A5073807970- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Genomics and Phylogenetic Studies
- Legume Nitrogen Fixing Symbiosis
- Probiotics and Fermented Foods
- Plant nutrient uptake and metabolism
- Microbial Natural Products and Biosynthesis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Algal biology and biofuel production
- Biocrusts and Microbial Ecology
- Marine and coastal ecosystems
- Plant Virus Research Studies
- Marine Sponges and Natural Products
- Mosquito-borne diseases and control
- Viral Infectious Diseases and Gene Expression in Insects
- Agriculture Sustainability and Environmental Impact
- thermodynamics and calorimetric analyses
- bioluminescence and chemiluminescence research
- Helicobacter pylori-related gastroenterology studies
- Agronomic Practices and Intercropping Systems
- Animal Virus Infections Studies
- Polar Research and Ecology
- Microbial Metabolites in Food Biotechnology
- Bacterial biofilms and quorum sensing
- Aquaculture disease management and microbiota
Université de Montpellier
2018-2025
Molécules de Communication et Adaptation des Micro-organismes
2013-2020
Centre de Gestion Scientifique
2020
Centre National de la Recherche Scientifique
2004-2020
Laboratoire des Symbioses Tropicales et Méditerranéennes
2018-2020
Centre de Coopération Internationale en Recherche Agronomique pour le Développement
2018-2020
Institut de Recherche pour le Développement
2018-2020
Institut Agro Montpellier
2018
Sorbonne Université
2015-2017
Muséum national d'Histoire naturelle
2014
Microcystis aeruginosa is a planktonic unicellular cyanobacterium often responsible for seasonal mass occurrences at the surface of freshwater environments. An abundant production intracellular structures, gas vesicles, provides cells with buoyancy. A 8.7-kb gene cluster that comprises twelve genes involved in vesicle synthesis was identified. Ten these are organized two operons, gvpA(I)A(II)A(III)CNJX and gvpKFG, two, gvpV gvpW, individually expressed. In an attempt to elucidate basis...
Selected strains of filamentous Phormidium-like cyanobacteria isolated from two Arctic regions (Ellesmere Island, High Canadian and Svalbard) Antarctica (Antarctic peninsula, South Shetland Islands Orkney Islands) were studied. The polyphasic approach used included phenotypic observations morphological features genotypic analyses (restriction fragment length polymorphism 16S rRNA gene, internal transcribed space, gene sequence analysis). Although genotypes generally correspond to observed...
Actinorhizal plants are able to establish a symbiotic relationship with Frankia bacteria leading the formation of root nodules. The interaction starts exchange signals in soil between plant and bacteria. This molecular dialogue involves signaling molecules that responsible for specific recognition host its endosymbiont. Here we studied two factors potentially involved casuarinae actinorhizal Casuarina glauca: (1) Root Hair Deforming Factor (CgRHDF) detected using test based on characteristic...
In Gram-negative bacteria, resistance-nodulation-division-type efflux pumps, particularly AcrAB-TolC, play a critical role in mediating resistance to antimicrobial agents and toxic metabolites, contributing multidrug resistance. Photorhabdus laumondii is an entomopathogenic bacterium that has garnered significant interest due its production of bioactive specialized metabolites with anti-inflammatory, antimicrobial, scavenger deterrents properties. previous work, we demonstrated AcrAB confers...
Xenorhabdus is an entomopathogenic bacterium involved in a mutualistic relationship with Steinernema nematodes. produces multitude of specialized metabolites by Non-Ribosomal Peptide Synthetases (NRPSs) pathways to mediate bacterial–nematode–insect interactions. PAX cyclolipopeptides are family NRP-type molecules whose ecological role remains poorly understood. In this study, the pleiotropic peptides life cycle nematophila has been investigated. By mass spectrometry analysis, we first...
Ref(2)P has been described as one of the Drosophila proteins that interacts with sigma virus cycle. We generated alleles to identify critical residues involved in restrictive (inhibiting viral multiplication) or permissive (allowing character Ref(2)P. demonstrate increase ability infect when compared null and we confirm decrease this capacity. Moreover, have created unfunctional cycling while functional for fly functions. This type allele had never observed before shows fly- virus-related...
A bacteriocin-producing bacterium was isolated from boza and identified as Leuconostoc pseudomesenteroides KM432Bz. The antimicrobial peptide purified shown to be identical other class IIa bacteriocins: leucocin gelidum UAL-187 QU15 B carnosum Ta11a. bacteriocin named B-KM432Bz. Leucocin B-KM432Bz gene cluster encodes the precursor (lcnB), immunity protein (lcnI) dedicated export machinery (lcnD lcnE). of unknown non-essential function (lcnC), which is interrupted by an insertion sequence...
The diversity of the cultivable microbiota marine sponge Phorbas tenacior frequently found in Mediterranean Sea was investigated, and its potential as a source antimicrobial, antioxidant antiplasmodial compounds evaluated. bacterial community studied by isolation, cultivation 16S rRNA gene sequencing. Twenty-three strains were isolated identified Proteobacteria (α or γ classes) Actinobacteria phyla. Furthermore, three different morphotypes localized extracellularly within tissues revealed...
Combining culture-dependent and independent approaches, we investigated for the first time cultivable fraction of prokaryotic community associated with carnivorous sponge Asbestopluma hypogea. The heterotrophic prokaryotes isolated from this tiny were compared between specimens freshly collected cave maintained in aquarium. Overall, 67 isolates obtained pure culture phylogenetically affiliated to bacterial phyla Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes. This diversity was...
Two genes encoding proteins related to large subunits of Rubisco were identified in the genome planktonic cyanobacterium Microcystis aeruginosa PCC 7806 that forms water blooms worldwide. The rbcL(I) gene belongs form I subfamily typically encountered cyanobacteria, green algae, and land plants. second newly discovered is IV widespread genus. In M. cells, expression both rbcL(IV) sulfur-dependent. purified recombinant RbcL(IV) overexpressed Escherichia coli cells did not display CO(2)...
A halophilic organism, SWO25T, was isolated from water sampled in Algeria at the salt lake (sebkha) of Ouargla. The novel strain stained Gram-negative, and cells were pleomorphic with a red pigmentation. Strain SWO25T grew optimally 35-45 °C, pH 6.0-8.0 0.05-0.25 M MgCl2 concentrations. Cells extremely halophilic, optimal growth 4.3-5.1 NaCl. predominant membrane polar lipids C20C20 glycerol diether derivatives phosphatidylglycerol, phosphatidylglycerol phosphate, sulfate, triglycosyl...
Comte K., Coursin T. and Carre-Mlouka A. 2013. A new genotype in the genus Arthrospira (Oscillatoriales, Cyanobacteria) revealed by a mosaic-like structure of 16S-23SrRNA intergenic spacer region strain PCC 9901. Phycologia 52: 333–337. DOI: 10.2216/12–063.1We examined phylogenetic assignment Chinese 9901, cyanobacterium previously identified as Lyngbya laxespiralis, using phenotypic molecular approaches. Phylogenetic analysis 16S rRNA gene sequence showed that 9901 clustered with rather...
Insertion sequences (IS) have been characterized in Microcystis aeruginosa gas vesicle-deficient mutants. ISMae4, a homolog of the cyanobacterial IS702, belongs to IS5 family, subgroup ISL2. ISMae2 and ISMae3 display typical IS features express transposase IS4 IS1 respectively. ISMae1 exhibits more complex genetic structure harbours degenerated gene distantly related elements. Hybridizations with IS-specific DNA probes suggest that transposition occurred by replicative-type mechanism. To our...
Insertion sequences (IS) have been characterized in Microcystis aeruginosa gas vesicle-deficient mutants. ISMae4, a homolog of the cyanobacterial IS702, belongs to IS5 family, subgroup ISL2. ISMae2 and ISMae3 display typical IS features express transposase IS4 IS1 respectively. ISMae1 exhibits more complex genetic structure harbours degenerated gene distantly related elements. Hybridizations with IS-specific DNA probes suggest that transposition occurred by replicative-type mechanism. To our...
Frankia sp. strain B2 was isolated from Casuarina cunninghamiana nodules. Here, we report the 5.3-Mbp draft genome sequence of with a G+C content 70.1 % and 4,663 candidate protein-encoding genes. Analysis revealed presence high numbers secondary metabolic biosynthetic gene clusters.