Is Enzyme A Protein: 7 Facts You Should Know

Proteins that contain amino acids linked together in one or more polypeptide chains are called enzymes. Let us discuss if enzyme is a protein or not.

Enzymes are proteins as they function as biological catalysts that enable reactions in a living cell without enduring too much change. Proteins are best equipped to serve as enzymes among other roles because of their capacity for reversible shape alterations.

Proteins, also known as enzymes aid in accelerating our bodies’ chemical reactions, or metabolism. Let us learn different facts about enzymes.

Are all enzymes a protein?

In addition to catalyzing process, proteins play numerous other functions in cells and organisms. Let us see whether all enzymes are protein or not.

All enzymes are proteins, but not all proteins are enzymes because only a small number of proteins have the ability to bind the substrate with the aid of their active sites in a way that promotes an effective reaction.

Which enzymes are protein?

Proteins called enzymes are made up of amino acids connected by one or more polypeptide chains. Let us see which all enzymes act as a protein.

Those enzymes which have the fundamental structure of a polypeptide chain with arrangement of amino acids act as a protein. This in turn dictates the enzyme’s three-dimensional structure, including the active site’s shape.

Image Credits: Enzyme by Thomas Shafee (CC BY 4.0)

How enzymes are protein?

The biochemical reactions that take place in cells are catalysed by enzymes, another type of protein. Let us see how enzymes act as protein.

Enzyme are proteins in such a way that the proteins serve as a monitor, altering their structure and function in response to cellular signals. The objective of an enzyme’s active sites is to carry out a specific chemical reaction on its substrate quickly enough to serve biological needs.

Why enzymes are protein?

Enzymes are biological catalysts that allow reactions to occur in a living cell without causing it to alter significantly. Let us learn more about this.

Enzymes are protein because of their capacity to undergo shape changes which is reversible. Sugars and lipids, for example, are less suitable for this purpose than other biological macromolecules.

Example of enzymes as a protein

Depending on the function they carry out in the body, experts classify enzymes into a number of different categories.

  • Trypsin: In the small intestine, these enzymes disassemble proteins into their component amino acids.
  • Amylase: Amylase, found in saliva, aids in the conversion of carbohydrates to sugars.
  • Maltase: Maltase, which also exists in saliva, converts the sugar maltose into glucose
  • Lipases : Lipases are a class of digestive enzymes that aid in the breakdown of lipids in the gastrointestinal tract
  • Trypsin: In the small intestine, trypsin enzymes disassemble proteins into their component amino acids
  • Lactase: Lactase converts the milk sugar lactose into glucose and galactose. These enzymes degrade the neurotransmitter acetylcholine in nerves and muscles, and their name is acetylcholinesterase.
  • DNA polymerase: Deoxyribonucleotides are converted into DNA by the DNA polymerase enzyme.

Some others are transferases, hydrolases, lyases, ligases, isomerases. Among the several kinds are oxidoreductases are a reliable source.

Which enzymes are not proteins?

Non-enzyme proteins can have active sites that carry out a very broad range of tasks. Let us see in detail which enzymes are not proteins.

The majority of enzymes that participate in signal transduction are not proteins. Ribozymes, RNA-based enzyme, is the enzyme that lacks a protein component. RNA with catalytic activity makes up ribozymes. Antibodies that function as protective proteins are not enzymes, for instance.

Is lactase enzyme a protein?

A member of the -galactosidase enzyme family, lactase is also known as lactase-phlorizin hydrolase, or LPH. Let us learn if lactase enzyme is a protein or not.

Lactase enzyme is a protein. It is a glycoside hydrolase that aids in the breakdown of the disaccharide lactose into its component monomers of galactose and glucose. Lactase converts lactose into the two simple sugars that make it up—galactose and glucose.


From the above article, it can be concluded that enzymes only serve as functional proteins, whereas proteins can be either structurally or functionally involved in biochemical reactions in living organisms.

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