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Microorganisms (bacteria, archaea, microeukaryotes) in marine environments secrete a diverse array of exopolymeric substances that facilitate attachment to surfaces, the formation of organic colloids and larger aggregations of cells (marine snow), and that can influence many ocean, as well as global, processes. The aim of this Research Topic is to highlight recent advances in the sources, chemistry and function of these microbial-produced macromolecules. We encouraged original research and reviews on exopolymeric substances, from their sources, chemico-physiological properties, functions and ecosystem effects, and including their role in the Gulf of Mexico following the Deepwater Horizon oil spill disaster.

marine oil snow (MOS) --- exopolymers --- marine environment --- biological pump --- phytoplankton --- marine snow --- oceans --- marine bacteria --- exopolysaccharide substances (EPS) --- organic carbon

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Marine habitats are promising sources to identify novel organisms and compounds. A total of 70% of the planet’s surface is covered by ocean, and little is known about the biosphere within these habitats. In the last few years, numerous novel bioactive compounds or secondary metabolites from marine environments have been described. This is, and will be, a promising source of candidate compounds in pharma research and chemical biology. In recent years, a number of novel techniques have been introduced to the field and it has become easier to actually (bio-)prospect compounds such as enzyme inhibitors. Those novel compounds then need to be characterized and evaluated in comparison to well-known representatives. This Special Issue focuses on the description of novel enzyme inhibitors of marine origin, including bioprospecting, omic approaches, and structural and mechanistic aspects.

Research & information: general --- sponge Monanchora pulchra --- pentacyclic guanidine alkaloids --- GH36 α-galactosidase --- GH109 α-N-acetylgalactosaminidase --- slow-binding irreversible inhibitor --- monanchomycalin B --- monanhocidin A --- normonanhocidin A --- Alzheimer′s disease --- BACE1 --- acetylcholinesterase --- in silico docking --- phlorotannins --- Ulva intestinalis --- ACE inhibitory peptide --- optimization --- purification --- structural identification --- molecular docking --- secondary metabolites --- Mycosphaerella sp. --- asperchalasine --- α-glucosidase --- kinase inhibitors --- drug development --- marine natural products --- inhibitor --- macroalgae --- marine fish --- protease --- Ulva ohnoi --- functional annotation --- structure–function relation --- natural products --- bioactives --- enzyme inhibition --- inactivation --- marine bacteria --- marine fungi --- marine sponges

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The G.B. Elyakov Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences (PIBOC FEB RAS) was founded in 1964 in Vladivostok in the Far East of Russia. Over many years, we have been carrying out studies on the natural products of both marine and terrestrial origin. In collaboration with many Russian and foreign scientists, we have investigated many hundreds of diverse biomolecules, including steroids and terpenoids, quinoid compounds and alkaloids, polysaccharides and lipids, enzymes and lectins, proteins, and peptides. The Institute has a collection of marine microorganisms (KMM) PIBOC, which includes more than 4000 strains of marine bacteria and more than 1000 strains of marine fungi. The biological activity of natural compounds is also being studied. This book includes the 14 manuscripts which covered almost all aspects of PIBOC research activity in the fields of bioorganic chemistry, biochemistry, organic synthesis of natural compounds, marine microbiology, and genetic engineering, and we hope it will provide interesting new information for scientists working in these fields.

Research & information: general --- polyhydroxylated steroids --- NMR spectra --- starfish --- Anthenoides laevigatus --- cytotoxicity --- soft agar assay --- kainic acid --- domoic acid --- dysiherbaine --- neodysiherbaine A --- marine bacteria --- whole genome sequence --- porin --- amino acids composition --- bilayer lipid membrane --- pore-forming activity --- spatial structure --- phlorotannins --- phlorethols --- anticancer activity --- colorectal cancer --- radiosensitizer --- radiotherapy --- 1,4-naphthoquinones --- quinoid compounds --- thioglycosides --- quinone-sugar conjugates --- cytotoxic activity --- antibiotic activity --- histochrome --- echinochrome A --- oxidative degradation --- HPLC–DAD–MS --- NMR --- actinoporin --- sea anemone --- Heteractis crispa --- anti-migratory activity --- glycosphingolipids --- cerebrosides --- peroxidation products --- structure elucidation --- allylic thioether --- ESI-MS --- GC-MS --- mass spectra --- glass sponge --- isomalabaricanes --- Stelletta sp. --- marine sponge --- terpenoid --- Cobetia amphilecti --- Cobetia litoralis --- Cobetia pacifica --- Cobetia marina --- Cobetia crustatorum --- identification markers --- alkaline phosphatase PhoA --- lanosterol 14-alpha demethylase --- flavonoids --- enzyme inhibition --- surface plasmon resonance --- spectral titration --- molecular docking --- Zobellia --- genomes --- polysaccharide lyase family 7 --- alginate utilization system --- paralogs --- orthologs --- recombinant phospholipase A1 --- Yersinia pseudotuberculosis --- inclusion bodies --- fusion protein --- green fluorescent protein --- porin gene expression --- antibiotic stress --- phenotypic heterogeneity --- n/a --- HPLC-DAD-MS

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This book presents contributions from scientists who are directly involved in the potential of marine enzymes as useful tools in biocatalysis; the results of enzymatic bioprospecting in gross marine environments are acknowledged, including two review articles on general enzymatic processes and microalgal enzymes. In addition, studies on structural characterizations, biological functions and aspects related to the complexity of marine enzyme-based bioprocesses are discussed. Prominent conclusions by many scientists in the field of marine biotechnology emphasize that, due to marine biological diversity and the specificity of biological marine metabolisms, the study of biocatalysts on a global scale from this environment is just starting, and possesses huge potential for the development of applications with industrial benefits.

Research & information: general --- Biology, life sciences --- metalloprotease --- adsorption analysis --- molecular docking --- affinity purification --- aminophenylboronic acid --- alginate degradation --- 4-deoxy-l-erythro-5-hexoseulose uronic acid (DEH) metabolism --- Bacteroidetes --- Proteobacteria --- Flavobacterium --- 2-keto-3-deoxy-d-gluconate (KDG) kinase --- 2-keto-3-deoxy-6-phosphogluconate (KDPG) aldolase --- alginate-derived products --- marine enzymes --- biocatalysts --- bioprocesses --- biorefinery --- seafood --- marine biomarkers --- collagenase --- fermentation optimization --- collagen --- Pseudoalteromonas --- antioxidant peptides --- microcystin-degrading bacteria --- mycotoxin --- protease --- esterase --- inhibitor --- marine agent --- Catenovulum --- alkaline and cold-adapted dextranase --- isomaltoogligosaccharides --- biofilm --- dental caries --- growing cells --- resting cells --- asymmetric reduction --- marine fungi --- chiral alcohols --- alginate lyase --- marine bacterium --- Bacillus sp. Alg07 --- purification --- alginate oligosaccharides --- Vibrio weizhoudaoensis --- PL7 family --- salt-activated enzyme --- Serratia marcescens --- polyM-specific --- oligosaccharides --- Isoptericola halotolerans --- bifunctional alginate lyase --- α-d-galactosidase --- homology model --- GH 36 family --- mutation --- transglycosylation --- marine bacteria --- Pseudoalteromonas sp. KMM 701 --- leucine dehydrogenase --- cold-adapted --- Antarctic bacterium --- sea-ice --- homology modeling --- fucoidan --- endo-fucoidanase --- galactofucan --- molecular stabilisation --- Sargassum mcclurei --- Turbinaria ornata --- Alteromonas --- deep sea --- cold-adapted enzyme --- β-galactosidase --- lactose-free milk --- chitosanases --- chitin deacetylase --- deacetylation patterns --- chitooligosaccharides --- separating --- detecting --- expression --- deep-sea enzyme --- pCold vector --- Ascophyllum nodosum --- algal cell wall degrading enzymes --- enzyme-assisted extraction --- ichip device --- quorum quenching enzyme --- error prone PCR --- high-throughput screening --- site-directed mutagenesis --- catalytic ability --- Pectobacterium carotovorum subsp. carotovorum (Pcc) --- Alginate lyase --- Thermo-tolerant --- pH-stability --- Endo-manner --- Vibrio sp. SY01 --- polysaccharide lyase of family 6 --- characterization --- degradation pattern --- microalgae --- enzymes --- marine biotechnology --- -omics technologies --- heterologous expression --- homologous expression