A D amino acid would interrupt an alpha-helix made of L-amino acids. Another naturally occurring hindrance...
A D amino acid would interrupt an alpha-helix made of L-amino acids. Another naturally occurring hindrance to the formation of an alpha-helix is the presence of:
a. a nonpolar residue near the carboxyl terminus
b. a negatively charged Arg residue
c. a positively charged Lys residue
d. two Ala residues side by side
e. a Pro residue
Can someone please explain why the answer is E.
Homework Answers
Solution: Option E
The stability of secondary structure of protein is due to the presence of hydrogen bonding. The hydrogen bonding stablizes the alpha helices in secondary structure. Simple amino acids (like alanine) are favourable for the formation of alpha helices by hydrogen bonds between peptides.
Proline is a cyclic amino acid, therefore it is not able to form hydrogen bonds with peptides hence, tends to disrupts the alpha helices. Thus, the presence of pro-residue into the interior of proteins destablises the alpha-helix.
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