Classify proteins on the basis of functional properties.
The proteins are differentiated with regard to the functions they perform.
Defense proteins—Involved in defense mechanisms for e.g. Immuno-globulins.
Respiratory proteins—Involved in the function of respiratory for e.g. Haemoglobin,
Myoglobulin, Cytochromes.
Contractile proteins—Involved in muscle contractions, and relaxation. e.g. protein of skeletal
muscles.
Hormones—Proteins acting as hormones.
Enzymes—Proteins acting as enzymes.
Structural proteins—Involved in structural integrity of cells e.g.proteins of skin, cartilage, nail.
Q. Classify proteins on the basis of solubility and its physical properties.
This is the most acceptable scheme of classification of proteins. According to this scheme
proteins are classified on the basis of their solubility and physical properties and are divided in three
different classes.
1. Simple proteins—These are the proteins, which on complete hydrolysis yield only amino
acids.
2. Conjugated proteins—These are which in addition to amino acid contain a non-protein group
called prosthetic group in their structure.
3. Derived proteins—These are the proteins formed from native protein by the action of heat,
physical forces or chemical factors.
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