Draw the products of the reaction of xylulose-5-phosphate and erythrose-4-phosphate catalyzed by transketolase in the pentose phosphate pathway. Provide the structure in the protonation state found in physiological conditions. H H-OH EO -H H-OH HO- H H OPO3²- Q transketolase Draw glyceraldehyde-3- phosphate H H- H H H CO -OH OH OPO3²- Draw fructose-6- phosphate Q
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- Enolase catalyzes the reversible reaction shown below. Draw the detailed mechanism for the reaction that occurs in gluconeogenesis, namely the reaction of phosphoenolpyruvate to form 2-phosphoglycerate (the reverse direction in the reaction below).Trace the pathway of [1-14C]pyruvate through gluconeogenesis. Use an asterisk to indicate the location of 14C in all intermediates and in the final gluconeogenesis product, glucose. CH₂ -C=0 Coo [1-1C]Pyruvate CH,OPO H-C-OH C-OPO || 1,3-Bisphospho- glycerate ↑ -coo -CH₂ KC=0 -Coo Oxaloacetate CH,OPO H-C-OH COO 3-Phosphoglycerate CH₂ -OPO OP COO Phosphoenolpyruvate CH,OH H-C-OPO COO 2-PhosphoglycerateHexokinase catalyzes the first step of glycolysis, in which glucose is phosphorylated to form glucose‑6‑phosphate. Give two reasons why a Mg2+ cation is required to facilitate this reaction.
- The inilial reactions in the biosynthesis of the amino acid aspartate at 298 K are: Carbamoyphoephate Cartamoyi + phosphate ADP + phoaphate - ATP AO=-12,300 calmol AG-T800 calimol Which of the following statements is gorrect? A) The energy which is released fron the conversion of 1 mole of carbamoyphosphate to carbamoyl+ phosphate (P) in reaction I is sufficient to drive the synthesis of 1 mole of ATP in reaction II. B) AG for the reaction Carbamoyphosphate + Carbamoyl + phosphate is +123 kcalimol. c) AHP for reaction I cannot be detemined trom the information given. D) Al of the above. E) None of the above.In the first stage of glycolysis, fructose-1,6-bisphosphate iscleaved to form glyceraldehyde-3-phosphate and dihydroxyacetone phosphate. The latter molecule can then be converted to glyceraldehyde-3-phosphate. Illustrate themechanisms whereby these reactions occurPropose a mechanism for the conversion of glucose 6-phosphate into fructose 6- phosphate by phosphoglucose isomerase based on the mechanism of triose phosphate isomerase.
- Phosphoglycerate mutase (PGM) catalyzes the interconversion of 3-phosphoglycerate (3PG) and 2-phosphoglycerate (2PG) in the glycolytic and gluconeogenic pathways. a) To what enzyme class does PGM belong? b) There are two distinct classes of PGM, one which is dependent on 2,3-bisphosphoglycerate (2,3-BPG), dPGM, and one which is not, iPGM. dPGM uses acid base chemistry and a phosphorylated histidine residue to interconvert 3PG and 2PG. The dPGM reaction proceeds with formation of 2,3-BPG as an intermediate. Propose a mechanism for the dPGM-catalyzed conversion of 3PG to 2PG that is consistent with this information. c) What is the purpose of 2,3-BPG (i.e., why does dPGM require it)?Describe the reaction and the products that would occur if transketolase acred upon a pentose aldose and a hexose ketose. pentose phosphate pathwayThe glucose/glucose-6-phosphate substrate cycle involves distinct reactions of glycolysis and gluconcogenesis that interconvert these two metabolites. Assume that under physiological conditions, [ATP] = [ADP] and [Pi] =1 mM. Consider the following glycolytic reaction catalyzed by hexokinase: ATP + glucose = AG' = -16.7 kJ/mol ADP + glucose-6-phosphate (a) Calculate the equilibrium constant (K) for this reaction at 298 K, and from that, calculate the maximum [glucose-6-phosphate]/[glucose] ratio that would exist under conditions where the reaction is still thermody- namically favorable. (b) The reverse of this interconversion in gluconeogenesis is catalyzed by glucose-6-phosphatase: glucose-6-phosphate + H,0 = glucose + P, AGr = -13.8 kJ/mol K= 262 for this reaction. Calculate the maximum ratio of [glucose]/ [glucose-6-phosphate] that would exist under conditions where the reaction is still thermodynamically favorable. (c) Under what cellular conditions would both directions in the…
- Write balanced chemical equations for each of the following: (a) anaerobic glycolysis of 1 mole of sucrose, cleaved initially by sucrose phosphorylase; (b) aerobic glycolysis of 1 mole of maltose; (c) fermentation of one glucose residue in starch to ethanol, with the initial cleavage involving a-amylase.Choose the enzyme and cofactors involved in the reaction of fructose-1,6-bisphosphate to fructose-6-phosphate in gluconeogenesis. H H-TOPO Fo HOTH HDH HOH MOTOPOP K E H-TOH H OPO Problem 3 of 17 A B Q D E fructose-1,6-bisphosphatase phosphoglucose isomerase glucose-6-phosphatase phosphoglycerate kinase hexokinaseRefer to Figure, which indicates ∆G for each glycolytic reaction under intracellular conditions. Assume that glyceraldehyde-3-phosphate dehydrogenase was inhibited with iodoacetate, which reacts with its active site cysteine sulfhydryl group. Which glycolytic intermediate would you expect to accumulate most rapidly, and why?