4: Protein Structure
Protein folding, structural levels, and mechanisms.
LibreTexts reference: Proteins- Structure and Folding
Matching Protein Structure Levels to Descriptions
Click to show Matching Protein Structure Levels to Descriptions example problem
Match each of the following levels of protein structure with their corresponding descriptions.
Note: Each choice will be used exactly once.
| Your Choice | Prompt | |
|---|---|---|
| 1. quaternary | ||
| 2. primary | ||
| 3. secondary | ||
| 4. tertiary |
Drag one of the choices below:
- A. φ and ψ dihedral angles
- B. hydrophobic interactions of amino acid side chains
- C. association of two or more polypeptide chains
- D. intramolecular peptide bonds of the linear amino acid chain
Levels of Protein Structure from Descriptions
Click to show Levels of Protein Structure from Descriptions example problem
Which one of the following levels of protein structure correspond to the description 'amino acid chain length'.
Hydrogen Bonds in Alpha-Helix Structures (Matching)
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The α-helix is a right-handed coil in which each backbone N–H group forms a hydrogen bond with the C=O group of an amino acid located a few residues away. The regular pattern of hydrogen bonding stabilizes the helix, preventing it from unraveling.
In a long α-helix, amino acid number 7 would form a hydrogen bond with which two other amino acids?
Select two correct answers.
Hydrogen Bonding in Alpha-Helix Structures
Click to show Hydrogen Bonding in Alpha-Helix Structures example problem
The α-helix is a right-handed coil in which each backbone N–H group forms a hydrogen bond with the C=O group of an amino acid located a few residues away. The regular pattern of hydrogen bonding stabilizes the helix, preventing it from unraveling.
In a long α-helix, amino acid number 12 would form a hydrogen bond with which two other amino acids?
Select the correct pair of amino acids below.