Bonds present in various protein structures

1. Primary structure
Peptide bonds

2. Secondary Structure

Alpha helix -
Peptide bonds, Intramolecular hydrogen bonds

Beta pleated -
Peptide bonds, Intermolecular hydrogen bonds

Collagen helix -
Peptide bonds, Locking effect via proline and hydroxyproline

3. Tertiary Structure
Peptide bonds, Hydrogen bonds, Disulphide bonds, Ionic bonds, Hydrophobic interactions, Van der Waal Forces

4. Quaternary Structure
Peptide bonds, Hydrogen bonds, Hydrophobic interactions, Ionic bonds