Why is proline and glycine rarely found in alpha helix?
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"Glycine and Proline start secondary structures called beta turns. A beta turn is a turn in the primary structure, stabilized by hydrogen bonding. Because Proline has an odd, cyclic structure, when it forms peptide bonds, it induces a bend into the amino acid chain."
"Glycine and Proline start secondary structures called beta turns. A beta turn is a turn in the primary structure, stabilized by hydrogen bonding. Because Proline has an odd, cyclic structure, when it forms peptide bonds, it induces a bend into the amino acid chain."
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All the amino acids are found in α-helices, but glycine and proline are uncommon, as they destabilize the α-helix. Glycine is exempt from many steric constraints because it lacks a β carbon.
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