Ask Question, Ask an Expert

+61-413 786 465

info@mywordsolution.com

Ask Biology Expert

Problem:

Topoisomerase II poisons represent some of the most important and widely prescribed anticancer drugs currently in clinical use. These drugs encompass a diverse group of natural and synthetic compounds that are commonly used to treat a variety of human malignancies. At the present time, six topoisomerase II-targeted anticancer agents are approved for use in the United States, and additional drugs are prescribed elsewhere in the world. These agents all act as traditional topoisomerase II poisons and function primarily by inhibiting enzyme-mediated DNA ligation.

Question: Briefly describe what TopoII does and how it works.

Question: Explain what "inhibiting enzyme-mediated DNA ligation" means. Please describe in detail.

 

My thoughts for the first question are Type II topoisomerases cut both strands of the DNA helix simultaneously in order to manage DNA tangles and supercoils. They use the hydrolysis of ATP. It changes the linking number of circular DNA by ±2. After the ends are cut, the ends of the DNA are separated and a second DNA duplex is passed through the break. The cut DNA is re- ligated. This allows the enzyme to increase or decrease the linking number of a DNA loop by 2 units. It also promotes chromosome disentanglement. Inhibiting enzyme-mediated DNA ligation means that it prevents the enzymes are not allowed to ligate. This is prevented by not allowing the formation of a phosphodiester bond.

Cancer cells grow much more rapidly than most cells in the body. What would be the consequence of "inhibiting enzyme-mediated DNA ligation" and why might this be particularly deleterious in cancer cells?
I am really unsure on this one.
I have looked at the Wikipedia answers to this question and they are wrong.

Biology, Academics

  • Category:- Biology
  • Reference No.:- M91148610

Have any Question?


Related Questions in Biology

The current scientific defination of standard temp and

The current scientific defination of standard temp and pressure (STP) is: 0 degrees C and 1.00 bar pressure of a gas, using ideal gas law calculate the volume In L occupied by 1 mol of an ideal gas under these condition( ...

Is it possible to increase the temperature of a gas in a

Is it possible to increase the temperature of a gas in a cylinder without any energy addition as heat? Explain your answer using the first law of thermodynamics.

A cross between a person with straight hair and a person

A cross between a person with straight hair and a person with curly hair will produce a child with wavy hair. If 2 people with wavy hair had a child, what are the odds that the child would have straight hair?

1 is a vitamin that sunlight on the skin typically

1. __________ is a vitamin that sunlight on the skin typically triggers within the body. 2. The specific cell type that produces bone tissue is called _____________. 3. The four components of a negative feedback loop ___ ...

You take a small section of leaf and view it underneath a

You take a small section of leaf and view it underneath a microscope. You count 25 stomata. Now you want to calculate how many stomata would be in a leaf the size of a penny. a) Calculate the area of the view of view (A= ...

How does enzymes lower activation energy when they catalyze

How does enzymes lower activation energy when they catalyze reactions?

Question darwin was not the first to consider evolution as

Question: Darwin was not the first to consider evolution as a process but he did come up with the first effective explanation for how it happens. Describe Darwin's theory of evolution by natural selection. Explain how th ...

Why biologically is evolved resistance to crop pests

Why, biologically, is evolved resistance to crop pests inevitable?

Diffusion and osmosis questionin your large intestine the

Diffusion and osmosis question In your large intestine, the water from the food you have eaten needs to be kept in the body to prevent dehydration. Therefore the high concentration of water in feces needs to be moved int ...

Chosen dr jan nolta- stem cell researcher head of uc davis

Chosen Dr. Jan Nolta- Stem Cell Researcher Head of UC Davis Stem Cell Program Director Topic Background: early Stem cells have the ability to develop into many different types of cells. Stem Cell Research is not without ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As