Draw a diagram of the hydrogen bonding interactions in: i) a two-stranded antiparallel beta sheet, and ii) a two-stranded parallel beta sheet (show all main chain atoms).
Secondary structure of protein: Formed due to twisting of polypeptide chain.
The folding is due to interaction between atoms and polypeptide backbone. The two common type of folding present in secondary structure are, alpha helix and beta sheet..
Alpha helix:-
Hydrogen bonding stabilizes this structure. It is formed between carbonyl(C=O) and hydrogen atom (N-H) which is four down the chain.
There are 3.6 amino acids in each helix. Except for the first and last peptide bonds all participate in hydrogen bonding. R group is projected outwards.
Beta sheet:-
Hydrogen bonding is formed between neighboring segments of polypeptide chain. Hydrogen bond is formed between amino and carbonyl groups with R-group extended above and below plane.
The strands can be parallel (same direction) or antiparallel (opposite direction).
Diagrammatic depiction:
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