Both the enzymes and also receptors space targets because that drug activity and plenty of biomolecules in the body.

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Further, lock both are proteinaceous in nature and aid to manage body physiology.

But, they have actually stark differences in regards to their structure, mechanism, and also functions in the body.

By definition

Enzymes are protein biomolecules that act as catalysts to boost the price of reaction in existence of substrate.


Receptors space the signal receivers and form the front end of the messenger communication system. They evoke and bringing alters in human body physiology as soon as a ligand binds to them.


In pharmacology, few enzymes act as receptors and also even a couple of receptors have enzymes withing them.

See the types of receptors because that an idea.

The similarities between enzymes and also receptors

Enzymes and also receptors are similar in the following ways like


Enzymes and receptors are quite certain in terms of the chemicals stimulating them, the reactions or effects involved, their location in the body, and the environment around them. Permit me take it the examples of enzyme nucleases and nicotinic receptor to describe them in detail for you.

♦ chemicals stimulating them

Both the receptors and also enzymes act only on stimulation through a details chemical.

The enzyme nuclease is energetic only in presence of nucleic acids prefer the DNA and RNA together substrate.

Similarly, the nicotine castle receptor is energetic only in the presence of the ligands acetylcholine, nicotine, or various other related chemicals.

They execute not get engendered by any type of other substrate or ligands other than those pointed out above.

♦ ar in the body

Enzyme nucleases are developed in the pancreas and released into the small intestine. That is not found in various other regions of the body.

Likewise, the nicotinic receptor is discovered specifically in the ganglia and also neuromuscular junction

♦ Environment

Both enzymes and the receptors need a conducive environment to function.

Enzymes call for optimal temperature and pH come function. In ~ the really high temperature they obtain denatured destroyed) and also at temperature, they are much less active.

At optimal pH castle enzyme help in the switch of substrate to product. While at unfavorable pH, they end up being inactive.

Receptors too call for optimal temperature and pH to bind v ligands efficiently. The ligand-receptor binding varies through temperature.

This is because, the drug (ligand) receptor binding occurs by one of two people electrostatic, covalent bonds, or hydrophobic bonds. This bonds differ in toughness with temperature.


Both room by themselves inert and also not energetic unless stimulated.

They can develop an result only in existence of a substrate or ligand respectively.

For example, the enzyme amylase shows its impact only in the presence of carbohydrates like starch. It does no induce a biochemical reaction unless there is a carbohydrate.

Similarly, a nicotine castle receptor is energetic only in the visibility of a ligand prefer acetylcholine which deserve to stimulate it.


Both can act together targets for medicine molecules.

For example, lisinopril is offered to regulate high blood pressure by inhibiting the enzyme angiotensin-converting enzyme.

While metoprolol is offered to manage blood press by exhilaration on β-receptors.

Reaction kinetics

Both attributes can be explained by kinetic equations like the price of association and also dissociation constants.

As long as the enzyme is bound come the substrate, there is a product formation, and also when the substrate dissociates native the enzyme no product is formed.

Similarly, as long as the ligand is bound to the receptor, over there is a response. Once ligands dissociate, over there is no further an answer from receptors.

Degree the response

The concentration of enzymes and receptors matters. A diminish in concentration than forced can give sub-maximal responses when engendered by substrate or ligand respectively.


Their actions can be controlled by rivals for binding. I.e. A substrate that binding to enzyme and also ligand which binding to the receptor deserve to be displaced by a compete binder.

Thus the action of enzymes and also receptors have the right to be manipulated.


The function of enzyme and additionally receptors have the right to be clogged by respective inhibitors. This inhibitors tie to enzyme and also receptors and also prevent the initial ligands native binding and evoking a response.

Allosteric binding sites

An allosteric binding website is a site on the enzyme or receptors which is nearby to the yes, really binding site.

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These website can assist in regulating the overall solution of the enzyme or receptor in a optimistic or an adverse way. Despite the really substrate or ligand binds, its response will be affected by the molecule bound come the allosteric site.