The rate of product formation in an enzyme-catalyzed reaction is determined by the breakdown of the enzyme-substrate complex. Discuss factors that may reduce the rate of product formation and explain how allosteric regulation plays an important role in the regulation of many metabolic pathways. You have been asked to design an antiviral drug to prevent the replication of the SARS-CoV-2 coronavirus that causes COVID-19. How will you use your knowledge of enzyme inhibitors to select a viral protein as the potential target for your drug to work against?
Added by Michelle W.
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Factors that may reduce the rate of product formation in an enzyme-catalyzed reaction: a. Substrate concentration: A lower substrate concentration will result in fewer enzyme-substrate complexes, thus reducing the rate of product formation. b. Enzyme Show more…
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For most reactions that involve an enzyme, the rate of product formation versus reactant concentration increases as reactant concentration increases until a maximum value is obtained, after which further increases do not yield increased rates. Using a description like that in Figure 16-19, describe how the reaction may be first order with respect to substrate but the amount of enzyme can also be a determining factor.
Classify the enzyme inhibitors by giving the names, mechanisms, and effects on the kinetic parameters Km and Vmax. Draw and annotate a double reciprocal plot for each type of inhibition. 2. For an enzyme reaction followed spectrophotometrically at 340 nm, the Vmax was calculated at 0.14 ΔA340/min (ε340 = 5.22 mM-1.cm-1). The 1 mL reaction in a 1 cm cuvette contained 30 ng of an enzyme (Mr of 100,000 g/mole). Calculate the Kcat for this enzyme. 3. An example of an enzyme-catalyzed reaction proceeding via a transition-state stabilization mechanism is the hydrolysis of peptides by chymotrypsin, while lysozyme is often cited as an example of an enzyme which operates by a strain mechanism. Discuss both mechanisms in the context of each enzyme.
Adi S.
LEARNING OBJECTIVES By the end of this chapter, you should be able to: 1. Discuss four general strategies used by enzymes to accelerate particular reactions. 2. Give examples of specific chemical features of enzyme active sites that facilitate increasing the rates of specific reactions. 3. Give an example of when high absolute rate acceleration is physiologically important and how an enzyme achieves this acceleration. 4. Understand when high specificity is important for an enzyme and how this specificity is achieved. 5. Describe an example of when large conformational changes that occur during an enzymatic reaction cycle are used to drive other processes. 6. Discuss some of the experimental approaches that are used to elucidate enzymatic mechanisms.
Madhur L.
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