551-85-9Relevant academic research and scientific papers
Chemical Synthesis of Ketopentose-5-phosphates
Wei, Wei-Chih,Chang, Che-Chien
, p. 3033 - 3040 (2017/06/20)
A chemical synthesis of ketopentose-5-phosphates that are involved in the pentose phosphate pathway has been developed. The ketopentose phosphates, d-ribulose-5-phosphate and d-xylulose-5-phosphate, were prepared in five steps starting from known intermed
Facile Enzymatic Synthesis of Phosphorylated Ketopentoses
Wen, Liuqing,Huang, Kenneth,Liu, Yunpeng,Wang, Peng George
, p. 1649 - 1654 (2016/03/15)
An efficient and convenient platform for the facile synthesis of phosphorylated ketoses is described. All eight phosphorylated ketopentoses were produced using this platform starting from two common and inexpensive aldoses (d-xylose and l-arabinose) in more than 84% isolated yield (gram scale). In this method, reversible conversions (isomerization or epimerization) were accurately controlled toward the formation of desired ketose phosphates by targeted phosphorylation reactions catalyzed by substrate-specific kinases. The byproducts were selectively removed by silver nitrate precipitation avoiding the tedious and time-consuming separation of sugar phosphate from adenosine phosphates (ATP and ADP). Moreover, the described strategy can be expanded for the synthesis of other sugar phosphates.
Complete Oxidation of Sugars to Electricity by Using Cell-Free Synthetic Enzymatic Pathways
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Paragraph 0124, (2016/02/16)
The present invention is in the field of bioelectricity. The present invention provides energy generating systems, methods, and devices that are capable of converting chemical energy stored in sugars into useful electricity.
Electrochemical oxidation of sugars at moderate potentials catalyzed by Rh porphyrins
Yamazaki, Shin-Ichi,Fujiwara, Naoko,Takeda, Sahori,Yasuda, Kazuaki
supporting information; experimental part, p. 3607 - 3609 (2010/08/07)
In this communication, we demonstrate that certain kinds of Rh porphyrins on carbon black can electrochemically oxidize aldose at low potentials. The onset potential was much lower than those with the other complex-based catalysts. A product analysis suggested that this reaction involves 2-electron oxidation of the aldehyde group.
Reconstitution and biochemical characterization of a new pyridoxal-5′-phosphate biosynthetic pathway
Burns, Kristin E.,Xiang, Yun,Kinsland, Cynthia L.,McLafferty, Fred W.,Begley, Tadhg P.
, p. 3682 - 3683 (2007/10/03)
The substrates for Bacillus subtilis PLP synthase (YaaD and YaaE) are identified, and the first reconstitution of PLP biosynthesis using this pathway is described. Three partial reactions catalyzed by YaaD are also identified. Copyright
Preparation of D-Glucose 6-Phosphate from Methanol and D-Ribose 5-Phosphate with Methylotrophic Enzymes
Yanase, Hideshi,Sato, Yusuke,Kita, Keiko,Sato, Yoshiyuki,Kato, Nobuo
, p. 308 - 312 (2007/10/02)
Formaldehyde was selectively incorporated into the C-1 position of D-fructose 6-phosphate by condensation with D-ribulose 5-phosphate catalyzed by a partially purified enzyme system for formaldehyde fixation in Methylomonas aminofaciens 77a.Much of the D-fructose 6-phosphate produced in this reaction was converted to D-glucose 6-phosphate by the addition of glucose-6-phosphate isomerase.A fed-batch reaction with periodic additions of the substrates afforded 56.2 g/liter D-glucose 6-phosphate and 26.8 g/liter D-fructose 6-phosphate.When methanol was used as the C1-donor, the yield of D-glucose 6-phosphate was high when alcohol oxidase was added.The optimum conditions for sugar phosphate production in the fed-batch reaction gave 45.6 g/liter D-glucose 6-phosphate and 16.4 g/liter D-fructose 6-phosphate in 165 min.The molar yield of the total sugar phosphates to methanol added was 95percent.The addition of H2O2 and catalase to the reaction system supplied molecular oxygen for methanol oxidation to formaldehyde by alcohol oxidase.
Vanadate tetramer as the inhibiting species in enzyme reactions in vitro and in vivo
Crans,Willging,Butler
, p. 427 - 432 (2007/10/02)
Tetrameric vanadate polyanion inhibits 6-phosphogluconate dehydrogenases from human, mammalian, yeast, and bacterial sources. The inhibition by a vanadate mixture containing monomer, dimer, and tetramer was determined by measuring the rates of 6-phosphogluconate oxidation and NADP (or NAD) reduction catalyzed by 6-phosphogluconate dehydrogenase. The inhibition by vanadate is competitive with respect to 6-phosphogluconate and mixed or noncompetitive with respect to NADP or NAD. 51V NMR spectroscopy was used to direcly correlate the inhibition of vanadate solutions to the vanadate tetramer. The measured inhibition constants with respect to 6-phosphogluconate for the tetramer are 0.078 mM for the human erythrocyte enzyme, 0.063 mM for the sheep liver enzyme, 0.013 mM for the yeast enzyme, and 0.24 mM for the Leuconostoc mesenteroides. The observed inhibition of 6-phosphogluconate dehydrogenase by vanadate tetramer is the first enzymatic activity observed of this polyanion. Our observations suggest the vanadate tetramer will be a potent inhibitor to other organic phosphate converting enzymes and preliminary results confirm this expectation. The vanadate tetramer may be an important species when considering the mechanism by which vanadium acts in biological systems in vitro and in vivo.
Reversible and in Situ Formation of Organic Arsenates and Vanadates as Organic Phosphate Mimics in Enzymatic Reactions: Mechanistic Investigation of Aldol Reactions and Synthetic Applications
Drueckhammer, Dale G.,Durrwachter, J. Robert,Pederson, Richard L.,Crans, Debbie C.,Daniels, Lacy,Wong, Chi-Huey
, p. 70 - 77 (2007/10/02)
A synthetic strategy is developed that uses organic phosphate utilizing enzymes as catalysts and a mixture of an organic alcohol and inorganic arsenate or vanadate to replace the organic phosphate substrate.In this process, inorganic arsenate or vanadate reacts with the alcohol reversibly in situ to form a mixture of esters, one of which is accepted by the enzyme as a substrate.Examples of the utility of this approach are demonstrated in enzymatic aldol condensations catalyzed by fructose-1,6-diphosphate aldolase, fuculose-1-phosphate aldolase, and rhamnulose-1-phosphate aldolase with a mixture of dihydroxyacetone and inorganic arsenate as substrate.Several uncommon sugars and deoxy sugars are prepared on 5-17-mmol scales.Mechanistic studies on an aldol reaction indicate that the redox reaction between dihydroxyacetone and inorganic vanadate prohibits the use of such a mixture to replace dihydroxyacetone phosphate in enzymatic aldol condensations.
Practical Synthesis of 5-Phospho-D-ribosyl α-1-pyrophosphate (PRPP): Enzymatic Routes from Ribose 5-Phosphate or Ribose
Gross, Akiva,Abril, Obsidiana,Lewis Jerome M.,Geresh, Shimona,Whitesides, George M.
, p. 7428 - 7435 (2007/10/02)
This paper describes enzymatic syntheses of 5-phospho-D-ribosyl α-1-pyrophosphate (PRPP) on a 75-mmol scale.The reactions used PAN-immobilized PRPP synthetase as catalyst with in situ ATP-cofactor regeneration.In one procedure pure r-5-P was used as a starting material; in a second, r-5-P was synthesized by ribokinase-catalyzed phosphorilation of D-ribose and used in situ.The potential for use of PRPP as a starting material for the preparation of nucleotides was demonstrated by an enzymatic synthesis of UMP.This paper also describes several methods for the preparation of r-5-P: acid-catalyzed hydrolysis of AMP, acid-catalyzed hydrolysis of crude mononucleotide mixture obtained by digestion of RNA, chemical synthesis from D-ribose, and ribokinase-catalyzed synthesis from D-ribose.Procedures are described for the isolation of PRPP synthetase (from Salmonella typhimurium) and ribokinase (from Lactobacillus plantarum) and for immobilization of these enzymes in PAN.
