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The intramolecular SEA ligation for the preparation of cyclic peptides of various sizes was studied under microfluidic conditions. Two type of peptides, namely POL (10 residues) and RTD-1 (18 residues) as well as difficult junctions (e.g. valine, isoleucine, and threonine) were chosen as the main targets of this research. The microfluidic setup for the intramolecular SEA ligation formally telescoped two process steps. In the first microreactor, the reversible N,S-acyl shift reaction lead to the reactive SEA thioester species in ~90% conversion for all studied peptides. The telescoping of the first step and the use of the reactive SEA thioester species in the capture step of the N- terminal cysteine mediated by an exogenous arylthiol catalyst produced a cyclic thioester intermediate which upon irreversible S,N-acyl shift gave the final cyclic product. This fully telescoped process of 64 (POL and analogs) to 75 min (RTD-1 and analogs) total residence time gave the associated desired cyclic product with conversions ranging from 60 to 96% depending on the peptide sequence and the ligation site.

SEA Ligation --- Peptides --- Cyclic Peptides --- Microfluidic --- Physique, chimie, mathématiques & sciences de la terre > Chimie

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Dear Colleagues, Synthetic biology is a broad and emerging discipline that capitalizes on recent advances in molecular biology, genetics, protein and RNA engineering and omics technologies. These technologies have transformed our ability to reveal the biology of the cell and the molecular basis of disease.

growth effect --- lysine acetylation --- Escherichia coli --- posttranslational modification --- class II aminoacyl-tRNA synthetase --- amber stop codon suppression --- genetic code expansion --- yeasts --- phosphoseryl-tRNA synthetase --- M. jannaschii orthogonal pair --- gene ontology --- selenocysteine --- genetic firewall --- indirect tRNA aminoacylation --- tRNA editing --- unnatural nucleotides --- reverse polymerization --- RNA metabolism --- genome editing --- tRNA --- tRNASer --- alternative amino acid and nucleotide repertoires --- biocontainment --- fluorescent reporter --- optogenetics --- tRNASep --- GluRS-like --- genetic isolation --- live cell imaging --- alternative core cellular chemistries --- fluorescence-based screen --- phosphoinositide dependent kinase 1 --- synthetic biology --- mistranslation --- tRNA repair --- synthetic life --- CUG-Ser --- unnatural amino acids --- recombinant protein production --- biopharmaceuticals --- protein modification --- functional conservation --- branched-chain amino acids --- alanyl-tRNA synthetase --- release factor 1 --- cyclic peptides --- AspRS --- xenobiology --- DNA delivery --- gene overexpression --- non-canonical amino acids --- ASKA collection --- protein kinase B --- codon bias --- microRNA quantification --- anticodon --- small molecule drug screening --- mRNA display --- genetic tools --- protein engineering --- misacylation --- transfer RNA --- Metschnikowia --- genome synthesis --- expanded genetic code --- yeast two hybrid --- orthogonal central dogma of molecular biology --- microRNA --- genome engineering

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Many research teams are working to demonstrate that microorganisms can be our daily partners, due to the great diversity of biochemical transformations and molecules they are able to produce. This Special Issue highlights several facets of the production of microbial metabolites of interest. From the discovery of new strains or new bioactive molecules issued from novel environments, to the increase in their synthesis by traditional or innovative methods, different levels of biotechnological processes are addressed. Combining the new dimensions of "Omics" sciences, such as genomics, transcriptomics or metabolomics, microbial biotechnologies are opening up incredible opportunities for discovering and improving microorganisms and their production.

Research & information: general --- Biology, life sciences --- Microbiology (non-medical) --- Docosahexaenoic acid (DHA) --- polyunsaturated fatty acids (PUFAs) --- mutant strain --- Aurantiochytrium sp. --- transcriptome --- Xanthomonas campestris pv. campestris --- 6-pentyl-α-pyrone --- antibiosis --- Trichoderma --- secondary metabolites --- antibiofilm --- Gram-negative bacterium --- antibiotic resistance --- natural products --- angucycline --- aquayamycin --- glycosyltransferase --- Lake Baikal --- Streptomyces --- Talaromyces albobiverticillius 30548 --- submerged fermentation --- pigments --- biomass --- optimization --- Box–Behnken experimental design --- response surface modeling --- carnosic acid --- propolis --- antifungal action --- synergy --- Candida albicans --- biofilms --- sponges --- actinomycetes --- cryptic --- Micromonospora --- Nocardia --- Gordonia --- mycolic acid --- LC-HRESIMS --- N-functionalized amines --- N-methylanthranilate --- Corynebacterium glutamicum --- metabolic engineering --- sustainable production of quinoline precursors --- acridone --- quinazoline alkaloid drugs --- SARS-CoV-2 --- Covid-19 --- Mpro --- microbial natural products --- docking --- molecular dynamic simulation --- Serratiochelin A --- Serratiochelin C --- Serratia sp. --- siderophore --- iron --- anticancer --- microbial biotechnology --- degradation --- antibacterial --- S. aureus --- sparkling wine --- second fermentation --- fermentation by-products --- Saccharomyces cerevisiae flor yeast --- proteins --- Scopalina hapalia --- Actinomycetes --- Bacillus --- Fungi --- elastase inhibition --- tyrosinase inhibition --- CDK7 inhibition --- Fyn kinase inhibition --- catalase activation --- sirtuin 1 activation --- Curvularia papendorfii --- endophytic fungi --- human coronavirus HCoV 229E --- Staphylococcus sp. --- MRSA --- antiproliferative activity --- polyhydroxyacid --- kheiric acid --- insect --- mealworm --- gut bacteria --- OSMAC --- cyclic peptides --- biosynthetic pathway --- autophagy inducer --- fermentation --- Lactococcus lactis --- bacteriocin --- culture conditions --- medium compositions --- lactic acid fermentation --- Pediococcus acidilactici PA204 --- simultaneous saccharification and fermentation --- corn stover --- pyocyanin --- maize industry wastewater --- Pseudomonas aeruginosa NEJ01R --- redox metabolite --- response surface analysis --- bioproduction --- valorization --- electrochemical analysis --- sugarcane --- distillery waste water --- molasses spent wash --- vinasse --- fungi --- yeasts --- bioremediation --- COD --- discoloration --- antimicrobial --- antioxidant --- GNPS --- textiles --- cation-exchange resin --- adsorption --- removal --- ammonium --- cell viability --- mutant gdhA P. multocida B:2 --- cyanobacteria --- photosynthesis --- synthetic biology --- systems biology --- genome-scale model --- protoplast fusion --- novel compound discovery --- cell wall-deficiency --- heteroploidy --- Talaromyces --- azaphilone --- marine fungi --- N-threonyl-rubropunctamin --- PP-R --- greener extraction --- red pigments --- fungal pigments --- antinematode compound --- anthelminthic drugs --- marine epiphytic bacteria --- marine biofilm --- marine environment --- parasitic nematode --- Caenorhabditis elegans --- natural colors --- bio-pigments --- quorum sensing --- marine bacteria --- biosynthesis --- biological activities --- industrial applications --- therapeutic insights --- global pigment market --- terpenoids --- sesquiterpene production --- Rhodobacter capsulatus --- β-caryophyllene --- bioactivity --- phytopathogens --- plant pathogenic fungi --- plant growth-promoting bacteria --- microorganisms --- biotechnology --- screening --- production --- extraction --- bioactive properties --- perspectives --- Docosahexaenoic acid (DHA) --- polyunsaturated fatty acids (PUFAs) --- mutant strain --- Aurantiochytrium sp. --- transcriptome --- Xanthomonas campestris pv. campestris --- 6-pentyl-α-pyrone --- antibiosis --- Trichoderma --- secondary metabolites --- antibiofilm --- Gram-negative bacterium --- antibiotic resistance --- natural products --- angucycline --- aquayamycin --- glycosyltransferase --- Lake Baikal --- Streptomyces --- Talaromyces albobiverticillius 30548 --- submerged fermentation --- pigments --- biomass --- optimization --- Box–Behnken experimental design --- response surface modeling --- carnosic acid --- propolis --- antifungal action --- synergy --- Candida albicans --- biofilms --- sponges --- actinomycetes --- cryptic --- Micromonospora --- Nocardia --- Gordonia --- mycolic acid --- LC-HRESIMS --- N-functionalized amines --- N-methylanthranilate --- Corynebacterium glutamicum --- metabolic engineering --- sustainable production of quinoline precursors --- acridone --- quinazoline alkaloid drugs --- SARS-CoV-2 --- Covid-19 --- Mpro --- microbial natural products --- docking --- molecular dynamic simulation --- Serratiochelin A --- Serratiochelin C --- Serratia sp. --- siderophore --- iron --- anticancer --- microbial biotechnology --- degradation --- antibacterial --- S. aureus --- sparkling wine --- second fermentation --- fermentation by-products --- Saccharomyces cerevisiae flor yeast --- proteins --- Scopalina hapalia --- Actinomycetes --- Bacillus --- Fungi --- elastase inhibition --- tyrosinase inhibition --- CDK7 inhibition --- Fyn kinase inhibition --- catalase activation --- sirtuin 1 activation --- Curvularia papendorfii --- endophytic fungi --- human coronavirus HCoV 229E --- Staphylococcus sp. --- MRSA --- antiproliferative activity --- polyhydroxyacid --- kheiric acid --- insect --- mealworm --- gut bacteria --- OSMAC --- cyclic peptides --- biosynthetic pathway --- autophagy inducer --- fermentation --- Lactococcus lactis --- bacteriocin --- culture conditions --- medium compositions --- lactic acid fermentation --- Pediococcus acidilactici PA204 --- simultaneous saccharification and fermentation --- corn stover --- pyocyanin --- maize industry wastewater --- Pseudomonas aeruginosa NEJ01R --- redox metabolite --- response surface analysis --- bioproduction --- valorization --- electrochemical analysis --- sugarcane --- distillery waste water --- molasses spent wash --- vinasse --- fungi --- yeasts --- bioremediation --- COD --- discoloration --- antimicrobial --- antioxidant --- GNPS --- textiles --- cation-exchange resin --- adsorption --- removal --- ammonium --- cell viability --- mutant gdhA P. multocida B:2 --- cyanobacteria --- photosynthesis --- synthetic biology --- systems biology --- genome-scale model --- protoplast fusion --- novel compound discovery --- cell wall-deficiency --- heteroploidy --- Talaromyces --- azaphilone --- marine fungi --- N-threonyl-rubropunctamin --- PP-R --- greener extraction --- red pigments --- fungal pigments --- antinematode compound --- anthelminthic drugs --- marine epiphytic bacteria --- marine biofilm --- marine environment --- parasitic nematode --- Caenorhabditis elegans --- natural colors --- bio-pigments --- quorum sensing --- marine bacteria --- biosynthesis --- biological activities --- industrial applications --- therapeutic insights --- global pigment market --- terpenoids --- sesquiterpene production --- Rhodobacter capsulatus --- β-caryophyllene --- bioactivity --- phytopathogens --- plant pathogenic fungi --- plant growth-promoting bacteria --- microorganisms --- biotechnology --- screening --- production --- extraction --- bioactive properties --- perspectives