Proteins – Definition, Classification, Properties and Functions

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Proteins – Definition, Classification, Properties and Functions

Definition of Protein:

Polymeric compounds the monomeric units of which is amino acid.

Classification of Protein (with examples):

A) Based on composition    B) Based on structure

A) Based on Composition:

i) Simple Proteins
ii) Conjugated Proteins
iii) Derived proteins

i) Simple Proteins: Classified according to solubility

a) Albumins
b) Globulins
c) Glutelins
d) Histories
e) Protamine
f) prolamines
g) Scleroproteins

ii) Conjugated Proteins: Contain amino acid + prosthetic group.

a) Glycoproteins
b) Chromoproteins
c) Lipoproteins
d) Nucleoproteins
e) Phosphoprotein

iii) Derived Proteins: Derivatives of proteins due to action of heat,   enzymes, or chemical reagents.

a) Primary Derived
b) Secondary Derived

B) Based on Structure:

i) Fibrous
ii) Globular

Function of Protein:

1) Storage
2) Transport
3) Structural Material
4) Metabolic Growth Regulator
5) Control of Physiological Functions
6) Catalytic Activity
7) Hormonal
8) Toxicity by Foreign Proteins

Properties of Proteins:

i) Optical Property
ii) Colloidal
iii) Solubility
iv) Amphoteric Nature
v) Denaturation of Proteins etc

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