Download The Secrets of Proteins by MEDHA S. RAJADHYAKSHA SUKANYA DATTA PDF

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Many proteins comprise of a mixture of beta sheets and alpha helices. Structures that are globular in shape are formed out of 6 sheets and a helices held together closely. Each such region is called a 'domain'. A domain is associated with a particular function. A protein may have several domains or just one. Small proteins have one domain while large, ones have many. When more than one domain is present in a protein, there is often a small chain of amino acids that joins them. In a protein several domains may come together in three dimension by a fold in the chain, linking them to form a shape that is very important for its function.

What the DNA molecule looks like and how it works has been understood after almost a century of experimentation. Initiated into an enquiry by Gregor Mendel on 'particles' of heredity, in 1865, scientists painstakingly worked for years on the question. While bacterial and fruitfly genetics ascertained the role of DNA as the 50 THE SECRETS O F PROTEINS Pyrimidine bases Thymine^: . uracil (U)- Cytosme © Purine bases Guanine (G)_ Fig. 3: The base^ are an integral part of the DNA molecule. heredity molecule, biochemists and physicists developed novel protocols and techniques to understand the physical features of the molecule.

One of the most important classes of defence molecules, without which we would die of infections, is the immumoglobulins (Ig). 3). Most abundant and active in fighting any foreign particle in the body (known as the 'antigen') is the simplest of immunoglobulins, the Y-shaped IgG molecule. It is made up of two 'light' and two 'heavy' polypeptide chains (socalled because of their molecular weights) held together by molecular bridges. Depending on the types and the number of chains in a molecule and their specific functions, four more types of immunoglobulins are seen in our body.

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