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How are proteins classified ? |
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Answer» Solution :Proteins are classified into the following three types: (a) Simple proteins : The proteins which on hydrolysisgive only `ALPHA`-AMINO acids are called simple proteins , e.g. albumin , globulin. Simple proteins are further classified as follows: (i) Globular proteins : These proteins are spherical in shape and are soluble in water, e.g. albumin, CAESIN of milk. (ii) Fibrous proteins : These proteins have fibre-like structure and are insoluble in water , e.g. fibroin, keratin of hair, feathers, horns . (b) Conjugated proteins : The proteins which on hydrolysis give `alpha`-amino acids and some non-protein compound , are called conjugated proteins. The non-protein group present in these proteins is called prosthetic group. The prosthetic group MAY be a carbohydrate , a fat, a nucleic acid or phosphoric acid. (c) Derived proteins : The proteins which are FORMED by the treatment of some chemicals or heat on natural proteins are called derived proteins. Polypeptides orpeptones are derived proteins . |
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