Abstract
Proteins are the ambidexterity macromolecules which play a crucial role in
biological processes. Through proteins, genetic information is expressed. They exhibit
enormous functions which are crucial in various pathways. Some proteins act as an
enzyme which is vital for catalyzing various metabolic reactions in living cells. All
proteins are made up of amino acids which join together via a peptide bond to form a
polypeptide chain which is a precursor for the further development of protein. A
nascent protein undergoes several post-translational modifications to achieve its true
function. Based on the amino acids present in the protein, its function determines its
role as hormones, enzymes, antibodies, transporters, etc. In this chapter, a brief
introduction to protein’s structure and function is discussed.