CAMPBELL BIOLOGY-MASTERING BIO.ACCESS
12th Edition
ISBN: 9780136486787
Author: Urry
Publisher: SAVVAS L
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Chapter 8.5, Problem 2CC
Summary Introduction
To determine: Involvement of ATP in the feedback inhibition of a catabolic pathway.
Introduction: Feedback inhibition is a mechanism in multistep pathways that aids in ceasing the reaction when one of the substrates is over produced. The substrate that is being over produced bind to one of the enzymes of the reaction. This will in turn stop the whole cycle of reactions because each step is interdependent.
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(a) Identify the group in pyridoxal phosphate (PLP) that covalently binds enzyme and substrate.
Hint
A
B
_H
OH
Previous
CH3
(b) Aminotransferases (transaminases) must deaminate one amino acid and add an amino group to another
amino acid during transamination. How do the two processes differ?
Map
The second part of the reaction (adding an amino group) is the reverse of the first (deamination).
The second part of the reaction takes place at a separate amino acid residue in the active site.
The first reaction involves the formation of a Schiff base, whereas the second does not.
The coenzyme PLP must be activated by an external amino group before it can catalyze the
removal of the amino group from the first amino acid.
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Chapter 8 Solutions
CAMPBELL BIOLOGY-MASTERING BIO.ACCESS
Ch. 8.1 - Prob. 1CCCh. 8.1 - Describe the forms of energy found in an apple as...Ch. 8.1 - WHAT IF? If you place a teaspoon of sugar in the...Ch. 8.2 - Cellular respiration uses glucose and oxygen,...Ch. 8.2 - VISUAL SKILLS How would the processes of...Ch. 8.2 - Prob. 3CCCh. 8.3 - How does ATP typically transfer energy from an...Ch. 8.3 - Prob. 2CCCh. 8.3 - MAKE CONNECTIONS Does Figure 8.11a show passive...Ch. 8.4 - Many spontaneous reactions occur very slowly. Why...
Ch. 8.4 - Prob. 2CCCh. 8.4 - WHAT IF? Malonate is an inhibitor of the enzyme...Ch. 8.4 - Prob. 4CCCh. 8.5 - How do an activator and an inhibitor have...Ch. 8.5 - Prob. 2CCCh. 8 - Explain how the highly ordered structure of a cell...Ch. 8 - Explain the meaning of each component in the...Ch. 8 - Describe the ATP cycle: How is ATP used and...Ch. 8 - How do both activation energy barriers and enzymes...Ch. 8 - Prob. 8.5CRCh. 8 - Choose the pair of terms that correctly completes...Ch. 8 - Prob. 2TYUCh. 8 - Which of the following metabolic processes can...Ch. 8 - Prob. 4TYUCh. 8 - Some bacteria art metabolically active in hot...Ch. 8 - If an enzyme is added to a solution where its...Ch. 8 - Prob. 7TYUCh. 8 - EVOLUTION CONNECTION Some people argue that...Ch. 8 - Prob. 9TYUCh. 8 - WRITE ABOUT A THEME: ENERGY AND MATTER Life...Ch. 8 - Prob. 11TYU
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- A3arrow_forwardHiarrow_forwardRecall that phosphonacetyl L - aspartate (PALA) is a potent inhibitor of ATCase because it mimics the two physiological substrates. However, in the presence of substrates, low concentrations of this unreactive bisubstrate analog increase the reaction velocity. On the addition of PALA, the reaction rate increases until an average of three molecules of PALA are bound per molecule of enzyme. This maximal velocity is 17-fold greater than it is in the absence of PALA. The reaction rate then decreases to nearly zero on the addition of three more molecules of PALA per molecule of enzyme. Why do low concentrations of PALA activate ATCase?arrow_forward
- Mcqarrow_forward. Propose a chemical mechanism for the reaction catalyzed by the PLP-dependent glatamate 1-semialdehyde aminomutase.arrow_forward. Consider the enzymatic reaction scheme: Asparagine + H20 Aspartate + NH3: a) calculate the specific activity of the enzyme, if in 30 seconds as a result of a reaction involving 3 mg of the enzyme under optimal conditions (pH 8.0, 37 °C) 75 umol aspartate is obtained; b) describe the reasons for the decrease in enzyme activity after incubation for 6. 10 minutes at 70 °C (provide an appropriate graph).arrow_forward
- Help me, pleasearrow_forwardQno5 solve asap . Draw goodarrow_forwardPuting a metabolic pathway map together which includes glycolysis, gluconeogenesis, glycogen synthesis & glycogenolysis, and the two types of fermentation, and pyruvate oxidation (to acetyl-CoA). The map should have/illustrate/show all of the indicated 6 pathways stated previously on the same page, to emphasize how these processes are related to each other. map should include: a) Clear labels for all the pathways b) All the pathways shown on the same page and correctly integrated with each other, i.e., it should be clear which reactions are shared by different pathways c) The names of all metabolites (common abbreviations may be used) d) The names of all enzymes e) All relevant cofactors/co-substrates discussed in class, clearly showing, where ATP is used and produced f) Double or single arrows representing reversible or irreversible reactions, respectively g) All "high-energy" intermediates clearly labeled with an asterisk (*) h) Labels for cellular locations of…arrow_forward
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