Transition state analogues are compounds that closely resemble the structure of a substrate's transition state in an enzyme-catalyzed reaction. The study of transition state analogues is a technique used in rational drug design to develop new pharmaceuticals. Oseltamivir is a well-known drug discovered using this technique and is effective in treating influenza. It functions as a competitive inhibitor for the enzyme neuraminidase, preventing neuraminidase from acting on its target substrate, sialic acid. Neuraminidase is typically found on the protein coat of the influenza virus and helps release newly formed viral particles from the host cell, allowing them to infect other cells. By tightly binding to the active site of neuraminidase, Oseltamivir inhibits this process and reduces the infectivity of the influenza virus. Since Oseltamivir is a transition state analogue of sialic acid, its chemical structure closely resembles that of sialic acid.
MULTIPLE CHOICE QUESTION
Try yourself: Which technique is used in rational drug design to develop new pharmaceuticals?
A
Transition state analogues
B
Enzyme inhibition
C
Substrate modification
D
Protein synthesis
Correct Answer: A
The passage states that the study of transition state analogues is a technique used in rational drug design to develop new pharmaceuticals. This makes option a) the correct answer.
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MULTIPLE CHOICE QUESTION
Try yourself: What is the role of Oseltamivir in treating influenza?
A
It stimulates the immune system.
B
It inhibits the replication of the influenza virus.
C
It reduces the symptoms of influenza.
D
It enhances the production of neuraminidase.
Correct Answer: B
The passage mentions that Oseltamivir is a competitive inhibitor for neuraminidase, which prevents the virus from infecting other cells. Therefore, option b) accurately describes the role of Oseltamivir.
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MULTIPLE CHOICE QUESTION
Try yourself: Which enzyme is targeted by Oseltamivir?
A
Neuraminidase
B
Protease
C
Polymerase
D
Kinase
Correct Answer: A
The passage clearly states that Oseltamivir is a competitive inhibitor for the enzyme neuraminidase. Hence, option a) is the correct answer.
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MULTIPLE CHOICE QUESTION
Try yourself: How does Oseltamivir reduce the infectivity of the influenza virus?
A
It destroys the virus particles.
B
It blocks the entry of the virus into host cells.
C
It prevents the release of new viral particles from host cells.
D
It enhances the immune response against the virus.
Correct Answer: C
The passage explains that Oseltamivir, by tightly binding to neuraminidase, inhibits the release of newly formed viral particles from the host cell, reducing the infectivity of the influenza virus. This aligns with option c).
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MULTIPLE CHOICE QUESTION
Try yourself: Why are the chemical structures of Oseltamivir and sialic acid similar?
A
They have a common precursor.
B
They are both transition state analogues.
C
They share a common functional group.
D
They are both competitive inhibitors.
Correct Answer: B
The passage states that Oseltamivir is a transition state analogue of sialic acid, indicating that their chemical structures closely resemble each other. Thus, option b) is the correct answer.
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