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The cell surface of fungi, bacteria and sea organisms is highly glycosylated. These glycans are oligo- or polysaccharide molecules that can be secreted or attached to protein or lipids forming glycoconjugates. They present extraordinary structural diversity that could explain their involvement in many fundamental cellular processes, including growth, differentiation and morphogenesis. Considerable advances have been made on the structural elucidation of these glycans. Their primary structures were determined based on a combination of mass spectrometry and NMR spectroscopy techniques. The combination of these sensitive and powerful techniques has allowed us to increase our structural knowledge of a wide variety of glycans expressed by different fungi, bacteria and sea organisms.

Fungal pathogens --- sea organisms --- NMR --- innate immunity --- Mass Spectrometry --- sulfated polysaccharides --- carbohydrate-based drug development --- Pattern Recognition Receptors --- Plant-Bacterium Interaction --- Adhesion --- fungal glycoconjugates

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Over 70% of the Earth’s surface is covered by oceans and seas, which are massively complex and consist of diverse assemblages of life forms. Marine bacteria, fungi, and other microorganisms develop unique metabolic and physiological capabilities that enable them to survive in extreme habitats and to produce compounds that might not be produced by their terrestrial counterparts. In the last few decades, the systematic investigations of marine/marine-derived microorganisms as sources of novel biologically active agents has exponentially increased. This Special Issue will focus on aspects relating to new bioactive metabolites from marine microorganisms including the isolation, taxonomy, and/or dereplication of microorganisms and the corresponding isolation, structure elucidation, biosynthesis, and/or biological activities of the new compounds. Comprehensive topical review articles relating to marine metabolites will also be considered.

Medicine --- co-culture --- marine microbes --- natural products --- structural diversity --- biological activities --- food allergy --- deep-sea-derived viridicatol --- X-ray single crystal --- intestinal barrier --- mast cell --- calcium influx --- Chlorella --- enzymes --- lipases --- molecular modeling --- sulfated polysaccharides --- antiviral --- SARS-CoV-2 --- docking --- molecular dynamic simulations --- sea cucumber --- bioactivity --- diversity --- microorganism --- polyketides --- alkaloids --- marine-derived fungus --- Penicillium sp. --- indole-diterpenoids --- cytotoxicity --- antibacterial activity --- Leizhou Peninsula --- mangrove soil --- actinomycetia --- antimicrobial activity --- secondary metabolites --- dereplication --- metabolomics tools --- trioxacarcins --- mansouramycins --- isoquinolinequinones --- marine-derived Streptomyces sp. --- co-culture --- marine microbes --- natural products --- structural diversity --- biological activities --- food allergy --- deep-sea-derived viridicatol --- X-ray single crystal --- intestinal barrier --- mast cell --- calcium influx --- Chlorella --- enzymes --- lipases --- molecular modeling --- sulfated polysaccharides --- antiviral --- SARS-CoV-2 --- docking --- molecular dynamic simulations --- sea cucumber --- bioactivity --- diversity --- microorganism --- polyketides --- alkaloids --- marine-derived fungus --- Penicillium sp. --- indole-diterpenoids --- cytotoxicity --- antibacterial activity --- Leizhou Peninsula --- mangrove soil --- actinomycetia --- antimicrobial activity --- secondary metabolites --- dereplication --- metabolomics tools --- trioxacarcins --- mansouramycins --- isoquinolinequinones --- marine-derived Streptomyces sp.

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Over 70% of the Earth’s surface is covered by oceans and seas, which are massively complex and consist of diverse assemblages of life forms. Marine bacteria, fungi, and other microorganisms develop unique metabolic and physiological capabilities that enable them to survive in extreme habitats and to produce compounds that might not be produced by their terrestrial counterparts. In the last few decades, the systematic investigations of marine/marine-derived microorganisms as sources of novel biologically active agents has exponentially increased. This Special Issue will focus on aspects relating to new bioactive metabolites from marine microorganisms including the isolation, taxonomy, and/or dereplication of microorganisms and the corresponding isolation, structure elucidation, biosynthesis, and/or biological activities of the new compounds. Comprehensive topical review articles relating to marine metabolites will also be considered.

co-culture --- marine microbes --- natural products --- structural diversity --- biological activities --- food allergy --- deep-sea-derived viridicatol --- X-ray single crystal --- intestinal barrier --- mast cell --- calcium influx --- Chlorella --- enzymes --- lipases --- molecular modeling --- sulfated polysaccharides --- antiviral --- SARS-CoV-2 --- docking --- molecular dynamic simulations --- sea cucumber --- bioactivity --- diversity --- microorganism --- polyketides --- alkaloids --- marine-derived fungus --- Penicillium sp. --- indole-diterpenoids --- cytotoxicity --- antibacterial activity --- Leizhou Peninsula --- mangrove soil --- actinomycetia --- antimicrobial activity --- secondary metabolites --- dereplication --- metabolomics tools --- trioxacarcins --- mansouramycins --- isoquinolinequinones --- marine-derived Streptomyces sp. --- n/a

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The marine environment is considered one of the most important sources of natural bioactive compounds with extremely rich biodiversity. Marine glycans are remarkable molecules, playing a determinant role in biological processes. Marine сarbohydrate-containing substances have drawn increasing attention in the field of biomedicine for their various biological activities, such as antitumor, antivirus, hypoglycemic, immunomodulatory, and anticoagulant. These compounds obtained from marine sources, such as algae, microbes, and animals, are usually biodegradable and biocompatible, and exhibit biological properties that contribute to the discovery of a wide range of new bioactive substances with special pharmacological properties of interest to medicine. Carbohydrate-based compounds include glycans, glycoproteins, proteoglycans, glycolipids, and low-molecular and complex glycosides of differential origin. Many of the polysaccharides allow for loading lower drug dosages, which may lead to a drastic reduction of the side effects caused by the drugs. In addition, the structure of polysaccharides can be relatively easily modified in order to synthesize derivatives with desirable characteristics for drug delivery. Complexes on the basis of carbohydrates are often prepared to improve their functional properties. In this Special Issue, we seek to contribute to the discussion of various aspects of marine carbohydrate-containing compounds and provide a unique platform for a new concept for their use in medicine in order to continue to facilitate further research in this area.

Medicine --- chitosan-gentamicin conjugate --- antimicrobial --- anti-inflammatory --- scald repair --- sulfated polysaccharides --- galactans --- green seaweed --- NMR --- immunostimulation --- inflammatory mediators --- carrageenan --- lipopolysaccharide --- macromolecular structure --- nonspecific resistance to lipopolysaccharide --- cytokines --- enteric infections --- salmonellosis --- glyceroglycolipid metabolism --- phosphate starvation --- transcriptome --- glyceroglycolipid homeostasis --- chitosan --- polyelectrolyte complex --- cytokine --- nitric oxide --- anti-inflammatory activity --- Ulva pertusa --- polysaccharides --- colitis --- antioxidant --- exopolysaccharide --- structure --- Vibrio alginolyticus --- Epidermist --- chitosan oligosaccharides --- inflammation cytokines --- intestine --- oxidative status --- oxidative stress --- Porphyridium marinum --- high pressure homogenizer --- antibacterial activity --- anti-biofilm activity --- anti-cancer activity --- alginate lyase --- cold-adapted --- exo/endo-type --- Alteromonas portus --- oligosaccharide --- antioxidant activity --- exopolysaccharides --- scandium --- theranostic --- cancer cell lines --- proliferation --- laminarin --- fucoidan --- gastrointestinal tract --- microbiome --- swine --- post-weaning --- antibiotic alternatives --- chitosan-gentamicin conjugate --- antimicrobial --- anti-inflammatory --- scald repair --- sulfated polysaccharides --- galactans --- green seaweed --- NMR --- immunostimulation --- inflammatory mediators --- carrageenan --- lipopolysaccharide --- macromolecular structure --- nonspecific resistance to lipopolysaccharide --- cytokines --- enteric infections --- salmonellosis --- glyceroglycolipid metabolism --- phosphate starvation --- transcriptome --- glyceroglycolipid homeostasis --- chitosan --- polyelectrolyte complex --- cytokine --- nitric oxide --- anti-inflammatory activity --- Ulva pertusa --- polysaccharides --- colitis --- antioxidant --- exopolysaccharide --- structure --- Vibrio alginolyticus --- Epidermist --- chitosan oligosaccharides --- inflammation cytokines --- intestine --- oxidative status --- oxidative stress --- Porphyridium marinum --- high pressure homogenizer --- antibacterial activity --- anti-biofilm activity --- anti-cancer activity --- alginate lyase --- cold-adapted --- exo/endo-type --- Alteromonas portus --- oligosaccharide --- antioxidant activity --- exopolysaccharides --- scandium --- theranostic --- cancer cell lines --- proliferation --- laminarin --- fucoidan --- gastrointestinal tract --- microbiome --- swine --- post-weaning --- antibiotic alternatives

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Fucoidans are a group of fucose-containing sulfated polysaccharides found in many species of brown seaweeds, with numerous bioactive properties. As a highly bioactive seaweed substance with many promising physiological activities, fucoidans have attracted attention from many industries all over the world. Even though fucoidans are a rich source of bioactive properties, the structural properties and bioactive mechanisms of fucoidans are poorly understood. Therefore, novel studies that either characterize the physical properties or biological activities of fucoidans will fill the knowledge gap between industrial applications and the scientific background of those applications. Both purified and partially purified fucoidans isolated from brown seaweeds present high potential as preventative and therapeutic agents against number of chronic diseases, due to their anti-inflammatory, antioxidant, anticancer, neuroprotective, antiviral, antimicrobial, and anticoagulative properties. This Special Issue is aimed at presenting updated information on well-documented studies of the structural characterization and major biological actions relevant for medical, cosmeceutical, and pharmaceutical applications that fucoidans isolated from brown seaweed can offer.

Medicine --- fucoidan --- low-molecular-weight fucoidan --- adriamycin --- nephrotic syndrome --- psoriasis --- Traf3ip2 --- microbiota --- mucin --- IgA --- fucoidans --- extraction --- brown algae --- production --- bioactivities --- Sri Lankan algae --- anticancer --- sulfated polysaccharide --- Celluclast --- sargassum --- antioxidant --- Maldives --- Padina boryana --- zebrafish --- apoptosis --- DR4 --- mitochondrial pathway --- cancer --- metastasis --- epithelial mesenchymal transition --- nanoparticles --- Helicobacter pylori --- mozuku --- Cladosiphon okamuranus Tokida --- urinalysis --- fucose --- enzymatic purification --- age-related macular degeneration --- VEGF --- oxidative stress --- Laminaria digitata --- Fucus distichus subsp. evanescens --- Saccharina latissima --- retinal pigment epithelium --- ROS --- Phaeophyta --- carbohydrate --- UVB irradiation --- HaCaT cells --- sulfated heterosaccharide --- dopamine neurons apoptosis --- PI3K–Akt --- ascorbic acid --- anti-lung cancer --- human lung carcinoma A-549 cells --- hydrogen peroxide --- Sargassum crassifolium --- fucoidan from Ascophyllum nodosum --- postprandial hyperglycemia --- in vitro and in vivo evaluation --- SGLT1 --- chitosan --- fibroblast growth factor-2 --- polyelectrolyte multilayer --- infrared spectroscopy --- quartz crystal microbalance --- sulfated polysaccharides --- natural defenses --- phenolic metabolism --- phenylalanine ammonia-lyase --- n/a --- PI3K-Akt