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Allosteric Modulation

Which one of ...

Question

Which one of the following characteristics best applies to an allosteric effector?

A

Competes with the substrate for the catalytic site

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B

Binds to a site on the enzyme molecule distinct from the catalytic site

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C

Changes the nature of the product formed

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D

Changes substrate specificity of the enzyme

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Solution

The correct option is B
Binds to a site on the enzyme molecule distinct from the catalytic site

Allosteric regulation (or allosteric control) is the regulation of a protein by the binding of an effector molecule at a site other than the protein's active site. The site to which the effector binds is termed the allosteric site. After binding, the active site is changed in such a way that the activity of the enzyme is either increased or decreased.

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Similar questions

Q. Assertion :Competitive inhibitors compete with the natural substrate for their attachment on the active sites of enzymes. Reason: In competitive inhibition, inhibitor binds to allosteric site of the enzyme.

Q. The catalytic cycle of an enzyme action can be described by the steps given below:

(A) The active site of enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate and the new enzyme-product complex is formed.
(B) The binding of the substrate induces the enzymes to alter its shape, fitting more tighty around the substrate.
(C) The substrate binds to the active site of the enzyme, fitting into the active site.
(D) The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate and run through the catalytic cycle once again.

Arrange them in the correct sequence.

Q. Identify the wrong statemets.

(a)

The substrate binds to active site of enzyme and not fitting into active site

(b)

The binding of substrate induces the enzyme to alter its shape

(c)

Chemical bonds of substrate break down not to form new enzyme-product complex

(d)

The enzyme releases the products of the reaction and runs through catalytic cycle once again

Q. Assertion : Enzymes have active sites that hold substrate molecule for a chemical reaction
Reason : Drugs compete with natural substrate by attaching covalently to the active site of enzyme

Q. Arrange the steps of catalytic action of an enzyme in order and choose the right option.

(i)

Enzyme releases products of reaction and the enzyme is free to bind to another substrate.

(i i)

Active site of enzyme is in close proximity of substrate and breaks the chemical bonds of substrate.

(i i i)

Binding of substrate induces enzyme to alter its shape fitting more tightly around substrate.

(i v)

Substrate binds to active site of enzyme fitting into active site.

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