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5 - enzymic synthesis

As stated earlier (see p. 342), study of the cell-free, enzymic synthesis of dextran was initiated by Hehre and Sugg They demonstrated the ability of a cell-free extract of Leuconostoc mesenteroidea to catalyze the formation of dextran. The over-all reaction was represented by equation (1). In addi- [Pg.355]

One of the main characteristics of this enzyme system is the unique role played by sucrose as the donor of D-glucosyl groups. Even the closely allied isomer, a-D-galactopyranosyl /3-n-fructofuranoside is inactive in this enzymic reaction. The results of work on the enzymic synthesis of starch from D-glucosyl phosphate raised a question as to whether a phosphoryla- [Pg.361]

Kinetic evidence indicated, also, that a siimdtaneous binding of the acceptor and donor must take place before polymerization occurs. Binding of the donor (sucrose) on the acceptor site causes inhibition and excess acceptor, in the presence of a low concentration of sucrose, oZso causes inhibition (because of competitive interaction of the acceptor and sucrose for the donor site). Any mechanism that is postulated for this reaction must, therefore, include a three-component complex— between the enzyme and both substrates. [Pg.364]

The following mechanism is a slight modification of the scheme proposed by Bovey for explaining the enzymic synthesis of dextran. The step con- [Pg.365]

The dextrans have been proposed for use in a number of industrial and medical applications. The greatest single use has, however, been in the latter field, where partially hydrolyzed dextrans have been used as substi- [Pg.366]


The dopamine is then concentrated in storage vesicles via an ATP-dependent process. Here the rate-limiting step appears not to be precursor uptake, under normal conditions, but tyrosine hydroxylase activity. This is regulated by protein phosphorylation and by de novo enzyme synthesis. The enzyme requites oxygen, ferrous iron, and tetrahydrobiopterin (BH. The enzymatic conversion of the precursor to the active agent and its subsequent storage in a vesicle are energy-dependent processes. [Pg.517]

Microorganisms exhibit nutritional preferences. The enzymes for common substrates such as glucose are usually constitutive, as are the enzymes for common or essential metabohc pathways. Furthermore, the synthesis of enzymes for attack on less common substrates such as lactose is repressed by the presence of appreciable amounts of common substrates or metabolites. This is logical for cells to consei ve their resources for enzyme synthesis as long as their usual substrates are readily available. If presented with mixed substrates, those that are in the main metabolic pathways are consumed first, while the other substrates are consumed later after the common substrates are depleted. This results in diauxic behavior. A diauxic growth cui ve exhibits an intermediate growth plateau while the enzymes needed for the uncommon substrates are synthesized (see Fig. 24-2). There may also be preferences for the less common substrates such that a mixture shows a sequence of each being exhausted before the start of metabolism of the next. [Pg.2133]

Enzymic and Chemical Synthesis of the a-l 2-glucosidic Linkage Enzymic Synthesis, S. A. Barker, E. J. Bourne, P. M. Grant, andM. Stacey, Nature, 178(1956) 1221-1223. [Pg.30]

Studies of Aspergillus niger. Part XI. Enzymic Synthesis of a Pseudoaldobiuronic Acid, S. A. Barker, A. Gomez-Sanchez, and M. Stacey,/. Chem. Soc., (1959) 3264- 3269. [Pg.33]

On the other hand, as mentioned in the preceding subsection, a preparative-scale enzymic synthesis of 1-deoxy-D-r/ireo-pentulose can be achieved, according to Reaction 1, in the presence of an extract of B. pumilus. Obviously, this raises the question of the relevance of Eq. 1 to the production of the pentulose in microorganisms. Acetoin in Reaction 1 could be replaced by 3-hydroxy-3-methyl-2-butanone (then the by-product is acetone). More interestingly, it can be also replaced by pyruvate, then the pentulose is synthesized according to Reaction 3 ... [Pg.283]

AA biosynthesis. At an ever deeper level it is possible that high concentrations of the product AA can inhibit expression of the gene for formation of the RNA needed for enzyme synthesis. This form of suppression of gene action over many generations could lead to loss of the gene, causing the AA to become an essential amino acid. [Pg.198]

The absolute quantity of an enzyme reflects the net balance between enzyme synthesis and enzyme degradation, where 4 and represent the rate constants for the overall processes of synthesis and degradation, respectively. Changes in both the 4 and of specific enzymes occur in human subjects. [Pg.74]

Ghanges in the availability of substrates are responsible for most changes in metabolism either directly or indirectly acting via changes in hormone secretion. Three mechanisms are responsible for regulating the activity of enzymes in carbohydrate metabolism (1) changes in the rate of enzyme synthesis, (2) covalent modification by reversible phosphorylation, and (3) allosteric effects. [Pg.155]

Induction Repression of Key Enzyme Synthesis Requires Several Hours... [Pg.155]

Lipogenesis is regulated at the acetyl-CoA carboxylase step by allosteric modifiers, phosphorylation/de-phosphorylation, and induction and repression of enzyme synthesis. Citrate activates the enzyme, and long-chain acyl-CoA inhibits its activity. Insulin activates acetyl-CoA carboxylase whereas glucagon and epinephrine have opposite actions. [Pg.179]

The nature of the molecular defect Is unclear and presumably lies In the repression mechanism for the gene controlling formation of the enzyme protein. Exposure to any of the drugs listed In Table V results In further marked de-repressIon of enzyme synthesis and severe porphyria. [Pg.277]

DRUGS INDUCING MARKED DE-REPRESSION OF ENZYME SYNTHESIS... [Pg.278]

Rhodophyta, Rhodophyceae, Ceramales, Rhodomelaceae). Aust. J. Chem. 42 1591-1603. Collins, F. W., De Luca, V., Ibrahim, R. K., Voirin, B. and Jay, M. 1981. Polymethylated flavonols of Chrysosplenium americanum. I. Identification and enzymic synthesis. Zeit. Naturforsch. 36c 730-736. [Pg.307]

Mercenier A, J-P Simon, CV Wauven, D Haasm, V Stalon (1980) Regulation of enzyme synthesis in the arginine deiminase pathway of Pseudomonas aeruginosa. J Bacteriol 144 159-163. [Pg.331]

Katayama, Y. Fukuzumi, T. Enzymic synthesis of three lignin-related dimers by an improved peroxidase-hydrogen peroxide system. Mokuzai Gakkaishi 1978,24,664-667. [Pg.412]

Target tissue response Synthesis of new enzymes Modification of existing enzymes Synthesis of new enzymes Modification of existing enzymes... [Pg.113]

Hubl, U. and Stevenson, D.E. (2001) In vitro enzymic synthesis of mammalian liver xenobiotic metabolites catalyzed by ovine liver microsomal cytochrome P450. Enzyme and Microbial Technology, 29, 306-311. [Pg.226]

One of the recent fundamental advances in carbohydrate chemistry has been enzymic synthesis in vtiro this has now been realized with dextran8 and with levan.8 However, since phosphate sugars are not involved in the enzymic syntheses of these two bacterial polysaccharides, it is obvious that phosphorylation is just one process for the natural synthesis of polysaccharides. [Pg.222]


See other pages where 5 - enzymic synthesis is mentioned: [Pg.47]    [Pg.17]    [Pg.339]    [Pg.463]    [Pg.608]    [Pg.128]    [Pg.16]    [Pg.29]    [Pg.30]    [Pg.31]    [Pg.31]    [Pg.32]    [Pg.35]    [Pg.35]    [Pg.298]    [Pg.74]    [Pg.74]    [Pg.129]    [Pg.223]    [Pg.168]    [Pg.153]    [Pg.158]    [Pg.159]    [Pg.203]    [Pg.567]    [Pg.220]    [Pg.233]    [Pg.233]    [Pg.234]   
See also in sourсe #XX -- [ Pg.19 , Pg.23 , Pg.263 , Pg.305 ]

See also in sourсe #XX -- [ Pg.5 , Pg.6 , Pg.8 , Pg.9 , Pg.17 , Pg.25 , Pg.26 , Pg.29 , Pg.30 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.35 , Pg.36 , Pg.37 , Pg.38 , Pg.39 , Pg.40 , Pg.41 , Pg.42 , Pg.43 , Pg.44 , Pg.45 , Pg.46 , Pg.47 , Pg.324 ]

See also in sourсe #XX -- [ Pg.14 ]

See also in sourсe #XX -- [ Pg.598 ]




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5 - , enzymic synthesis isolation

Activation of enzyme synthesis

Adenosine 5 - , enzymic synthesis

Alcohols synthesis, via enzyme reduction

Aldolase Enzymes for Complex Synthesis

Aleurone layer enzyme synthesis

Alkaline phosphatase enzyme protein synthesis

Amino acid synthesis enzyme multiplicity

An Overview of Enzymes Used in Chiral Synthesis

Angiotensin-converting enzyme synthesis

Application of Biosynthetic Enzymes in HS and Heparin Oligosaccharide Synthesis

Asymmetric synthesis enzyme-mediated

Asymmetric synthesis using enzymes

Bile acid synthesis, regulation enzyme

Bioelectrocatalyzed Synthesis by Wired Enzyme Assemblies

Branching enzyme, polysaccharide synthesis

Carbohydrates, enzymic synthesis

Carbohydrates, enzymic synthesis from fatty acids

Carbohydrates, enzymic synthesis metabolism

Catabolite repression enzyme synthesis

Catalytic activity, enzymes carbohydrate synthesis

Catalytic asymmetric synthesis enzyme selection

Cell cycle enzyme synthesis

Cell-free enzyme synthesis

Cellulose synthesis, enzymic

Chemical-enzymic synthesis

Chemo-enzymic synthesis

Chiral synthesis, using enzymes

Combined Syntheses Employing Several Enzymes

Complex Enzyme Systems into Membranes in the Absence of Phospholipid Synthesis

Cystathionine enzymic synthesis

Cytidine 5 - , enzymic synthesis

DNA-directed enzyme synthesis

Deoxyribonucleic acid enzymic synthesis

Deoxyribonucleoside, synthesis, enzymes

Derepression of enzyme synthesis

Disaccharides enzymic synthesis

Drug synthesis redox enzymes

ENZYMES IN CARBOHYDRATE SYNTHESIS

Enantioselective synthesis using enzymes

Engineering of Enzymes for Peptide Synthesis and Activation

Enzymatic synthesis Escherichia coli enzyme

Enzymatic synthesis enzyme activity

Enzymatic synthesis using chemically modified enzyme

Enzyme Processes the Evolution from Degradation to Synthesis. Biocatalysis in Aqueous and Non-conventional Media

Enzyme Synthesis and Degradation

Enzyme catalysis polyester synthesis

Enzyme inhibitors synthesis

Enzyme involved in synthesis and repair

Enzyme of fatty acid synthesis

Enzyme responsive polymers enzymatic synthesis

Enzyme substrates, synthesis

Enzyme synthesis cytokinins

Enzyme synthesis gibberellins

Enzyme synthesis of lethal substance

Enzyme synthesis, control

Enzyme synthesis, genetic control

Enzyme-Catalyzed Synthesis of Polyamides and Polypeptides

Enzyme-catalyzed pheromone synthesis

Enzyme-catalyzed polymerization polyaniline synthesis

Enzyme-catalyzed synthesis

Enzyme-catalyzed synthesis of amino acid derivatives

Enzyme-mediated decarboxylation reactions organic synthesis

Enzyme-mediated glycopeptide synthesis

Enzyme-responsive polymers properties, synthesis and applications

Enzymes Aspartame synthesis

Enzymes as Tools for Glycopeptide Synthesis

Enzymes catalyzed polymer synthesis

Enzymes in fatty acid synthesis

Enzymes in organic synthesis

Enzymes in starch synthesis

Enzymes involved in synthesis

Enzymes melanin synthesis

Enzymes nicotine synthesis

Enzymes nucleotide synthesis

Enzymes of TAG Synthesis

Enzymes peptide synthesis

Enzymes semisynthetic, synthesis

Enzymes synthesis

Enzymes synthesis by, of glycogen and starch

Enzymes synthesis of sucrose and other disaccharides

Enzymes, carbohydrate synthesis

Enzymes, chemical synthesis

Enzymes, in synthesis

Enzymes, synthesis with

Enzymic Reactions and Asymmetric Synthesis

Enzymic Synthesis of Bacterial Polysaccharides from Modified Precursors

Enzymic Synthesis of Dextran

Enzymic Synthesis of Glycosides

Enzymic Synthesis of Oligosaccharides

Enzymic Synthesis of Polysaccharides

Enzymic methods synthesis

Enzymic oligosaccharide synthesis

Enzymic synthesis chain length

Enzymic synthesis hydrolysis

Enzymic synthesis hydroquinone

Enzymic synthesis, from modified precursors

Enzymic synthesis, of glycosyl esters

Genetic Control of Enzyme Synthesis

Genetics and regulation of enzyme synthesis

Germination enzyme synthesis during

Glucans, synthesis enzymes catalyzing

Glucopyranose enzymic synthesis

Glutamate, synthesis enzymes responsible

Glycoconjugate synthesis, multi-enzyme

Glycoconjugate synthesis, multi-enzyme systems

Glycogens enzymic synthesis

Glycosides enzymic synthesis

Guanosine 5 - , enzymic synthesis

Heme synthesis, enzymes

Inducers enzyme synthesis affected

Induction of enzyme synthesis

Inhibition of enzyme synthesis

Inosine 5 - , enzymic synthesis

Key Building Blocks via Enzyme-Mediated Synthesis

Levan enzymic synthesis

Lysosomal enzymes synthesis

MPEG-Supported Syntheses Using Enzymes

Malic enzyme synthesis

Malic enzyme, fatty acid synthesis

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Nucleic acid, enzymic synthesis

Nucleosides 5 -pyrophosphates, enzymic synthesis

Oligosaccharides enzyme-based synthesis

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Other Enzymes Involved in Starch Synthesis

Other enzymes and proteins involved in cellulose synthesis

Pentulose enzymic synthesis

Peptide synthesis, enzyme-catalyzed

Pesticides inhibiting enzymes in nucleic acid synthesis

Phosphate esters enzymic synthesis

Phytochelatins, enzyme synthesis

Polyanilines, synthesis enzyme-catalyzed polymerization

Polyesters enzymic synthesis

Polysaccharides enzymic synthesis

Polysaccharides enzymic synthesis, from modified

Polysaccharides synthesis with enzymes

Porphyrin synthesis enzymes

Protein synthesis enzyme catalysis

Protein synthesis enzymes

Raffinose enzymic synthesis

Reactions with enzymic synthesis

Release synthesis, enzyme-induced

Repression of enzyme synthesis

Slow-acting hormones changes in enzyme synthesis

Sodium channels synthesis, enzymic

Starch, /3-amylase action enzymic synthesis

Starches enzymic synthesis

Substrates, Vitamins, and Enzymes Involved in the Synthesis of ALA

Sucrose enzymic synthesis

Surfactants synthesis using enzymes

Synthesis enzyme covalent intermediate

Synthesis enzymic reduction

Synthesis of PANI Using Enzymes Different From HRP

Synthesis of Surfactants Using Enzymes

Synthesis of, enzymes

Templated Synthesis of Enzyme Mimics How Far Can We Go

Tetrapyrrole synthesis enzymes

The Uses of Glycoprocessing Enzymes in Synthesis

Thiamine Diphosphate-Dependent Enzymes Multi-purpose Catalysts in Asymmetric Synthesis

Thymidine enzymic synthesis

Thymidine pyrophosphate), enzymic synthesis

Tryptophan enzyme synthesis regulation

Uridine 2 -deoxy-, 5 - , enzymic synthesis

Uridine enzymic synthesis

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