Proteins are the most abundant organic molecules of the living system. They occur in every part of the cell and constitute about 50% of the cellular dry weight. Proteins form the structural and function of life. The biological function of a protein is due to its conformation, which is defined as the three dimensional arrangement of the atoms of a molecule. Four basic structural levels are assigned to proteins: primary, secondary, tertiary and quarternary structures. 
Protein Structure
Protein Structure
Primary Structure
1. Amino acids are joined together by peptide linkage.
2. The sequence in which the amino acids are arranged in protein is called primary structure.
Secondary Structure
1. It arises due to the regular folding of the poly peptide chain due to intermolecular hydrogen bonding between >C=O and –NH2 groups
2. The peptide chain can be coiled to form α helix structure or they can be stretched out to form β pleated structure.
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