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- 3. (a) Wakil's pioneering studies on fatty acid synthesis included the crucial observation that bicarbonate is required for the synthesis of palmitoyl-CoA. He was surprised to find that very low levels of bicarbonate could sustain palmitate synthesis; that is, there was no correlation between the amount of bicarbonate required and the amount of palmitate produced. Later he also observed that 14C-labeled bicarbonate is not incorporated into palmitate. Explain these observation (b) The condensation reaction catalyzed by B-ketoacyl-ACP synthase generates a 4-carbon unit by combining a 2-carbon unit with a 3-carbon unit and loss of CO2. Write with structural formulas how this occurs. What is the thermodynamic advantage of this way of generating the 4-carbon unit over combining two 2-carbon units as occurs fatty acid oxidation or ketone body reactions" (c) Decide where labeled carbon atoms will be found in palmitate if (i) (3-1“C)malonyl-SCOA or (ii) (2- 14C)malonyl-SCOA are used.Compare and contrast the pathway by which fatty acids are degraded (B-oxidation) with the pathway by which fatty acids are synthesized from acetyl-CoA. Comment on the following: (i) nature of the "activated" structures (ii) coenzymes involved (iii) stereochemistry of the intermediates (iv) sites where pathways occurGiven the following statements, identify which are true and which are not. (1) Two ribose subunits are present in the coenzyme flavin adenine dinucleotide. (2) In the common metabolic pathway, 10 molecules of ATP are produced per acetyl CoA catabolized. (3) The purpose of step 2 in the CAC is to convert a secondary alcohol to a tertiary alcohol.
- Consider the fatty acids: (a) Arachidic acid (C20H40O2); molar mass = 312.5 g/mol) (b) Palmitoleic acid(C16H30O2); molar mass = 256.4 g/mol). i. How many cycles of β -oxidation are needed for complete oxidation?ii. How many molecules of acetyl CoA are formed from its complete catabolism?iii. Calculate the number of molecules (moles) of ATP formed (net) by the completecatabolism of each fatty acid (show your calculation).iv. Calculate number of moles of ATP formed per gram of each fatty acid metabolized.1. What are the numbers of carbon atoms derived from the first acetyl-CoA that binds to fatty acid synthase complex in palmitate, the end product of the pathway? For the answer: a) name the initial substrates for fatty acid synthesis and their source; b) draw the reactions of the first spiral of fatty acid synthesis; b) mark the carbon atoms (*) derived from the first acetyl-CoA in the product of the first spiral of fatty acid synthesis; c) answer the question of the problem.Consider docosanoic acid C12H43CO2H a. Label the alpha and beta Carbons. Show the beta-oxidation in an EXPANDED structure. b. Draw each acyl CoA derived from this fatty acid. c. How many acetyl Co A molecules are formed by complete beta-oxidation? d. How many cycles of beta-oxidation are needed for complete oxidation? e. How many molecules of ATP are formed from the complete catabolism of this fatty acid? Show the complete computation. f. How many moles of ATP per gram of fatty acid is formed from the complete catabolism of the given fatty acid? g. What is the molar mass of the given fatty acid? Solution: Show here the complete computations, [from a to e]
- Looking at the structure of alpha linolenic acid, how many rounds of beta oxidation will occur to fully oxidize the fatty acid into acetyl CoA molecules? Please provide explanationsFatty acids are converted to their coenzyme A esters in a reversible reaction catalyzed by acyl-CoA synthetase: R-COO +ATP +COA R-C-COA +AMP + PPi a) The reaction involves two steps the first of which forms an enzyme-bound intermediate identified as the mixed anhydride of the fatty acid and AMP: R-C-O-P-O-nibose-adenine Write two chemical equations coresponding to the two steps of the reaction catalyzed by the synthetase. b) The acyl-CoA synthetase reaction as written above is readily reversible. How might the reaction be made to favor formation of fatty acyl-CoA? Write within the box. Anything outside the box will not be graded. From thePart A Identify each of the following metabolic pathways. Drag the appropriate labels to their respective targets. Reset Help the conversion of fatty acids to 2-carbon units of acetyl CoA ketogenesis the conversion of an amino acid to an a-keto transamination acid the combination of 2-carbon units of acetyl COA to form fatty acids oxidative deamination the removal of an amino group as NH4+ from B oxidation glutamate to yield a-ketoglutarate lipogenesis the production of ketone bodies
- 1) Humans do not undergo net synthesis of carbohydrate from acetyl- CoA, yet carbons of acetyl -CoA can be incorporated into glucose and amino acids. Show pathways as to how this can happen. 2) A molecule -X inhibits oxidation of stearoyl-CoA by isolated mitochondria but has no effect on palmitoyl-carnitine oxidation, explain.Stearic acid is the common name for the C18 straight-chain, saturated fatty acid. Draw the structure of the fatty acyl-CoA that this forms (you don't have to draw out all of the atoms in coenzyme A; you can represent it as S-CoA), and then show all of the reactions (draw all of the compounds formed) when the eighteen carbon fat is converted to two molecules of acetyl-CoA and the fourteen-carbon fat via two turns of the fatty acid spiral. List the enzymes and coenzymes that are part of the pathway.In the presence of an excess of [14C]acetyl- COA, the metabolic pool of malonyl-CoA becomes labeled at which carbon atom(s)?