Out of the following, which type of interaction is responsible for the stabilisation of -helix structure of proteins?
Biomolecules · Class 12 · JEE Main Previous Year Question
Out of the following, which type of interaction is responsible for the stabilisation of -helix structure of proteins?
- a
Ionic bonding
- b✓
Hydrogen bonding
- c
Van der Waals forces
- d
Covalent bonding
Hydrogen bonding
Step 1: Understanding the Alpha-Helix — The -helix is a core element of the secondary structure of proteins, characterized by a tightly coiled backbone.
Step 2: Identifying the Stabilizing Force — This helical shape is maintained by intramolecular interactions between the amide groups ( and ) of the peptide chain.
Step 3: Conclusion — Specifically, hydrogen bonding between the of one residue and the of the fourth residue down the chain provides the necessary stability. Correct option is (b).
Remember: These hydrogen bonds are approximately parallel to the helical axis.
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