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Question

Explain the terms primary and secondary structure of proteins. What is the difference between α helix and β pleated sheet structure of proteins?
 


Solution

 Primary structure of proteins proteins consist of one or more polypeptide chains. Each polypeptide is a protein contains amino acids joined with each other in a specific sequence. Secondary structure of proteins it refers to the shape in which a long polypeptide chain can exist.
          αhelix structure          βpleated sheet structureA structure of twisting of all a polypeptide chainAll peptide chains are stretched out to nearlyformed by possible Hbonds into a rightmaximum extension and then laid side by sidehanded screw (helix) with theNH group ofwhich are held together by intermoleculareach amino acid, and residue hydrogenhydrogen bonds. This structure resembles thebonded to theCOof an adjacent turn ofpleated folds of the drapery. Hence, calledthe helix.Hence, called αhelix.βpleated sheet structure.


Chemistry
NCERT Exemplar
Standard XII

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