Stability of - Helix structure of proteins depends upon
Biomolecules · Class 12 · JEE Main Previous Year Question
Stability of - Helix structure of proteins depends upon
- a
Dipolar interaction
- b✓
H- bonding interaction
- c
vander Waals forces
- d
- stacking interaction
H- bonding interaction
Step 1: Helical Backbone — The -helix is a common motif in the secondary structure of many proteins.
Step 2: Stabilization Mechanism — This structure is stabilized by hydrogen bonds between the carbonyl oxygen () of one amino acid and the amino hydrogen () of the fourth residue down the chain.
Step 3: Conclusion — The intramolecular hydrogen bonding interaction (H-bonding) is the primary stabilizing force. Correct option is (b).
Key Point: Each turn of the -helix consists of approximately 3.6 amino acid residues.
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