Which is an example of feedback inhibition answers?

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Which of the following is an example of feedback inhibition?(A) Cyanide action on cytochrome(B) Sulphur drug on folic acid synthesizer bacteria(C) Inhibition of hexokinase by ${\text{glucose}} - 6 - {\text{phosphate}}$(D) Reaction between succinic dehydrogenase and succinate

Answer

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Hint: Feedback inhibition is the process in which the activity of the enzymes get retarded by the end product produced by the same enzymes. Hence the enzyme working stops after the desired output is obtained. In the complex biochemical processes, there involved the more enzymes to obtain the end product

Complete answer:
Feedback inhibition is the process that occurs at the end of the metabolic process in the cell and it inhibits the catalyzing of an enzyme. The finished result is the inhibitor and the compound inactivated is called allosteric chemical. The catalyst is controlled by modulators that quandary noncovalently at site other than the dynamic site.

An example of the feedback inhibition is the hindrance of the action of the protein hexokinase by glucose 6-phosphate in glycolysis. This protein catalyzes the change of glucose into glucose 6-phosphate however as the response continues, the addition in grouping of ${\text{glucose}} - 6 - {\text{phosphate}}$ restrains the action of hexokinase. Hence the example of the feedback inhibition is the inhibition of the hexokinase by the ${\text{glucose}} - 6 - {\text{phosphate}}$

Hence the correct answer is OPTION(C)

Note: The other examples of the feedback inhibition is production of the ATP molecules, production of the amino acids and the cholesterol needed for the metabolism. Hence the feedback inhibitor helps in the maintenance of the homeostasis of the body.

Understanding:

•  Metabolic pathways can be controlled by end-product inhibition

    
End-product inhibition (or feedback inhibition) is a form of negative feedback by which metabolic pathways can be controlled

• In end-product inhibition, the final product in a series of reactions inhibits an enzyme from an earlier step in the sequence
• The product binds to an allosteric site and temporarily inactivates the enzyme (via non-competitive inhibition)
• As the enzyme can no longer function, the reaction sequence is halted and the rate of product formation is decreased

End-product inhibition functions to ensure levels of an essential product are always tightly regulated

• If product levels build up, the product inhibits the reaction pathway and hence decreases the rate of further product formation
• If product levels drop, the reaction pathway will proceed unhindered and the rate of product formation will increase

End-Product Inhibition

Application:

•  End-product inhibition of the pathway that converts threonine to isoleucine

    
Isoleucine is an essential amino acid, meaning it is not synthesised by the body in humans (and hence must be ingested)

• Food sources rich in isoleucine include eggs, seaweed, fish, cheese, chicken and lamb

In plants and bacteria, isoleucine may be synthesised from threonine in a five-step reaction pathway

• In the first step of this process, threonine is converted into an intermediate compound by an enzyme (threonine deaminase)
• Isoleucine can bind to an allosteric site on this enzyme and function as a non-competitive inhibitor

As excess production of isoleucine inhibits further synthesis, it functions as an example of end-product inhibition

• This feedback inhibition ensures that isoleucine production does not cannibalise available stocks of threonine

Threonine → Isoleucine Pathway

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