Classification of proteins

1. Classification on the basis of composition and solubility of proteins

1.1. Simple proteins

1.1.1. Fibrous proteins.. ex:Keratins,Collagens

1.1.2. Globular proteins.. ex:Albumins,Globulins,Histones..

1.2. Conjugated proteins.. ex:glycoprotein, phosphoprotein,lipoprotein

1.3. Derived proteins.. *Do not exit in nature..

2. Classification on the basis of function of proteins

2.1. Structure

2.2. Catalysis

2.3. Movement

2.4. Transport

2.5. Protection

2.6. Storage

2.7. Regulation

2.8. Hormonal proteins

2.9. Nucleoproteins

3. Classification on the basis of shape and size of proteins

3.1. Fibrous proteins..

3.2. Globular proteins

4. Classification on the basis of nutritive value of proteins

4.1. Partially complete proteins:Contain all the ten essential amino acids but such proteins are quantitatively deficient in one or more essential amino acids required for normal synthesis of tissue proteins..ex:cereals

4.2. Incomplete proteins:one or more essential amino acids are found completely absent in complete proteins..ex:gelatin

4.3. Complete proteins:contain all the ten essential amino acids in right quantity and proportion required for synthesis of tissue proteins in human body..ex:egg