GABA production, growth in milk, and the absence of genes of concern. The operon harboring the glutamate decarboxylase gene (gadB) was chromosomally encoded in all strains and showed the same gene content and gene order as those reported, respectively, for L. lactis and S. thermophilus. In the latter species, the operon was flanked (as in most strains of this species) by complete or truncated copies of insertion sequences (IS), suggesting recent acquisition through horizontal gene transfer. The genomes of three L. lactis and two S. thermophilus strains showed a gene encoding a caseinolytic proteinase (PrtP in L. lactis and PrtS in S. thermophilus). Of these, all but one grew in milk, forming a coagulum of good appearance and an appealing acidic flavor and taste. They also produced GABA in milk supplemented with monosodium glutamate. Two L. lactis strains were identified as belonging to the biovar. diacetylactis, utilized citrate from milk, and produced significant amounts of acetoin. None of the strains showed any noticeable antibiotic resistance, nor did their genomes harbor transferable antibiotic resistance genes or genes involved in toxicity, virulence, or pathogenicity. Altogether these results suggest that all eight strains may be considered candidates for use as starters or components of mixed LAB cultures for the manufacture of GABA-enriched fermented dairy products.
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Affiliation(s)
- José Alejandro Valenzuela
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Spain; (J.A.V.); (L.V.); (J.R.); (A.B.F.)
- Biotecnología Microbiana para la Innovación Alimentaria, Instituto de Modelado e Innovación Tecnológica-Universidad Nacional del Nordeste (CONICET-UNNE), Campus UNNE, Corrientes 3400, Argentina;
| | - Lucía Vázquez
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Spain; (J.A.V.); (L.V.); (J.R.); (A.B.F.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Avenida de Roma s/n, 33011 Oviedo, Spain
| | - Javier Rodríguez
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Spain; (J.A.V.); (L.V.); (J.R.); (A.B.F.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Avenida de Roma s/n, 33011 Oviedo, Spain
| | - Ana Belén Flórez
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Spain; (J.A.V.); (L.V.); (J.R.); (A.B.F.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Avenida de Roma s/n, 33011 Oviedo, Spain
| | - Olga M. Vasek
- Biotecnología Microbiana para la Innovación Alimentaria, Instituto de Modelado e Innovación Tecnológica-Universidad Nacional del Nordeste (CONICET-UNNE), Campus UNNE, Corrientes 3400, Argentina;
| | - Baltasar Mayo
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Spain; (J.A.V.); (L.V.); (J.R.); (A.B.F.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Avenida de Roma s/n, 33011 Oviedo, Spain
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Liu B, Zhong X, Liu Z, Guan X, Wang Q, Qi R, Zhou X, Huang J. Probiotic Potential and Safety Assessment of Lactiplantibacillus plantarum cqf-43 and Whole-Genome Sequence Analysis. Int J Mol Sci 2023; 24:17570. [PMID: 38139398 PMCID: PMC10744225 DOI: 10.3390/ijms242417570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 12/24/2023] Open
Abstract
This study reports the whole-genome sequence of Lactiplantibacillus plantarum cqf-43 isolated from healthy sow feces. Based on genomic analysis, we performed a comprehensive safety assessment of strain cqf-43, using both in vitro and in vivo experiments, and explored its probiotic potential. The total genome length measures 3,169,201 bp, boasting a GC content of 44.59%. Through phylogenetic analyses, leveraging both 16S rRNA gene and whole-genome sequences, we confidently categorize strain cqf-43 as a member of Lactiplantibacillus. Genome annotation using Prokka unveiled a total of 3141 genes, encompassing 2990 protein-coding sequences, 71 tRNAs, 16 rRNAs, and 1 tmRNA. Functional annotations derived from COG and KEGG databases highlighted a significant abundance of genes related to metabolism, with a notable emphasis on carbohydrate utilization. The genome also revealed the presence of prophage regions and CRISPR-Cas regions while lacking virulence and toxin genes. Screening for antibiotic resistance genes via the CARD database yielded no detectable transferable resistance genes, effectively eliminating the potential for harmful gene transfer. It is worth highlighting that the virulence factors identified via the VFDB database primarily contribute to bolstering pathogen resilience in hostile environments. This characteristic is particularly advantageous for probiotics. Furthermore, the genome is devoid of menacing genes such as hemolysin, gelatinase, and biogenic amine-producing genes. Our investigation also unveiled the presence of three unannotated secondary metabolite biosynthetic gene clusters, as detected by the online tool antiSMASH, suggesting a great deal of unknown potential for this strain. Rigorous in vitro experiments confirmed tolerance of strain cqf-43 in the intestinal environment, its antimicrobial efficacy, sensitivity to antibiotics, absence of hemolysis and gelatinase activity, and its inability to produce biogenic amines. In addition, a 28-day oral toxicity test showed that the strain cqf-43 did not pose a health hazard in mice, further establishing it as a safe strain.
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Affiliation(s)
- Baiheng Liu
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- College of Animal Science and Technology, Southwest University, Chongqing 402460, China
| | - Xiaoxia Zhong
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Zhiyun Liu
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Xiaofeng Guan
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Qi Wang
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Renli Qi
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Xiaorong Zhou
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
| | - Jinxiu Huang
- Chongqing Academy of Animal Science, Chongqing 402460, China; (B.L.); (X.Z.); (Z.L.); (X.G.); (Q.W.); (R.Q.); (X.Z.)
- National Pig Technology Innovation Center, Chongqing 402460, China
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