Proteins are classified in various ways: 1. Simple Proteins 2. Conjugated Proteins 3. Derived Proteins. 1. Simple Proteins: These are pure proteins, uncombined with anything else. The important members of this group are as follows: (a) Protamines: Found in the sperm of certain fishes; molecular wt. low, about 2000; strongly basic in character, not coagulated by heat and soluble in [...]
In this article we will discuss about the structure of IgG, explained with the help of suitable diagrams. Electron microscopic studies have revealed that IgG is a Y-shaped tetrapeptide protein (Fig. 8.20) formed of two identical light chains and two identical heavy chains. So an antibody is represented as H2L2. Light Chains: Each light chain is formed of about 214 [...]
As indicated by their name, these are coloured proteins, their prosthetic group often contains a metal element (Fe, Cu, Mg). These compounds are generally classified on the basis of their prosthetic group having, or not having, the tetrapyrrol structure called porphyrin and according to their respiratory or non-respiratory physiological role. 1. Porphyrin Chromoproteins: A. Respiratory Pigments: They all contain iron. [...]