Emeline Roux

Emeline Roux
Université de Rennes 1 | UR1 · UFR Sciences de la Vie et de l'Environnement

PhD

About

23
Publications
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Introduction
As a researcher, Emeline Roux works at the NuMeCan Institute (Nutrition Metabolism and Cancer) in Rennes, in collaboration with the Genscale INRIA/IRISA team on the characterization of the microbiota with the Oxford Nanopore (MinION) technology (metagenome reconstruction, metabolic pathways, ...). Emeline conducts research in the fields of biochemistry, biotechnology, bioinformatics and microbiology.

Publications

Publications (23)
Article
Full-text available
Background Streptococcus thermophilus is a Gram-positive bacterium widely used as starter in the dairy industry as well as in many traditional fermented products. In addition to its technological importance, it has also gained interest in recent years as beneficial bacterium due to human health-promoting functionalities. The objective of this study...
Article
This study aimed to provide efficient recognition of bacterial strains on personal computers from MinION (Nanopore) long read data. Thanks to the fall in sequencing costs, the identification of bacteria can now proceed by whole genome sequencing. MinION is a fast, but highly error-prone sequencing device and it is a challenge to successfully identi...
Article
Full-text available
Growth of the lactic acid bacterium Streptococcus thermophilus in milk depends on its capacity to hydrolyze proteins of this medium through its surface proteolytic activity. Thus, strains exhibiting the cell envelope proteinase (CEP) PrtS are able to grow in milk at high cellular density. Due to its LPNTG motif, which is possibly the substrate of t...
Preprint
Full-text available
Background Streptococcus thermophilus is a Gram-positive bacterium widely used as starter in the dairy industry as well as in many traditional fermented products. In addition to its technological importance, it has also gained interest in recent years as beneficial bacterium due to human health-promoting functionalities. The objective of this study...
Article
Full-text available
Despite promising health effects, the probiotic status of Streptococcus thermophilus, a lactic acid bacterium widely used in dairy industry, requires further documentation of its physiological status during human gastrointestinal passage. This study aimed to apply recombinant-based in vivo technology (R-IVET) to identify genes triggered in a S. the...
Article
Full-text available
The frequency of infections due to Streptococcus pyogenes M/ emm 89 strains is increasing, presumably due to the emergence of a genetically distinct clone. We sequenced two emm 89 strains isolated in Brittany, France, in 2009 and 2010 from invasive and noninvasive infections, respectively. Both strains belong to a newly emerged emm 89 clade 3 clone...
Article
Full-text available
In this study, Streptococcus macedonicus (S. macedonicus) strains were identified from Algerian traditional fermented milks (Lben and Rayeb). Important prerequisites of probiotic interest such as acidity, bile salts tolerance, and adhesion ability to epithelial cells were investigated. A combination of phenotypic (ability to grow on Bile Esculin Az...
Article
Full-text available
Streptococcus thermophilus (ST) is a lactic acid bacterium widely used in dairy industry and displays several properties which could be beneficial for host. The objective of this study was to investigate, in vitro, the implication of sortase A (SrtA) and sortase-dependent proteins (SDPs) in the adhesion of ST LMD-9 strain to intestinal epithelial c...
Article
In silico analysis of the genome of Streptococcus thermophilus LMD-9 revealed that this strain has a potential new peptide/nickel ABC transporter. We named this system OTS for Oligopeptide Transporter of S. thermophilus. It is composed of a peptide/nickel binding protein OtsA, two permeases OtsB and OtsC and a double ATPase OtsD. This system was pr...
Article
In spite of its contribution to health benefits of yogurt, probiotic properties of Streptococcus thermophilus remain less explored. Hence, we evaluated the capacities of 30 strains of different origins, to resist the stresses prevailing in digestive tracts, of adhering to the mucus producing HT29-MTX cells, as well as their anti-inflammatory proper...
Article
Milk proteins contain numerous potential bioactive peptides, which may be released by digestive proteases or by the proteolytic system of lactic acid bacteria during food processing. The capacity of Streptococcus thermophilus to generate peptides, especially bioactive peptides, from bovine caseins was investigated. Strains expressing various levels...
Article
The interfacial behavior of oleosins, the most abundant proteins from seeds oil bodies, was investigated using the pendant drop method at water/oil interfaces and compared to the behavior of beta-casein and lysozyme, proteins with contrasted emulsifying properties. Recombined high (rS3) and low (rS4) molecular weight oleosins comprising N-terminal...
Article
Full-text available
Yarrowia lipolytica contains five acyl-coenzyme A oxidases (Aox), encoded by the POX1 to POX5 genes, that catalyze the limiting step of peroxisomal β-oxidation. In this study, we analyzed morphological changes of Y. lipolytica growing in an oleic acid medium and the effect of POX deletions on lipid accumulation. Protrusions involved in the uptake o...
Article
Till now, only scattered data are available in the literature, which describes the protein content of plant oil bodies. Especially, the proteins closely associated with the model plant Arabidopsis thaliana oil bodies have never been previously purified and characterized. Oil bodies have been purified using flotation techniques, combined with incuba...
Article
Full-text available
Plants submitted to desiccation store lipids in bodies of spherical shapes: oleosoms. These are composed of a core of triacylglycerols surrounded by a single layer of phospholipids (PLs) in which are embedded proteins of low molecular weight, mostly oleosins. These proteins comprise three domains: amphiphilic N- and C- terminal and an hydrophobic c...
Article
Full-text available
Chez les espèces végétales soumises à dessiccation, les réserves lipidiques des graines sont stockées sous forme de globules, les oléosomes. Ces oléosomes sont composés d'un cœur de triglycérides (TGs), entouré d'une monocouche de phospholipides (PLs) dans laquelle s'insèrent de petites protéines, majoritairement des oléosines. Ces protéines sont c...
Article
A previous study showed that Maillard reaction products (MRP) derived from equimolar glucose or fructose and l-cysteine model solutions (1 M) were potent inhibitors of polyphenoloxidase (PPO) from apple. In the present paper, a kinetic study was undertaken of the behaviour of a Michaelis–Menten PPO-catalyzed reaction in the presence of MRP heated a...
Article
To demonstrate whether caramelization products (CP) and Maillard reaction products (MRP) could inhibit enzymatic browning and/or inactivate apple polyphenoloxidase (PPO), l-cysteine, d-glucose, d-fructose aqueous solutions and equimolar mixtures (1 M) of hexose/cysteine were each tested on purified enzyme activity, using both spectrophotometric and...

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Projects

Projects (3)
Project
We aim to identify bacterial strains of S. thermophilus. This project is a collaboration between 3 research group: Calbinotox (Lorraine University), UMR STLO (INRA/Agrocampus) and Genscale team (INRIA/IRISA). Microbiology, Bioinformatics.