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Book
Modulation de l'expression de la tyrosine hydroxylase dans les cellules transfectées exprimant le récepteur de la neurotensine
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Year: 1994 Publisher: Bruxelles: UCL,

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La neurotensine, neuropeptide de treize acides aminés médie ses effets suite sa liaison spécifique à son récepteur. Il a été démontré qu’elle induit l’activation de la phospholipase C conduisant à l’augmentation de la concentration cytosolique de calcium ainsi que l’activation de la protéine kinase C. Par ailleurs, des études radio-immunologiques ont montré une colocation de la neurotensine avec la dopamine, médiateur des voies dopaminergiques au niveau des neurones des systèmes méso limbiques et nigrostrié. Cette colocation témoigne d’une interaction entre ces deux neurotransmetteurs.
L’équipe de Castel a démontré l’existence de cette interaction in vivo puisque l’injection de neurotensine à proximité des terminaisons dopaminergiques dans le striatum, était suivie de son internalisation, de son transport vers le corps cellulaire et de l’augmentation d’une telle réponse génétique à la stimulation par la neurotensine a conduit cette équipe à proposer un rôle direct pour la neurotensine internalisée, de régulateur de la transcription du gène de la tyrosine hydroxylase.
L’objectif principal de ce mémoire consistait à étudier un éventuel effet de la neurotensine sur la modulation de l’expression de la tyrosine hydroxylase dans un modèle cellulaire exprimant de manière fonctionnelle, le récepteur de la neurotensine.
Dans un premier temps, ces travaux ont permis de montrer une internalisation de la neurotensine par une mécanisme dépendant de la présence du récepteur. Par ailleurs, des expériences de Nothern blot et de Western blot n’ont indiqué aucune augmentation décelable de l’ARN messager ni de la protéine correspondant à la tyrosine hydroxylase, suite à la stimulation du récepteur de la neurotensine. L’absence d’effet de la neurotensine sur l’expression de la tyrosine hydroxylase dans les cellules PC12 transfectées indique la présence du récepteur de la neurotensine, sa stimulation par la peptide, l’apparition de seconds messagers intra cellulaires et l’internalisation ne sont par des événements suffisants pour entraîner une induction de l’expression de la tyrosine hydroxylase. De plus, certaines de nos expériences permettent de mettre en doute un éventuel rôle de la protéine kinase C dans l’augmentation de l’expression génétique de la tyrosine hydroxylase suite à la stimulation du récepteur de la neurotensine.


Book
Albinism in Africa : historical, geographic, medical, genetic, and psychosocial aspects
Authors: ---
ISBN: 0128133171 0128133163 9780128133170 9780128133163 Year: 2018 Publisher: London, England : Academic Press,

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Albinism in Africa: Historical, Geographic, Medical, Genetic, and Psychosocial Aspects provides the first in-depth reference for understanding and treating patients of human albinism in Africa. Leading international contributors examine the historical, geographic, psychosocial, genetic and molecular considerations of importance in effectively and sensitively managing this genetic disorder. Foundational chapters covering the historical and psychosocial aspects of albinism are supplemented by discussions of the pathobiology of the disease, as well as a thorough analysis of the genetics of skin pigmentation, eye pigmentation, hair pigmentation, and incidents of skin cancer involved in the manifestations of this disorder. New prenatal diagnostics and genetic testing methods, genetic risk assessment for individuals, families, and communities, and novel genetic markers that may be used for developing new therapeutics for treating albinism are also discussed in detail. The book provides care management approaches that may be applied to instances of albinism in other regions, along with guiding principles for treating rare genetic disorders and stigmatized patient populations across the globe.

Cytochrome PDP450
Authors: ---
ISBN: 3540559086 0387559086 3642777651 3642777635 Year: 1993 Volume: vol 105 Publisher: Heidelberg; Berlin; New York Springer Verlag

Cytochrome P450
Authors: ---
ISSN: 00766879 ISBN: 0121822605 9786611011314 1281011312 0080497020 9780121822606 0121821730 9780121821074 0121821072 9780121821739 Year: 1991 Volume: 357 Publisher: London ; San Diego, CA : Academic Press,

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The critically acclaimed laboratory standard for more than forty years, Methods in Enzymology is one of the most highly respected publications in the field of biochemistry. Since 1955, each volume has been eagerly awaited, frequently consulted, and praised by researchers and reviewers alike. Now with more than 300 volumes (all of them still in print), the series contains much material still relevant today?truly an essential publication for researchers in all fields of life sciences.Key Features* Human Genomics and Genetics* Structure and Mechanism* Regulation of Expr

Keywords

Cytochrome P-450 Enzyme System. --- Cytochromes --- Mixed Function Oxygenases --- Enzymes and Coenzymes --- Oxygenases --- Hemeproteins --- Oxidoreductases --- Chemicals and Drugs --- Proteins --- Enzymes --- Amino Acids, Peptides, and Proteins --- Cytochrome P-450 Enzyme System --- Human Anatomy & Physiology --- Health & Biological Sciences --- Animal Biochemistry --- CYP450 Family --- CYP450 Superfamily --- Cytochrome P-450 Enzymes --- Cytochrome P-450 Families --- Cytochrome P-450 Monooxygenase --- Cytochrome P-450 Oxygenase --- Cytochrome P-450 Superfamily --- Cytochrome P450 --- Cytochrome P450 Superfamily --- Cytochrome p450 Families --- P-450 Enzymes --- P450 Enzymes --- Cytochrome P-450 --- Cytochrome P-450-Dependent Monooxygenase --- Cytochrome P 450 --- Cytochrome P 450 Dependent Monooxygenase --- Cytochrome P 450 Enzyme System --- Cytochrome P 450 Enzymes --- Cytochrome P 450 Families --- Cytochrome P 450 Monooxygenase --- Cytochrome P 450 Oxygenase --- Cytochrome P 450 Superfamily --- Enzymes, Cytochrome P-450 --- Enzymes, P-450 --- Enzymes, P450 --- Monooxygenase, Cytochrome P-450 --- Monooxygenase, Cytochrome P-450-Dependent --- P 450 Enzymes --- P-450 Enzymes, Cytochrome --- Superfamily, CYP450 --- Superfamily, Cytochrome P-450 --- Superfamily, Cytochrome P450 --- Biocatalysts --- Molecular Mechanisms of Pharmacological Action --- Gene Products, Protein --- Gene Proteins --- Protein Gene Products --- Proteins, Gene --- Dehydrogenase --- Oxidase --- Reductase --- Dehydrogenases --- Oxidases --- Reductases --- Heme Protein --- Heme Proteins --- Protein, Heme --- Proteins, Heme --- Coenzymes and Enzymes --- Mixed Function Oxidases --- Hydroxylases --- Monooxygenases --- Oxidases, Mixed Function --- Oxygenases, Mixed Function --- Cytochrome --- Cytochrome P-450 Enzyme --- P-450 Enzyme --- P450 Enzyme --- Cytochrome P 450 Enzyme --- Enzyme, Cytochrome P-450 --- Enzyme, P-450 --- Enzyme, P450 --- P 450 Enzyme --- P-450 Enzyme, Cytochrome --- Biocatalyst --- Enzyme --- Protein --- Oxidoreductase --- Hemeprotein --- Oxygenase --- Hydroxylase --- Mixed Function Oxidase --- Mixed Function Oxygenase --- Monooxygenase --- Function Oxidase, Mixed --- Function Oxygenase, Mixed --- Oxidase, Mixed Function --- Oxygenase, Mixed Function --- Metalloenzymes --- Enzymology --- Cytochrome p-450 --- Microsomes --- Basic Sciences. Chemistry --- Cytochrome P-450. --- Biochemistry --- Proteins and Enzymes. --- analysis.


Book
Biocatalytic Process Optimization
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Biocatalysis is very appealing to the industry because it allows, in principle, the synthesis of products not accessible by chemical synthesis. Enzymes are very effective, as are precise biocatalysts, as they are enantioselective, with mild reaction conditions and green chemistry. Biocatalysis is currently widely used in the pharmaceutical industry, food industry, cosmetic industry, and textile industry. This includes enzyme production, biocatalytic process development, biotransformation, enzyme engineering, immobilization, the synthesis of fine chemicals and the recycling of biocatalysts. One of the most challenging problems in biocatalysis applications is process optimization. This Special Issue shows that an optimized biocatalysis process can provide an environmentally friendly, clean, highly efficient, low cost, and renewable process for the synthesis and production of valuable products. With further development and improvements, more biocatalysis processes may be applied in the future.

Keywords

Research & information: general --- catechin --- degalloylation --- flavonol --- glycoside hydrolase --- optimization --- tannase --- immobilized DERA --- statin side chain --- continuous flow synthesis --- alginate-luffa matrix --- design of experiments --- Anguilla marmorata --- eel protein hydrolysates --- functional properties --- herbal eel extracts --- agarose --- agarase --- agarotriose --- agaropentaose --- expression --- calycosin --- calycosin-7-O-β-D-glucoside --- glucosyltransferase --- sucrose synthase --- UDP-glucose recycle --- UGT–SuSy cascade reaction --- Candida antarctica lipase A --- surface-display system --- shear rate --- mass transfer rate --- enzymatic kinetic study --- enzymatic synthesis --- β-amino acid esters --- microreactor --- aromatic amines --- Michael addition --- kraft pulp --- cellulose --- xylan --- enzymatic hydrolysis --- Penicillium verruculosum --- glucose --- xylose --- lipase --- acidolysis --- docosahexaenoic acid ethyl ester --- eicosapentaenoic acid ethyl ester --- ethyl acetate --- kinetics --- styrene monooxygenase --- indole monooxygenase --- two-component system --- chiral biocatalyst --- solvent tolerance --- biotransformation --- epoxidation --- NAD(P)H-mimics --- superoxide dismutase (SOD) --- catalase (CAT) --- glutathione reductase (GR) --- aluminum (Al) --- selenium (Se) --- mouse --- brain --- liver --- phosphatidylcholine --- 3,4-dimethoxycinnamic acid --- enzymatic interesterification --- biocatalysis --- Pleurotus ostreatus --- enenzymatic hydrolysis --- peptide --- antioxidant --- hepatoprotective activity --- Yarrowia lipolytica --- whole–cell biocatalysis --- indolizine --- cycloaddition --- trehalose --- viscosity --- enzymes --- protein dynamics --- Kramers’ theory --- protein stabilization --- enzyme inhibition --- Lipase --- transesterification --- 2-phenylethyl acetate --- packed-bed reactor --- solvent-free --- cyclic voltammetry --- electrochemical impedance spectroscopy --- carbon nanotubes --- redox mediators --- CYP102A1 --- naringin dihydrochalcone --- neoeriocitrin dihydrochalcone --- regioselective hydroxylation --- n/a --- UGT-SuSy cascade reaction --- whole-cell biocatalysis --- Kramers' theory


Book
Biocatalytic Process Optimization
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Biocatalysis is very appealing to the industry because it allows, in principle, the synthesis of products not accessible by chemical synthesis. Enzymes are very effective, as are precise biocatalysts, as they are enantioselective, with mild reaction conditions and green chemistry. Biocatalysis is currently widely used in the pharmaceutical industry, food industry, cosmetic industry, and textile industry. This includes enzyme production, biocatalytic process development, biotransformation, enzyme engineering, immobilization, the synthesis of fine chemicals and the recycling of biocatalysts. One of the most challenging problems in biocatalysis applications is process optimization. This Special Issue shows that an optimized biocatalysis process can provide an environmentally friendly, clean, highly efficient, low cost, and renewable process for the synthesis and production of valuable products. With further development and improvements, more biocatalysis processes may be applied in the future.

Keywords

Research & information: general --- catechin --- degalloylation --- flavonol --- glycoside hydrolase --- optimization --- tannase --- immobilized DERA --- statin side chain --- continuous flow synthesis --- alginate-luffa matrix --- design of experiments --- Anguilla marmorata --- eel protein hydrolysates --- functional properties --- herbal eel extracts --- agarose --- agarase --- agarotriose --- agaropentaose --- expression --- calycosin --- calycosin-7-O-β-D-glucoside --- glucosyltransferase --- sucrose synthase --- UDP-glucose recycle --- UGT–SuSy cascade reaction --- Candida antarctica lipase A --- surface-display system --- shear rate --- mass transfer rate --- enzymatic kinetic study --- enzymatic synthesis --- β-amino acid esters --- microreactor --- aromatic amines --- Michael addition --- kraft pulp --- cellulose --- xylan --- enzymatic hydrolysis --- Penicillium verruculosum --- glucose --- xylose --- lipase --- acidolysis --- docosahexaenoic acid ethyl ester --- eicosapentaenoic acid ethyl ester --- ethyl acetate --- kinetics --- styrene monooxygenase --- indole monooxygenase --- two-component system --- chiral biocatalyst --- solvent tolerance --- biotransformation --- epoxidation --- NAD(P)H-mimics --- superoxide dismutase (SOD) --- catalase (CAT) --- glutathione reductase (GR) --- aluminum (Al) --- selenium (Se) --- mouse --- brain --- liver --- phosphatidylcholine --- 3,4-dimethoxycinnamic acid --- enzymatic interesterification --- biocatalysis --- Pleurotus ostreatus --- enenzymatic hydrolysis --- peptide --- antioxidant --- hepatoprotective activity --- Yarrowia lipolytica --- whole–cell biocatalysis --- indolizine --- cycloaddition --- trehalose --- viscosity --- enzymes --- protein dynamics --- Kramers’ theory --- protein stabilization --- enzyme inhibition --- Lipase --- transesterification --- 2-phenylethyl acetate --- packed-bed reactor --- solvent-free --- cyclic voltammetry --- electrochemical impedance spectroscopy --- carbon nanotubes --- redox mediators --- CYP102A1 --- naringin dihydrochalcone --- neoeriocitrin dihydrochalcone --- regioselective hydroxylation --- n/a --- UGT-SuSy cascade reaction --- whole-cell biocatalysis --- Kramers' theory


Book
Biocatalytic Process Optimization
Authors: ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Biocatalysis is very appealing to the industry because it allows, in principle, the synthesis of products not accessible by chemical synthesis. Enzymes are very effective, as are precise biocatalysts, as they are enantioselective, with mild reaction conditions and green chemistry. Biocatalysis is currently widely used in the pharmaceutical industry, food industry, cosmetic industry, and textile industry. This includes enzyme production, biocatalytic process development, biotransformation, enzyme engineering, immobilization, the synthesis of fine chemicals and the recycling of biocatalysts. One of the most challenging problems in biocatalysis applications is process optimization. This Special Issue shows that an optimized biocatalysis process can provide an environmentally friendly, clean, highly efficient, low cost, and renewable process for the synthesis and production of valuable products. With further development and improvements, more biocatalysis processes may be applied in the future.

Keywords

catechin --- degalloylation --- flavonol --- glycoside hydrolase --- optimization --- tannase --- immobilized DERA --- statin side chain --- continuous flow synthesis --- alginate-luffa matrix --- design of experiments --- Anguilla marmorata --- eel protein hydrolysates --- functional properties --- herbal eel extracts --- agarose --- agarase --- agarotriose --- agaropentaose --- expression --- calycosin --- calycosin-7-O-β-D-glucoside --- glucosyltransferase --- sucrose synthase --- UDP-glucose recycle --- UGT–SuSy cascade reaction --- Candida antarctica lipase A --- surface-display system --- shear rate --- mass transfer rate --- enzymatic kinetic study --- enzymatic synthesis --- β-amino acid esters --- microreactor --- aromatic amines --- Michael addition --- kraft pulp --- cellulose --- xylan --- enzymatic hydrolysis --- Penicillium verruculosum --- glucose --- xylose --- lipase --- acidolysis --- docosahexaenoic acid ethyl ester --- eicosapentaenoic acid ethyl ester --- ethyl acetate --- kinetics --- styrene monooxygenase --- indole monooxygenase --- two-component system --- chiral biocatalyst --- solvent tolerance --- biotransformation --- epoxidation --- NAD(P)H-mimics --- superoxide dismutase (SOD) --- catalase (CAT) --- glutathione reductase (GR) --- aluminum (Al) --- selenium (Se) --- mouse --- brain --- liver --- phosphatidylcholine --- 3,4-dimethoxycinnamic acid --- enzymatic interesterification --- biocatalysis --- Pleurotus ostreatus --- enenzymatic hydrolysis --- peptide --- antioxidant --- hepatoprotective activity --- Yarrowia lipolytica --- whole–cell biocatalysis --- indolizine --- cycloaddition --- trehalose --- viscosity --- enzymes --- protein dynamics --- Kramers’ theory --- protein stabilization --- enzyme inhibition --- Lipase --- transesterification --- 2-phenylethyl acetate --- packed-bed reactor --- solvent-free --- cyclic voltammetry --- electrochemical impedance spectroscopy --- carbon nanotubes --- redox mediators --- CYP102A1 --- naringin dihydrochalcone --- neoeriocitrin dihydrochalcone --- regioselective hydroxylation --- n/a --- UGT-SuSy cascade reaction --- whole-cell biocatalysis --- Kramers' theory


Book
Molecular Biocatalysis 2.0
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Biotransformation has accompanied mankind since the Neolithic community, when people settled down and began to engage in agriculture. Modern biocatalysis started in the mid-1850s with the pioneer works of Pasteur. Today, biotransformations have become an indispensable part of our lives, similar to other hi-tech products. Now, in 2019, biocatalysis “received” the Nobel Prize in Chemistry due to prof. Frances H. Arnold’s achievements in the area of the directed evolution of enzymes. This book deals with some major topics of biotransformation, such as the application of enzymatic methods in glycobiology, including the synthesis of hyaluronan, complex glycoconjugates of N-acetylmuramic acid, and the enzymatic deglycosylation of rutin. Enzymatic redox reactions were exemplified by the enzymatic synthesis of indigo from indole, oxidations of β-ketoesters and the engineering of a horse radish peroxidase. The enzymatic reactions were elegantly employed in biosensors, such as glucose oxidase, in the case of electrochemical glucose sensors. Nitrilases are important enzymes for nitrile metabolism in plants and microorganisms have already found broad application in industry—here, these enzymes were for the first time described in Basidiomyceta. This book nicely describes molecular biocatalysis as a pluripotent methodology—“A jack of all trades...”—which strongly contributes to the high quality and sustainability of our daily lives.


Book
Molecular Biocatalysis 2.0
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Biotransformation has accompanied mankind since the Neolithic community, when people settled down and began to engage in agriculture. Modern biocatalysis started in the mid-1850s with the pioneer works of Pasteur. Today, biotransformations have become an indispensable part of our lives, similar to other hi-tech products. Now, in 2019, biocatalysis “received” the Nobel Prize in Chemistry due to prof. Frances H. Arnold’s achievements in the area of the directed evolution of enzymes. This book deals with some major topics of biotransformation, such as the application of enzymatic methods in glycobiology, including the synthesis of hyaluronan, complex glycoconjugates of N-acetylmuramic acid, and the enzymatic deglycosylation of rutin. Enzymatic redox reactions were exemplified by the enzymatic synthesis of indigo from indole, oxidations of β-ketoesters and the engineering of a horse radish peroxidase. The enzymatic reactions were elegantly employed in biosensors, such as glucose oxidase, in the case of electrochemical glucose sensors. Nitrilases are important enzymes for nitrile metabolism in plants and microorganisms have already found broad application in industry—here, these enzymes were for the first time described in Basidiomyceta. This book nicely describes molecular biocatalysis as a pluripotent methodology—“A jack of all trades...”—which strongly contributes to the high quality and sustainability of our daily lives.


Book
Molecular Biocatalysis 2.0
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Biotransformation has accompanied mankind since the Neolithic community, when people settled down and began to engage in agriculture. Modern biocatalysis started in the mid-1850s with the pioneer works of Pasteur. Today, biotransformations have become an indispensable part of our lives, similar to other hi-tech products. Now, in 2019, biocatalysis “received” the Nobel Prize in Chemistry due to prof. Frances H. Arnold’s achievements in the area of the directed evolution of enzymes. This book deals with some major topics of biotransformation, such as the application of enzymatic methods in glycobiology, including the synthesis of hyaluronan, complex glycoconjugates of N-acetylmuramic acid, and the enzymatic deglycosylation of rutin. Enzymatic redox reactions were exemplified by the enzymatic synthesis of indigo from indole, oxidations of β-ketoesters and the engineering of a horse radish peroxidase. The enzymatic reactions were elegantly employed in biosensors, such as glucose oxidase, in the case of electrochemical glucose sensors. Nitrilases are important enzymes for nitrile metabolism in plants and microorganisms have already found broad application in industry—here, these enzymes were for the first time described in Basidiomyceta. This book nicely describes molecular biocatalysis as a pluripotent methodology—“A jack of all trades...”—which strongly contributes to the high quality and sustainability of our daily lives.

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