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Ch.21 The Generation of Biochemical Energy
McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.21 The Generation of Biochemical EnergyProblema 6
Capitolo 21, Problema 6

One of the steps in lipid metabolism is the reaction of glycerol (1,2,3-propanetriol, HOCH2CH(OH)CH2OH, with ATP to yield glycerol 1-phosphate. Write the equation for this reaction using the curved arrow symbolism.

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Step 1: Understand the reaction. Glycerol (1,2,3-propanetriol) reacts with ATP (adenosine triphosphate) to form glycerol 1-phosphate and ADP (adenosine diphosphate). This is a phosphorylation reaction where a phosphate group is transferred from ATP to glycerol.
Step 2: Identify the nucleophile and electrophile. In this reaction, the hydroxyl group (-OH) on the first carbon of glycerol acts as the nucleophile, and the terminal phosphate group of ATP acts as the electrophile.
Step 3: Draw the curved arrow mechanism. Use a curved arrow to show the lone pair of electrons on the oxygen atom of the hydroxyl group attacking the phosphorus atom of the terminal phosphate group in ATP. This forms a new bond between the oxygen and phosphorus.
Step 4: Show the leaving group. As the bond between the oxygen and phosphorus forms, the bond between the terminal phosphate group and the rest of the ATP molecule breaks, resulting in the release of ADP as the leaving group.
Step 5: Write the balanced chemical equation. The reaction can be represented as: HOCH2(OH)CH(OH)+ATP→HOCH2(OPOCH(OH)+ADP. Ensure the curved arrows and electron flow are clearly depicted in your diagram.

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Lipid Metabolism

Lipid metabolism refers to the biochemical processes involved in the synthesis and degradation of lipids in cells. It includes the breakdown of fats for energy and the synthesis of fatty acids and glycerol. Understanding lipid metabolism is crucial for grasping how glycerol is utilized in energy production and how it interacts with other metabolic pathways.
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Summary of Lipid Metabolism Concept 1

Curved Arrow Symbolism

Curved arrow symbolism is a method used in organic chemistry to depict the movement of electrons during chemical reactions. The arrows indicate the direction of electron flow, helping to visualize the formation and breaking of bonds. This notation is essential for accurately representing the reaction of glycerol with ATP, as it illustrates how energy is transferred and chemical bonds are formed.
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Heating and Cooling Curves Concept 2

ATP (Adenosine Triphosphate)

ATP, or adenosine triphosphate, is the primary energy carrier in all living organisms. It provides the energy required for various biochemical reactions, including those in lipid metabolism. In the context of the reaction with glycerol, ATP donates a phosphate group, facilitating the conversion of glycerol to glycerol 1-phosphate, which is a key intermediate in lipid synthesis.
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Adenosine Triphosphate (ATP) Example 2
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The hydrolysis of acetyl phosphate to give acetate and hydrogen phosphate ion has ∆G = -10.3 kcal/mol (-43.1 kJ/mol). Combine the equations and ∆G values to determine whether coupling of this reaction with phosphorylation of ADP to produce ATP is favorable. (You need give only compound names or abbreviations in the equations.)

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Which of the following is found in the coenzyme FAD?

a. Two heterocyclic rings

b. ADP

c. A substituted benzene ring

d. A phosphate anhydride bond

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The overall equation in this section,

shows the cycle between photosynthesis and oxidation. Pathways operating in opposite directions cannot be exergonic in both directions.

a. Which of the two pathways in this cycle is exergonic and which is endergonic?

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Look ahead to Figure 21.8 for the citric acid cycle.

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a. Draw the structures of the reactants in steps 3, 6, and 8, and indicate which hydrogen atoms are removed in these reactions.

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Domanda del libro di testo

Acetyl phosphate, whose structure is given here, is another compound with a relatively high free energy of hydrolysis.

Using structural formulas, write the equation for the hydrolysis of this phosphate.

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Domanda del libro di testo

A common metabolic strategy is the lack of reactivity—that is, the slowness to react—of compounds whose breakdown is exergonic. For example, hydrolysis of ATP to ADP or adenosine monophosphate (AMP) is exergonic but does not take place without an appropriate enzyme present. Why would the cell use this metabolic strategy?

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