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Topic: Pyruvate decarboxylation

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Pyruvate dehydrogenase - Wikipedia, the free encyclopedia Thiamine pyrophosphate (TPP) is bound to E1, and catalyses the decarboxylation of pyruvate. Pyruvate dehydrogenase (EC 1.2.1.51) is an allosteric enzyme that transforms pyruvate into acetyl-CoA by a process called oxidative decarboxylation. Oxidative decarboxylation is also known as the "pyruvate dehydrogenase reaction" because it is catalyzed by this enzyme. en.wikipedia.org /wiki/Pyruvate_dehydrogenase   (383 words)

Biochemistry Study Questions on Fates of Pyruvate and Pyruvate Dehydrogenase Describe the role of TPP in the oxidative decarboxylation of pyruvate by pyruvate dehydrogenase. Describe the role of TTP in the pyruvate decarboxylase reaction in cells performing alcohol fermentation, giving the details of steps in the "activation" of pyruvate for decarboxylation. Describe the role of the lipoamide prosthetic group of dihydrolipoyl transacetylase in the oxidation of the hydroxyethyl-TPP complex of the pyruvate dehydrogenase complex. www.umsl.edu /~starling/biochem/study/sq-18.htm   (313 words)

Pyruvate Dehydrogenase & Krebs Cycle catalyzes oxidative decarboxylation of pyruvate, to form acetyl-CoA. The sequence of reactions catalyzed by the Pyruvate Dehydrogenase complex is summarized in Fig. What was the keto carbon of pyruvate is oxidized to a carboxylic acid, as the disulfide of lipoamide is reduced to a dithiol. www.rpi.edu /dept/bcbp/molbiochem/MBWeb/mb1/part2/krebs.htm   (792 words)

The TCA Cycle During the course of the reaction the acetyl group derived from decarboxylation of pyruvate is bound to TPP. During the oxidation of pyruvate to CO by pyruvate dehydrogenase the electrons flow from pyruvate to the lipoamide moiety of dihydrolipoyl transacetylase then to the FAD cofactor of dihydrolipoyl dehydrogenase and finally to reduction of NAD The pyruvate dehydrogenase activities of the PDH complex are regulated by their state of phosphorylation. web.indstate.edu /thcme/mwking/tca-cycle.html   (2256 words)

Mitochondrial Products for PDH (pyruvate dehydrogenase) It is localized in the matrix space of mitochondria where it catalyzes the irreversible oxidative decarboxylation of pyruvate entering the organelle to produce acetyl-CoA, NADH and CO2. Pyruvate dehydrogenase is a heterotetramer of two alpha and two beta subunits and the activity of this enzyme is regulated by a specific E1 kinase and phospho-E1-phosphatase, which respectively phophorylate and dephosphorylate the enzyme. The pyruvate dehydrogenase complex (PDH) is at the centre of aerobic carbohydrate metabolism. www.mitosciences.com /pdh.html   (485 words)

Pyruvate Dehydrogenase pyruvate-lipoamide-E2 This reaction is actually a two-step process involving the binding of pyruvate to thiamine pyrophosphate (TPP) and the subsequent decarboxylation of pyruvate, leading to a resonance stabilized carbanion intermediate that is hydrated to form hdyroxyethyl-TPP. The role of the individual subunits (alpha and beta) of the pyruvate dehydrogenase enzyme is still speculative, but it is proposed that both participate in the binding of thiamine pyrophosphate (3). Pyruvate is then converted into acetyl-CoA which enters the TCA (tricarboxylic acid) cycle in the mitochondria. www.arches.uga.edu /~sbaas   (436 words)

Pyruvate Dehydrogenase pyruvate-lipoamide-E2 This reaction is actually a two-step process involving the binding of pyruvate to thiamine pyrophosphate (TPP) and the subsequent decarboxylation of pyruvate, leading to a resonance stabilized carbanion intermediate that is hydrated to form hdyroxyethyl-TPP. The role of the individual subunits (alpha and beta) of the pyruvate dehydrogenase enzyme is still speculative, but it is proposed that both participate in the binding of thiamine pyrophosphate (3). Pyruvate is then converted into acetyl-CoA which enters the TCA (tricarboxylic acid) cycle in the mitochondria. www.arches.uga.edu /~sbaas   (436 words)

Plant Gene Register PGR98-192 The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to yield acetyl-CoA and NADH. In plants, pyruvate dehydrogenase kinase has been proposed to down-regulate the pyruvate dehydrogenase complex and hence the Krebs cycle when substrates other than pyruvate are oxidized (Budde and Randall, 1990; Gemel and Randall, 1992). The pyruvate dehydrogenase kinase subunit of the mitochondrial pyruvate dehydrogenase complex. www.tarweed.com /pgr/PGR98-192.html   (436 words)

The TCA Cycle During the course of the reaction the acetyl group derived from decarboxylation of pyruvate is bound to TPP. During the oxidation of pyruvate to CO by pyruvate dehydrogenase the electrons flow from pyruvate to the lipoamide moiety of dihydrolipoyl transacetylase then to the FAD cofactor of dihydrolipoyl dehydrogenase and finally to reduction of NAD The pyruvate dehydrogenase activities of the PDH complex are regulated by their state of phosphorylation. web.indstate.edu /thcme/mwking/tca-cycle.html   (2256 words)

Metabolic Control Analysis of Eucaryotic Pyruvate Dehydrogenase Multienzyme Complex At high pyruvate concentrations, the control is shared by all of the components, with E1 having a negative influence while the other three components, E2, X, and K, exert a positive control over the pyruvate decarboxylation rate. At high pyruvate levels, PDH components are shown to exert a higher degree of control when reactions are taking place inside the cells as compared to the in vitro situation. While pyruvate dilution effects are shown to be negligible under all conditions, significant PDH complex dilution effects are observed under certain conditions. pubs.acs.org /cgi-bin/abstract.cgi/bipret/2002/18/i06/abs/bp025613p.html   (376 words)

Pyruvate Pyruvate Dehydrogenase catalyzes oxidative decarboxylation of pyruvate, to form acetyl-CoA. Pyruvate kinase deficiency is an inherited deficiency of the enzyme pyruvate kinase, which is used by red blood cells. Pyruvate Dehydrogenase Complex Deficiency - Pyruvate dehydrogenase complex deficiency (PDCD) is one of the most common neurodegenerative disorders associated... teknodata.com /teksub/Pyruvate.html   (376 words)

The Scientist : Evidence for organelle origin ovalis is quite different from other hydrogenosome-bearing organisms in that it belongs to a clade in which mitochondria are common and apparently uses pyruvate dehydrogenase instead of pyruvate ferredoxin oxidoreductase for oxidative decarboxylation. Patricia Johnson of the University of California at Los Angeles, who did not participate in this study, noted the distribution of hydrogenosomes throughout the eukaryotic family tree "strongly suggests they arose multiple times independent of each other." www.biomedcentral.com /news/20050303/01   (676 words)

Pfam 18.0 : POR This involves the oxidative decarboxylation of pyruvate with the participation of thiamine followed by the transfer of an acetyl moiety to coenzyme A for the synthesis of acetyl-CoA MEDLINE:8550425. This involves the oxidative decarboxylation of pyruvate with the participation of thiamine followed by the transfer of an acetyl moiety to coenzyme A for the synthesis of acetyl-CoA [1]. Pyruvate oxidoreductase (POR) catalyses the final step in the fermentation of carbohydrates in anaerobic microorganisms MEDLINE:8550425. pfam.wustl.edu /cgi-bin/getdesc?name=POR   (676 words)

Dorlands Medical Dictionary The enzyme catalyzes the oxidative decarboxylation of pyruvate, forming acetyl bound to the cofactor thiamine pyrophosphate; the acetyl is subsequently transferred to lipoamide to form acetyldihydrolipoamide, an intermediate in the overall reaction catalyzed by the complex. Pyruvate can be converted to acetyl coenzyme A, which can enter the tricarboxylic acid cycle for aerobic production of energy or be used for fatty acid synthesis. Pyruvate is the end product of glycolysis, and it in turn may be converted to lactate or acetyl CoA or to ethanol (as in yeasts). www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_p_44zPzhtm   (2573 words)

Thiamine and salts (PIM G015) Thiamine pyrophosphate functions in carbohydrate metabolism as a coenzyme in the decarboxylation of alpha - keto acids, such as alpha - keto glutarate and pyruvate, and in the utilization of pentose in the hexose monophosphate shunt. In the carbohydrate metabolism, it functions as a coenzyme in the decarboxylation of alpha - keto acids such as pyruvate and alpha - keto glutarate, and in the hexose monophosphate shunt. The physiologically active form of thiamine is the thiamine pyrophosphate. www.inchem.org /documents/pims/pharm/pimg015.htm   (2573 words)

Biochemistry Study Questions on Fates of Pyruvate and Pyruvate Dehydrogenase Describe the role of TPP in the oxidative decarboxylation of pyruvate by pyruvate dehydrogenase. Describe the role of TTP in the pyruvate decarboxylase reaction in cells performing alcohol fermentation, giving the details of steps in the "activation" of pyruvate for decarboxylation. Describe the role of the lipoamide prosthetic group of dihydrolipoyl transacetylase in the oxidation of the hydroxyethyl-TPP complex of the pyruvate dehydrogenase complex. www.umsl.edu /~starling/biochem/study/sq-18.htm   (313 words)

Formation of Acetyl-CoA through the Transition Reaction Through a process called oxidative decarboxylation, the transition reaction converts the two molecules of the 3-carbon pyruvate from glycolysis (and other pathways) into two molecules of the 2-carbon molecule acetyl Coenzyme A (acetyl-CoA) and 2 molecules of carbon dioxide. As the two pyruvates undergo oxidative decarboxylation, two molecules of NAD First, a carboxyl group of each pyruvate is removed as carbon dioxide and then the remaining acetyl group combines with coenzyme A (CoA) to form acetyl-CoA. www.cat.cc.md.us /courses/bio141/lecguide/unit4/metabolism/cellresp/transit.html   (282 words)

Process for producing pyruvic acid - Patent 4247716 In general, the pyruvates are poor in thermal stability, and it is difficult to separate the solid pyruvate from the reaction solution obtained by oxidation of hydroxyacetone only by evaporating the pyruvate-containing aqueous solution to dryness since it suffers from decomposition or decarboxylation, resulting frequently in side production of acetate or polymers. The catalyst was filtered off from the reaction solution and then the concentration of pyruvic acid in the reaction solution was quantitatively determined by a high speed liquid chromatography, revealing that 14.0 g of sodium pyruvate and 2 g of sodium acetate were produced. A novel process for producing pyruvic acid is provided in which process hydroxyacetone is oxidized with a molecular oxygen-containing gas in a water-containing or aqueous solvent in the presence of a catalyst. www.freepatentsonline.com /4247716.html   (4450 words)

BIFC 3521: Lecture The pyruvate dehydrogenase enzyme complex catalyzes the conversion of pyruvate to acetyl CoA via oxidative decarboxylation (see PDH Reaction and CoA Structure). The CoA produced as a product can be reutilized to produce more acetyl CoA via pyruvate dehydrogenase. These latter effects of acetyl CoA and NADH can be counteracted by excess amounts of NAD+ and coenzyme A, substrates of the complex. www.library.csi.cuny.edu /~davis/Biochem_3521/lect17/lect17.html   (1939 words)

Krebscycle This mechanism is almost as same as the reaction of the oxidative decarboxylation of pyruvate to acetyl CoA by pyruvate dehydrogenase complex. students.ou.edu /R/Ben.A.Rodriguez-1/Krebscycle.html   (1939 words)

BIFC 3521: Lecture The pyruvate dehydrogenase enzyme complex catalyzes the conversion of pyruvate to acetyl CoA via oxidative decarboxylation (see PDH Reaction and CoA Structure). Succinate dehydrogenase (SDH) is the third of four oxidation-reduction reactions in the cycle. Although the reaction is endergonic, the rapid removal of oxaloacetate by citrate synthetase and oxidation of NADH by the respiratory chain (Chpt 21) pulls the reaction to the right. www.library.csi.cuny.edu /~davis/Biochem_3521/lect17/lect17.html   (1939 words)

The chemical logic behind... the citric acid cycle We can predict that it will react like pyruvate, i.e., that its decarboxylation may yield enough energy to enable the formation of a thioester bond with coenzyme A. And this indeed occurs... If citrate had not been isomerized to isocitrate, this decarboxylation would yield a branched carbon compound, much harder to metabolize. Citrate is then isomerized to isocitrate, which is then decarboxylated to www2.ufp.pt /~pedros/bq/tca.htm   (409 words)

JYI: A Putative Pyruvate: Ferredoxin Oxidoreductase Gene in Chlamydomonas reinhardtii is Expressed under Hydrogen Production Conditions Experimental evidence that a larger percentage of pyruvate is decarboxylated to acetyl-coA in C. reinhardtii fermentative metabolism led Healey (1970) to theorize that the oxidative decarboxylation of pyruvate to acetyl-coA produces hydrogenase reductant (Bamberger et al. Chlamydomonas reinhardtii strain cc849 (cell wall-less) was grown in 1-liter Roux flasks photoheterotropically in TAP liquid medium (Harris 1989) supplemented with sterile 5% CO2 in air. reinhardtii has a dynamic metabolism, and is able to regulate biochemical pathways to obtain energy and recycle necessary cofactors in response to changes in growth conditions (Klein and Betz 1978; Ohta and Miura 1987; Geffler and Gibbs 1984). www.jyi.org /volumes/volume11/issue1/articles/meuser.html   (3177 words)

CHE 415 - General Biochemistry I - Lecture 21, Glycolysis and the Citric Acid Cycle   This is the first removal of CO from the substrate within the Citric Acid Cycle, and the second overall (the first being the decarboxylation of pyruvate to acetyl CoA by pyruvate dehydrogenase). 9)  The initiating reaction of the Citric Acid Cycle is the condensation of oxaloacetate and acetyl CoA by the enzyme citrate synthase to form citric acid, with citryl CoA as an enzyme-bound intermediate. 10)  Citrate is isomerized as the next step in the Citric Acid Cycle to form isocitrate; the isomerization involves moving the hydroxyl from the center carbon atom to one of the adjacent methylene groups, through a dehydrated intermediate called cis-aconitate. people.uis.edu /efish1/Che415/Lectur21/lectur21.htm   (1975 words)

Describe three effects that account for the thermodynamic driving force for the hydrolysis of ATP (phospho Acetyl CoA, the starting material for fatty acid synthesis, is generated in the mitochondrion by the oxidative decarboxylation of pyruvate (catalyzed by pyruvate dehydrogenase). Fatty acid synthesis should slow down because acetyl CoA would not be transported from the mito to the cytosol where fatty acid biosynthesis occurs. In the cytosol, citrate lyase catalyzes transfer of the acetyl group from citrate to CoA forming acetyl CoA and oxaloacetate. www.uaf.edu /chem/451f00D/Q3_key.htm   (1975 words)

Reactome: acetyl group - Oxidative decarboxylation of pyruvate to acetyl CoA by pyruvate dehydrogenase - glutamate + acetyl CoA => N-acetyl glutamate + CoA [Homo sapiens] [Rattus norvegicus] [Fugu rubripes] [Danio rerio] - HMG CoA => acetoacetic acid+ acetyl CoA [Homo sapiens] [Mus musculus] [Rattus norvegicus] [Gallus gallus] [Fugu rubripes] [Danio rerio] reactome.org /cgi-bin/eventbrowser?DB=gk_current&...+gallus&ID=114992   (1975 words)

The TCA Cycle During the course of the reaction the acetyl group derived from decarboxylation of pyruvate is bound to TPP. The pathway of PDH oxidation of pyruvate to acetyl-CoA is diagrammed below. The transfer of the acetyl group from acyl-lipoamide to CoA results in the formation of 2 sulfhydryl (SH) groups in lipoate requiring reoxidation to the disulfide (S-S) form to regenerate lipoate as a competent acyl acceptor. web.indstate.edu /thcme/mwking/tca-cycle.html   (2256 words)

Probing the Origin of Acetyl-CoA and Oxaloacetate Entering the Citric Acid Cycle from the 13C Labeling of Citrate Released by Perfused Rat Hearts -- Comte et al. 272 (42): 26117 -- Journal of Biological Chemistry of pyruvate decarboxylation and octanoate oxidation to the acetyl acetyl and OAA moieties of citrate and of (ii) pyruvate. The M1 enrichment of the acetyl moiety of citrate was obtained from Equation 18. www.jbc.org /cgi/content/full/272/42/26117   (5995 words)

New Page 1 This is also a proton consuming decarboxylation reaction in the cytosol that consumes protons, and replaces the pyruvate dehydrogenase reaction, a proton generating decarboxylation reaction, in the mitochondria. The acetaldehyde produced by the PDC reaction, is then converted into acetate by an acetaldehyde dehydrogenase [EC 1.2.1.10] either in the cytosol leading to acetate uptake into the mitochondria, or the acetaldehyde which is a membrane permeable molecule moves into the mitochondria, and is there converted into acetate. The succinate semialdehyde produced by GABA aminotransferase is reduced to succinate by succinate semialdehyde dehydrogenase [EC This enzyme has been purified and characterized from Arabidopsis (Busch and Fromm, 1999; Busch et al., 2000). www.auburn.edu /~locyrob/teaching/biol7240/gaba/gaba01.html   (609 words)

References - C4 - HORT640 - Metabolic Plant Physiology - Department of Horticulture and Landscape Architecture - Purdue University Burnell JN, Hatch MD 1988 Photosynthesis in phosphoenolpyruvate carboxykinase-type C4 plants: pathways of C4 acid decarboxylation in bundle sheath cells of Urochloa panicoides. Windhovel A, Hein I, Dabrowa R, Stockhaus J 2001 Characterization of a novel class of plant homeodomain proteins that bind to the C4 phosphoenolpyruvate carboxylase gene of Flaveria trinervia. Matsuoka M 1995 The gene for pyruvate, orthophosphate dikinase in C4 plants: structure, regulation and evolution. www.hort.purdue.edu /rhodcv/hort640c/referen/C4.htm   (609 words)

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