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Langa S, Peirotén A, Gaya P, Garde S, Arqués J, Nuñez M, Medina M, Rodríguez-Mínguez E. Human Bifidobacterium strains as adjunct cultures in Spanish sheep milk cheese. J Dairy Sci 2020; 103:7695-7706. [DOI: 10.3168/jds.2020-18203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 04/26/2020] [Indexed: 02/02/2023]
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Langa S, Arqués JL, Medina M, Landete JM. Coproduction of colicin V and lactic acid bacteria bacteriocins in lactococci and enterococci strains of biotechnological interest. J Appl Microbiol 2017; 122:1159-1167. [PMID: 28261897 DOI: 10.1111/jam.13439] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 02/28/2017] [Accepted: 02/28/2017] [Indexed: 11/27/2022]
Abstract
AIMS The aim of this study was the coproduction in a single strain of the Gram-negative bacteriocin colicin V with other bacteriocins from lactic acid bacteria (LAB). METHODS AND RESULTS Colicin V was expressed in Lactococcus and Enterococcus strains by replacing the colicin V leader peptide by the leader peptide and promoter of d-alanyl-d-alanine carboxypeptidase from Lactobacillus reuteri CECT925 in pNZ8048 (pNZ:LR-colV). The antimicrobial activity of colicin V against the indicator organism Escherichia coli DH5α in transformed strains was checked by agar diffusion assay and SDS-PAGE analysis. CONCLUSIONS Lactococcus and Enterococcus transformed with pNZ:LR-colV were able to coproduce colicin V at high levels together with other LAB bacteriocins such as nisin A, nisin Z, lacticin 481 or enterocins A and B, obtaining broad-spectrum activity strains with large potential applications. SIGNIFICANCE AND IMPACT OF THE STUDY The construction showed in this work could be used for the heterologous expression of other bacteriocins active against Gram-negative bacteria or wide-spectrum bacteriocins from LAB.
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Affiliation(s)
- S Langa
- Departamento de Tecnología de Alimentos, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - J L Arqués
- Departamento de Tecnología de Alimentos, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - M Medina
- Departamento de Tecnología de Alimentos, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - J M Landete
- Departamento de Tecnología de Alimentos, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
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Fernandez L, Marin ML, Langa S, Martin R, Reviriego C, Fernandez A, Olivares M, Xaus J, Rodriguez JM. A Novel Genetic Label for Detection of Specific Probiotic Lactic Acid Bacteria. FOOD SCI TECHNOL INT 2016. [DOI: 10.1177/1082013204043761] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A novel method for genetic labelling of specific lactic acid bacteria strains was developed. The approach implied the transformation of the hosts with a plasmid containing a heterologous DNA fragment. The sequence of a DNA fragment that has been used to label a variety of genetically modified (GM) soya was used to design a forward primer and three reverse primers yielding PCR products recognisable by their sizes. Stability of the recombinant plasmid in the transformed strains was studied by PCR, and the results varied significantly depending on the strain. To test the usefulness of the DNA label to study in vivo properties of probiotic bacteria, such as viability after transit through the digestive tract, mice were orally inoculated with a genetically-labelled Enterococcus faecium strain. Later, their faeces were aseptically collected and the genetically-labelled strain was detected among the colonies that grew on MRS agar.
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Affiliation(s)
| | | | | | | | | | - A. Fernandez
- Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | | | - J. Xaus
- Departamento de Immunología, Puleva Biotech, 18004 Granada, Spain
| | - J. M. Rodriguez
- Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Langa S, Martín-Cabrejas I, Montiel R, Landete J, Medina M, Arqués J. Short communication: Combined antimicrobial activity of reuterin and diacetyl against foodborne pathogens. J Dairy Sci 2014; 97:6116-21. [DOI: 10.3168/jds.2014-8306] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 06/14/2014] [Indexed: 11/19/2022]
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Montiel R, Martín-Cabrejas I, Langa S, El Aouad N, Arqués JL, Reyes F, Medina M. Antimicrobial activity of reuterin produced by Lactobacillus reuteri on Listeria monocytogenes in cold-smoked salmon. Food Microbiol 2014; 44:1-5. [PMID: 25084638 DOI: 10.1016/j.fm.2014.05.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 05/09/2014] [Accepted: 05/14/2014] [Indexed: 11/16/2022]
Abstract
Lactobacillus reuteri INIA P579 was used for the production and purification of reuterin. The purity of reuterin was assessed by high resolution electrospray ionization mass spectrometry (HRESIMS) and nuclear magnetic resonance (NMR) spectroscopy. After purification, reuterin concentration obtained was 1.3 M. The inhibitory activity using Escherichia coli K12 as indicator strain was estimated to be 510 AU/ml. Survival curves in tryptic soy broth revealed that reuterin required to inhibit the growth of three Listeria monocytogenes strains was in the range of 2-4 AU/ml. Purified reuterin (10 AU/g) significantly reduced the growth of L. monocytogenes in cold-smoked salmon kept under moderate or strong temperature abuse conditions. After 15 d at 8 °C, cold-smoked salmon with added reuterin exhibited L. monocytogenes counts 2.0 log CFU/g lower than control smoked salmon with no reuterin added. At 30 °C, reuterin also controlled the growth of the pathogen, with counts 1.4 and 0.9 log CFU/g lower than those observed in control smoked salmon after 24 and 48 h, respectively. The addition of purified reuterin might be used as a hurdle technology to improve the safety and extend the shelf-life of lightly preserved seafood products such as cold-smoked salmon.
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Affiliation(s)
- R Montiel
- Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, Madrid 28040, Spain
| | - I Martín-Cabrejas
- Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, Madrid 28040, Spain
| | - S Langa
- Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, Madrid 28040, Spain
| | - N El Aouad
- Fundación MEDINA, Avenida del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, Granada 18016, Spain
| | - J L Arqués
- Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, Madrid 28040, Spain
| | - F Reyes
- Fundación MEDINA, Avenida del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, Granada 18016, Spain
| | - M Medina
- Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, Madrid 28040, Spain.
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Fernández L, Langa S, Martín V, Jiménez E, Martín R, Rodríguez JM. The microbiota of human milk in healthy women. Cell Mol Biol (Noisy-le-grand) 2013; 59:31-42. [PMID: 24200019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 09/17/2012] [Indexed: 06/02/2023]
Abstract
Recent work has shown that human colostrum and milk, which had been traditionally considered sterile, provides a continuous supply of commensal and potential probiotic bacteria to the infant gut. More than 200 different bacterial species, including staphylococci, lactic acid bacteria and bifidobacteria, have been isolated from human milk samples so far, although the cultivable bacterial diversity found in individual samples is much lower (2 to 8 different species per women). Interestingly, the same bacterial strains have been found in both breast milk and infant feces of different mother-infant pairs, confirming the role of human milk on the bacterial colonization of the infant gut. These commensal bacteria could protect the infant gut and direct, at least partly, the maturation of the immune system, among other functions. Different studies suggest that some bacteria present in the maternal gut could reach the mammary gland during late pregnancy and lactation through a mechanism involving gut dendritic cells and macrophages. Thus, modulation of maternal gut microbiota during pregnancy and lactation could have a direct effect on infant health.
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Affiliation(s)
- L Fernández
- Complutense University of Madrid Department of Nutrition, Food Science and Food Technology Madrid Spain
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Stevens-Kalceff M, Langa S, Tiginyanu I, Carstensen J, Christophersen M, Föll H. Comparative SEM and Cathodoluminescence Microanalysis of Porous GaP Structures. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-638-f5.31.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractElectron microscopy and cathodoluminescence (CL) microanalysis were used for a comparative study of porous layers fabricated by electrochemical etching of n-GaP substrates in a sulfuric acid solution. Both the CL and morphology of porous layers were found to depend upon the anodic current density. At high current density (100 mA/cm2) anodization leads to the formation of so-called current-line oriented pores and an increase in the CL intensity. We observed self-induced voltage oscillations giving rise to a synchronous modulation of the diameter of pores and CL intensity. When the current density decreased to values as low as 1 mA/cm2 the pores began to grow along <111> crystallographic directions and the CL intensity was observed to be lower than that of bulk GaP.
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Carstensen J, Christophersen M, Lölkes S, Ossei-Wusu E, Bahr J, Langa S, Popkirov G, Föll H. Large area etching for porous semiconductors. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssc.200461159] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Langa S, Fernández A, Martín R, Reviriego C, Marín ML, Fernández L, Rodríguez JM. Differentiation of Enterococcus faecium from Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus strains by PCR and dot-blot hybridisation. Int J Food Microbiol 2004; 88:197-200. [PMID: 14596990 DOI: 10.1016/s0168-1605(03)00180-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Variations in length and sequence of the 16S/23S spacer region of Enterococcus faecium provided the basis for development of simple PCR and dot-blot hybridisation assays that enabled the differentiation of potentially probiotic Enterococcus faecium strains from Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus. Such assays may be useful for differentiation of yoghurt starter cultures and enterococcal strains when they are simultaneously present in probiotic food products.
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Affiliation(s)
- S Langa
- Departamento de Nutrición y Bromatología III, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Langa S, Christophersen M, Carstensen J, Tiginyanu IM, Föll H. Single crystalline 2D porous arrays obtained by self organization in n-InP. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssa.200306471] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Tiginyanu IM, Kravetsky IV, Langa S, Marowsky G, Monecke J, Föll H. Porous III–V compounds as nonlinear optical materials. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssa.200306567] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Christophersen M, Langa S, Carstensen J, Tiginyanu IM, Föll H. A comparison of pores in silicon and pores in III–V compound materials. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssa.200306499] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Föll H, Carstensen J, Langa S, Christophersen M, Tiginyanu IM. Porous III–V compound semiconductors: formation, properties, and comparison to silicon. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pssa.200306469] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Langa S, Carstensen J, Tiginyanu IM, Christophersen M, Föll H. Self-Induced Voltage Oscillations during Anodic Etching of n-InP and Possible Applications for Three-Dimensional Microstructures. ACTA ACUST UNITED AC 2001. [DOI: 10.1149/1.1370417] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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