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Mechanism of Enzyme Action

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Question

According to the induced fit hypothesis, which of the active site of enzymes brings about the catalytic changes of the substrate?

A

Buttressing group

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B

Catalytic group

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C

Allosteric group

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D

Either buttressing or catalytic group

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Solution

The correct option is B Catalytic group
According to induced fit hypothesis, the active site of enzyme contains two groups :-
(a) Buttressing group : It provides support for the attachment of the substrate to the enzyme.
(b) Catalytic group : It helps in catalysing the reaction by the conversion of the substrate to the product.

Allosteric group of the enzyme is the part other than the active site that brings about conformational change to the active site of the enzymes.

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Similar questions

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.

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. 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 statements:

(A) The substrate binds to the active site of the enzyme and not fitting into the active site.
(B) The binding of the substrate induces the enzyme to alter its shape.
(C) Chemical bonds of the substrate does not break down to form new enzyme-product complex.
(D) The enzyme releases the reaction and runs through the catalytic cycle once again.

Q. Is allosteric inhibition only applicable in the lock and key mechanism?
Since the induced fit theory tells that the substrate can actually induce a change in the active site of the enzyme, hence even if the inibitor attaches itself to the enzyme, the substrate can attach to it (by changing the shape of the active site).

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