Problem 10 - Campbell Biology

Question

Oseltamivir (Tamiflu), an antiviral drug prescribed for the flu, inhibits the enzyme neuraminidase. Explain how this drug could prevent infection in someone exposed to the flu or could shorten the course of flu in an infected patient (the reasons for which it is prescribed).

Step-by-Step Solution

Answer

Oseltamivir blocks neuraminidase, stopping the virus from spreading to new cells and thus preventing infection or shortening illness duration.

Step 1: Identify the role of neuraminidase

Neuraminidase is an enzyme found on the surface of the influenza virus. It allows the virus to be released from the host cell after it has replicated, which helps the infection spread to other cells.

Step 2: Understand the action of Oseltamivir

Oseltamivir (Tamiflu) is a neuraminidase inhibitor, which means it blocks the activity of the neuraminidase enzyme. By inhibiting neuraminidase, the drug prevents the release of new viral particles from infected cells.

Step 3: Explain prevention of infection

In someone exposed to the flu, Oseltamivir can prevent the spread of the virus to new cells, which may stop the infection from taking hold or becoming severe.

Step 4: Explain shortening the course of infection

In an already infected patient, by preventing the release of new viruses, Oseltamivir limits the spread and replication of the virus, which can result in a shorter duration of symptoms and illness.

Key Concepts

neuraminidase

Neuraminidase is a critical enzyme found on the surface of the influenza virus. Its main role is to help the virus spread from one cell to another by cutting through the bonds that hold new virus particles to the infected cell's surface. This allows the virus to move freely and infect new cells, making the infection worse.

When the influenza virus replicates inside a host cell, new virus particles are created. These new particles remain attached to the host cell's surface. Neuraminidase breaks these bonds, freeing the virus to infect neighboring cells.

Without neuraminidase, the virus would be stuck on the initial infected cell, unable to spread the infection further. This is why inhibiting neuraminidase is a key strategy in fighting the flu.

antiviral drug

An antiviral drug is a medication used to treat viral infections by either preventing the virus from replicating or by reducing the severity of the infection.

Oseltamivir, also known as Tamiflu, is an example of an antiviral drug. Unlike antibiotics that fight bacterial infections, antiviral drugs like Oseltamivir specifically target viruses.

Oseltamivir works by inhibiting neuraminidase. By blocking this enzyme, Oseltamivir stops the influenza virus from spreading to other cells. This can prevent the onset of the illness if taken early, or it can shorten the duration and severity of the illness in already infected patients.

Antiviral drugs are essential in managing viral outbreaks and helping patients recover more quickly.

influenza virus

The influenza virus, commonly known as the flu, is a highly contagious virus that attacks the respiratory system. Symptoms include fever, cough, sore throat, muscle aches, and fatigue.

The virus spreads through droplets when an infected person sneezes, coughs, or talks. These droplets can be inhaled or can land on surfaces where they can be picked up by touch and transferred to the nose or mouth.

There are different types of influenza viruses, including Influenza A and B, which are the most common. Each year, the strains of the virus can change, which is why the flu vaccine is updated annually to provide protection against the most prevalent strains.

Influenza can lead to serious complications in certain groups, such as the elderly, young children, and those with certain health conditions. Preventing and treating the flu effectively is important to avoid these complications.