Question

Describe the secondary structure of proteins.

Answer 1

secondary structure of proteins refers to shape in which a long polypeptide  chain exists . a protein may assume

a  Alpha- helix structure or Beta - pleated structure. The  alpha -helix structure results due to regular coiling of polypeptide chains which is stabilised by intra molecular hydrogen bonding.keratin in hair,nails,wool and myosin in nucleus have a Alpha-helix structure . In beta- pleated sheet structure, all peptide chains are strecthed to nearly maximum extension and then arranged side by side and held together by intermolecular hydrogen bonding. silk has beta-pleated structure.

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Answer 2

Protein secondary structure is the three dimensional form of local segments of proteins. The two most common secondary structural elements are alpha helices and beta sheets, though beta turns and omega loops occur as well. Secondary structure elements typically spontaneously form as an intermediate before the protein folds into its three dimensional tertiary structure.

Secondary structure is formally defined by the pattern of hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone. Secondary structure may alternatively be defined based on the regular pattern of backbone dihedral angles in a particular region of the Ramachandran plot regardless of whether it has the correct hydrogen bonds.

The concept of secondary structure was first introduced by Kaj Ulrik Linderstrom-Lang at Stanford in 1952. Other types of biopolymers such as nucleic acids also possess characteristic secondary structures.