Enzymes are biological catalyst that accelerates rate of a biochemical reaction.

Enzymes and Proteins

When an enzyme is acted upon pepsin crystalline composition of enzyme disappears with decrease in its catalytic activity.

Having a complex structure like proteins which are a unique complex molecule.

Heat, acid, alkali, and other agents that denature proteins also destroy activity of enzymes.

Show color reaction and ultraviolet absorption spectrum which is a characteristic of a protein.

Enzymes, Hormones, Difference between enzyme and hormone.

Molecular Structure of Enzyme

There are two general types of structure of enzymes found. They are amphoteric and collided with nature.

Simple Protein Molecule

Containing only acids.

Conjugated Protein Enzyme

Having two parts

Apo Enzyme – acids

Cofactor Enzyme – A non-protein molecule

The enzyme molecule containing protein and cofactor is known as the holoenzyme.

Cofactor may be an inorganic metal ion or an organic prosthetic group or coenzyme.

General Properties of an Enzyme

They are active in extremely small amounts.

The enzyme remains unaffected by the reaction.

The enzyme does not affect the equilibrium of the reaction.

They are specific in nature.

They are thermolabile in nature.

Nomenclature and Classification of Enzyme

An enzyme is divided into six major class:-

Oxidoreductase enzyme

Catalyze oxidoreductase reaction, e.g. cytochrome oxidase catalyzes the oxidation of cytochrome.


Transfer the functional group other than hydrogen from one substance to another e.g, Glutamate pyruvate transaminase catalyzes the shifting of an group from glutamate to pyruvate.


Catalyze the hydrogen of a substrate by adding constituents of the water e.g. esterase


Catalyze the reaction in which substrate e.g, Histamine decarboxylase breaks the covalent bond between carbon atoms.


Catalyze the reaction in which substrate is converted into its positional or optical isomer by intermolecular rearrangement e.g. Phosphohexoisomerase catalyzes the conversion of glucose 6 phosphates into fructose.


The enzyme catalyzes the linking together pyruvate and carbon dioxide to form oxaloacetate.

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