General Features of Protiens

A protein is a unique three dimensional biological polymer constructed from 20 different monomers called amino acid. Some of amino acids are glycine, alanine, valine, leucine etc. There are three structural levels in the conformation of a protein called primary, secondary, and tertiary structure. Primary structure is the unique genetically coded sequence of amino acids within a protein. Amino acids are bonded by peptide bond which links the amino group of one amino acid with the …

…occurs in proteins that are composed of more than one polypeptide chain. The individual polypeptide subunits are held together in a precise structural arrangement in a super coiled form giving a particular protein its unique structure, example hemoglobin. Protein serves different function in cell such as structural support (fibers), enzymes, transporters (hemoglobin transporting Oxygen), receptor (which response to cell chemical stimulant), hormones (internal coordination),contractile protein (actins and myosin), storage protein and defense proteins (antibodies).