Keratin's structure is based on a complex arrangement of polypeptide chains primarily in pleated sheets.
Keratin Structure Details
Keratin, a key structural protein, is known for its robust and resilient properties. Here's a breakdown of its structure:
Key Structural Features
- Pleated Sheets: The fundamental arrangement of keratin involves peptide chains forming pleated sheets.
- Parallel and Antiparallel Arrangement: These pleated sheets are found in approximately equal proportions as both parallel and antiparallel configurations.
- Hydrogen Bonds: The peptide chains within the sheets are connected by hydrogen bonds. These bonds form between the carbonyl (C=O) and imino (N-H) groups along the polypeptide backbone.
Summary in Table Format
| Feature | Description |
|---|---|
| Primary Structure | Sequence of amino acids in the polypeptide chain. |
| Secondary Structure | Predominantly pleated sheets (parallel and antiparallel). |
| Bonding | Hydrogen bonds between carbonyl and imino groups stabilize the sheet structure. |
Importance of Hydrogen Bonds
Hydrogen bonds are crucial in stabilizing the pleated sheet structure of keratin. These bonds, while individually weak, collectively provide significant structural integrity and contribute to the overall strength and flexibility of keratin.
Practical Example
Think of the keratin in your fingernails and hair. The pleated sheet arrangement contributes to their strength and resilience, allowing them to withstand wear and tear.
