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  • The catalytic activity of an enzyme is restricted to its small portion calledOption: 1 Allosteric siteO

The catalytic activity of an enzyme is restricted to its small portion called

Option: 1

Allosteric site


Option: 2

Active site


Option: 3

Substrate site


Option: 4

None of these


Answers (1)

best_answer

 

 

 

Active Sites:

  • Enzymes bind the specific substrates on regions called active sites to form enzyme-substrate complexes.
  • By binding substrates, enzymes stabilize the energy of the transition state, which in turn stimulates the breakage of old bonds and formation of new bonds.
  • At a constant concentration of enzyme, the enzyme activity will continue to rise up until a certain maximal value. 
  • This maximal value represents the condition in which all the active sites are filled with the appropriate substrate.
  • The active site is a specific region on enzymes that binds to the substrate.
  • The active site is a three-dimensional crack in the enzyme that contains the catalytic groups which catalyse the actual reaction.
  • As enzymes are proteins, the active sites have a combination of unique amino acid residue.
  • Each residue has a different property.
  • These properties provide specific environment suited to bind to a very specific chemical substrate.
  • Active sites stabilize the transition state.
  • Active sites make up only a small component of the overall enzyme. The remaining portion of the enzymes acts to create and support the active site by bringing residues together.

 

 

 

 

 

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An active site of an enzyme is a crevice or pocket into which the substrate fits. Thus, enzymes, through their active site, catalyse reactions at a high rate.

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shivangi.shekhar

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