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- Propose a mechanism for the conversion of glucose 6-phosphate into fructose 6- phosphate by phosphoglucose isomerase based on the mechanism of triose phosphate isomerase.Refer to Figure, which indicates ΔG 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?The clinical symptoms of two forms of galactosemia—deficiency of galactokinase or of UDPglucose: galactose 1-phosphate uridylyltransferase—show radically different severity. Although both types produce gastric discomfort after milk ingestion, deficiency of the transferase also leads to liver, kidney, spleen, and brain dysfunction and eventual death. What products accumulate in the blood and tissues with each type of enzyme deficiency? Estimate the relative toxicities of these products from the above information.
- If glucokinase has a higher Km for glucose than does hexokinase, but can only bind to D-glucose, while hexokinase can bind to several hexose sugars (like D-glucose, D-mannose, and D-fructose), then: glucokinase has both a higher affinity and a higher specificity for D-glucose than does hexokinase glucokinase has both a lower affinity and a lower specificity for D-glucose than does hexokinase glucokinase has a higher affinity but a lower specificity for D-glucose than does hexokinase glucokinase has a lower affinity but a higher specificity for D-glucose than does hexokinase all of the aboveConsider the complete oxidation of one mole of simple TAG containing behenic acid residues (22:0). II. What is the net ATP yield for the complete oxidation of all the fatty acid residues of the simple TAG? (Note: glycerol backbone is not included)1. Consider the oxidation of the fatty acid with the common name arachidic acid. a. Draw the structure of arachidic acid. b. How many turns of the fatty acid oxidation cycle is required for the complete oxidation of arachidic acid? c. How many moles of ATP are formed from one mole of arachidic acid if the acetyl CoA produced go to the citric acid cycle and oxidative phosphorylation? Assume 1 mole of NADH is equivalent to 3 moles ATP and 1 mole FADH2 is equivalent to 2 moles of ATP. Show how you arrived at your answer
- Draw a schematic illustration of the hydrolysis of N-acetylphenylalaninamide catalyzed byalpha-chymotrypsin in which you indicate the important catalytic residues in the active site and how thesubstrate undergoes transformation to products through two different tetrahedral intermediates.When the identical subunits of chicken liver fatty acid synthase are dissociated in vitro, all of the activities can be detected in the separated subunits except for the β-ketoacyl synthase reaction and the overall synthesis of palmitate. Explain these observations.Using the principles described in the text regarding pyridoxal phosphate mechanisms, propose a mechanism for the reaction catalyzed by serine hydroxymethyltransferase.
- A common procedure for determining the effectiveness of compounds as precursors of glucose in mammals is to starve the animal until the liverglycogen stores are depleted and then administer the compound in question. A substrate that leads to a net increase in liver glycogen is termed glucogenic, because it must first be converted to glucose 6-phosphate. Show by means of known enzymatic reactions which of the following substances are glucogenic.The archaebacterium Haloarcula marismortui can use acetate (which is converted to acetyl-CoA) as a precursor for carbohydrate synthesis, but it lacks isocitrate lyase and therefore cannot use the glyoxylate pathway. Instead, it converts isocitrate to α-ketoglutarate, which is then converted to the amino acid methylaspartate in two more steps. This five-carbon compound is modifi ed and broken down to release glyoxylate. Describe the three reactions that lead from isocitrate to methylaspartate.1) Sketch out the schematic diagram for the enzymatic mechanism of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) Please provide the structure of the functional groups of the substrate and enzyme involved in the reaction at each step (rest of the structure can be indicated as R) Indicate clearly the flow of the electrons at each step Indicate in short form the cofactor involved and the acid or basic groups of the enzyme involved