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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Medical microbiology & virology --- Microbiology (non-medical) --- Quorum Quenching --- Antimicrobial Resistance --- (Anti)Fouling --- Signaling --- Biotechnology --- Quorum Quenching --- Antimicrobial Resistance --- (Anti)Fouling --- Signaling --- Biotechnology

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Applied biocatalysis and biotransformation, that is, the use of enzymes and whole-cell systems in manufacturing processes for synthetic purposes, has been experiencing a clear boom in recent years, which has led to the start of the so-called “fourth wave”. In fact, the latest advances in bioinformatics, system biology, process intensification, and, in particular, enzyme-directed evolution (encouraged by the 2018 Nobel Prize awarded to F. Arnold), are widening the range of the efficacy of biocatalysts and accelerating the rate at which new enzymes are becoming available, even for activities not previously known. European scientists have been very actively involved in different aspects of this field. Nine contributions dealing with different aspects of applied biocatalysis developed by European researchers are gathered in this Special Issue

Research & information: general --- biocatalysis --- glycosidases --- isomerases --- Pichia pastoris --- sweeteners --- rare sugars --- cheese whey --- sustainable chemistry --- penicillin acylase --- aculeacin acylase --- N-acyl-homoserine lactone acylases --- quorum quenching --- biofouling --- estolides --- castor oil --- lipase --- candida antarctica lipase A --- Arabidopsis thaliana --- hydroxynitrile lyase --- oxynitrilase --- His-tag --- immobilization --- batch --- continuous flow --- Geobacillus thermocatenolatus --- lipases --- ethanolysis --- ionic liquids --- kinetic resolution --- mandelic acid --- Aspergillus --- fermentation --- filamentous fungi --- genetic engineering --- heterologous expression --- recombinant protein --- secretion --- transcriptional regulation --- n/a --- Halohydrin dehalogenases --- conformational dynamics --- active site tunnels --- molecular dynamics simulations --- omega-3 ethyl esters --- monkfish liver oil --- COSMO-RS --- fungal resting cells --- selectivity --- ketone body ester --- asymmetric synthesis --- configuration inversion

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Applied biocatalysis and biotransformation, that is, the use of enzymes and whole-cell systems in manufacturing processes for synthetic purposes, has been experiencing a clear boom in recent years, which has led to the start of the so-called “fourth wave”. In fact, the latest advances in bioinformatics, system biology, process intensification, and, in particular, enzyme-directed evolution (encouraged by the 2018 Nobel Prize awarded to F. Arnold), are widening the range of the efficacy of biocatalysts and accelerating the rate at which new enzymes are becoming available, even for activities not previously known. European scientists have been very actively involved in different aspects of this field. Nine contributions dealing with different aspects of applied biocatalysis developed by European researchers are gathered in this Special Issue

Research & information: general --- biocatalysis --- glycosidases --- isomerases --- Pichia pastoris --- sweeteners --- rare sugars --- cheese whey --- sustainable chemistry --- penicillin acylase --- aculeacin acylase --- N-acyl-homoserine lactone acylases --- quorum quenching --- biofouling --- estolides --- castor oil --- lipase --- candida antarctica lipase A --- Arabidopsis thaliana --- hydroxynitrile lyase --- oxynitrilase --- His-tag --- immobilization --- batch --- continuous flow --- Geobacillus thermocatenolatus --- lipases --- ethanolysis --- ionic liquids --- kinetic resolution --- mandelic acid --- Aspergillus --- fermentation --- filamentous fungi --- genetic engineering --- heterologous expression --- recombinant protein --- secretion --- transcriptional regulation --- Halohydrin dehalogenases --- conformational dynamics --- active site tunnels --- molecular dynamics simulations --- omega-3 ethyl esters --- monkfish liver oil --- COSMO-RS --- fungal resting cells --- selectivity --- ketone body ester --- asymmetric synthesis --- configuration inversion --- biocatalysis --- glycosidases --- isomerases --- Pichia pastoris --- sweeteners --- rare sugars --- cheese whey --- sustainable chemistry --- penicillin acylase --- aculeacin acylase --- N-acyl-homoserine lactone acylases --- quorum quenching --- biofouling --- estolides --- castor oil --- lipase --- candida antarctica lipase A --- Arabidopsis thaliana --- hydroxynitrile lyase --- oxynitrilase --- His-tag --- immobilization --- batch --- continuous flow --- Geobacillus thermocatenolatus --- lipases --- ethanolysis --- ionic liquids --- kinetic resolution --- mandelic acid --- Aspergillus --- fermentation --- filamentous fungi --- genetic engineering --- heterologous expression --- recombinant protein --- secretion --- transcriptional regulation --- Halohydrin dehalogenases --- conformational dynamics --- active site tunnels --- molecular dynamics simulations --- omega-3 ethyl esters --- monkfish liver oil --- COSMO-RS --- fungal resting cells --- selectivity --- ketone body ester --- asymmetric synthesis --- configuration inversion

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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

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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 --- 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