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 [...]
In this article we will discuss about the primary structure of peptides and proteins. Peptides and proteins consist of chains of amino acids linked by peptide bonds. We observe a structure analogy with the biuret molecule, formed by the condensation of 2 urea molecules (as indicated by its name) with elimination of one molecule of NH3(H2N—CO — NH-CO —NH2) and [...]